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TURNSTONE RESOURCES LTD — Capital/Financing Update 2020
Sep 22, 2020
65958_rns_2020-09-22_913cfe46-300c-4813-b218-dae141f1cfd9.pdf
Capital/Financing Update
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ASX ANNOUNCEMENT 23[rd] September 2020
DAVENPORT ANNOUNCES MAJOR SULPHATE DISCOVERY AT GERMAN LICENCE AREA
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Davenport announces JORC (2012) compliant inferred resource at Nohra-Elende, comprising 768Mt at an average grade of 8.1% magnesium sulphate, with intersections up to 20%.
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Magnesium sulphate is contained within the mineral kieserite (MgSO4.H2O) of which 72Mt has been identified.
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The kieserite resource was estimated from the database of over 300 drillholes acquired from the German government at time of purchasing the perpetual mining licences. Ninety-two drillholes have been sunk in and around the Nohra-Elende licence area.
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Natural kieserite is mined in Germany, however ore reserves are depleting and a replacement source is required. The only other significant source is China, where magnesium sulphate is manufactured synthetically in a process using hot acids.
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Magnesium sulphate can be sold in a pure form, blended with potash (MOP) to produce value-added fertilizers or reacted with MOP to manufacture potassium sulphate (SOP).
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Nohra-Elende offers a diversified basket of pure and value-added fertiliser products well-suited to the European market and favourably located.
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Micon International Co. Limited (“ Micon ”), Davenport’s independent competent person (“ CP ”) for mineral resource estimation, calculated the Nohra-Elende inferred resource.
Davenport Resources Ltd (ASX: DAV, “ Davenpor t”, “ The Company ”) is pleased to announce a maiden JORC-compliant inferred kieserite resource for the northern part of its Nohra-Elende project totalling 768 million tonnes grading an average of 8.1% magnesium sulphate (predominantly in the form of the mineral “kieserite”), but increasing to 20% in places. The resource was confirmed by renowned consultancy group Micon International Co Limited based on available historic exploration data.
The resource area contains approximately 72 million tonnes of kieserite (MgSO4.H2O), which is a valuable fertiliser nutrient. It provides a source of both readily water-soluble magnesium and sulphur, which are commonly depleted from soils in Europe and around the world.
The kieserite resource is present within the carnallitite and sylvinite potash seams that were evaluated by Micon in late 2018 ( ASX announcement 13[th] November 2018 ). In addition to the 72Mt kieserite resource, the entire Nohra-Elende potash deposit comprises sylvinite and carnallitite, containing more than 165 million tonnes of potentially exploitable K2O resources.
Kieserite is marketed globally and produced in three major forms, depending on the water content. The most common form, used predominantly in agriculture, is magnesium heptahydrate (Epsom Salt). The European market for magnesium sulphate products derived from kieserite is approximately 300,000 tonnes per annum,
Level 1, 675 Murray Street, CONTACT DETAILS ABN: 64 153 414 852 West Perth WA 6005 W: davenportresources.com.au ASX Code: DAV PO Box 1088 - E: [email protected] ASX Code (Options): DAVO West Perth WA 6872 P: +61 (08) 9481 0389 Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
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however, kieserite is also used in combination with MOP to produce higher value K+Mg fertilisers and is also used to convert MOP to the premium SOP fertiliser, the latter having a 6 Mt global market
Natural kieserite is already mined in Germany, however ore reserves are depleting and a replacement source will be required. Palm oil producers in SE Asia use large volumes of magnesium sulphate sourced from product manufactured synthetically through a chemical process using hot acids.
Davenport Managing Director Dr Chris Gilchrist said:
“This newly identified kieserite resource establishes the potential to produce significant amounts of attractively priced magnesium sulphate salts in addition to muriate of potash (MOP) from the Nohra-Elende deposit. The global magnesium sulphate market is increasing rapidly as farmers are recognising the importance of these nutrients. We believe the Nohra-Elende project may have potential to support a large, long-life mine which together with our other growth options, will contribute to Davenport developing into a world-class producer of both conventional and specialty fertiliser products and in particular, become a major supplier in Europe.”
Nohra-Elende is one of at least four standalone projects in Davenport’s portfolio, which comprises western Europe’s largest potash inventory of more than 5.3 billion tonnes of potash. Davenport is working to develop its project portfolio.
In accordance with ASX listing rule 5.23, the Company is not aware of any new information or data that materially affects the information included in the previous market announcement ( ASX announcement 13[th] November 2018) and that all material assumptions and technical parameters underpinning the estimate in the previous market announcement continue to apply and have not materially changed.
Next Steps
Davenport intends to continue with its strategy to sink two twin, confirmatory drillholes at its Ohmgebirge (MOP) project in order to upgrade the current inferred resources to the indicated category, following which the existing scoping study will be upgraded to a feasibility study during next year. In parallel with this, as a consequence of the kieserite discovery, Davenport will conduct further studies on the production cost and market potential for SOP, magnesium sulphate and specialty K+Mg fertiliser blends.
Investor & Media Enquiries
Dr Chris Gilchrist Nathan Ryan Managing Director Managing Director Davenport Resources Ltd NWR Communications +353 41 988 3409 +61 420 582 887 [email protected] [email protected]
Level 1, 675 Murray Street, CONTACT DETAILS West Perth WA 6005 W: davenportresources.com.au PO Box 1088 - E: [email protected] West Perth WA 6872 P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
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Project Location
The Nohra-Elende project is located near Nordhausen in the state of Thüringia in Germany. The project area comprises the northern part of the Mühlhausen-Nohra mining licence, approximately 30km northwest of the state’s capital city Erfurt, and at the south-western boundary of the South Harz Potash District.
Mühlhausen-Nohra is one of three perpetual mining licences in the South Harz Basin that Davenport acquired from the German Federal Government agency Bodenverwertungs-und-verwaltungs GmbH (“ BVVG ”), (Figure 1). The remaining two perpetual mining licences are Ebeleben and Ohmgebirge. Küllstedt and Gräfentonna are exploration licence areas held by the Company.
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Figure 1: Location of Davenport’s South Hartz Potash Projects.
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
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Exploration and drill hole database
All exploration drilling conducted on the Mühlhausen-Nohra mining licence is historical. The first evidence of exploration is from drillhole Kal Möhrbach 1/1890 which dates back to 1889. The majority of the historical exploration drilling on the Mühlhausen-Nohra mining licence was conducted by the former German Democratic Republic (GDR) during two major campaigns, one in the 1960s and one in the 1970/80s. Various state institutions were involved during these campaigns, which were later merged after reunification to form the VEB Kombinant.
The drill hole database for the Nohra-Elende sub-area consists of 92 drill holes, 28 within the licence and 64 adjacent to the licence. Of these 92 drill holes, four were hydrocarbon exploration drill holes and 88 potash exploration drill holes, with 32 drill holes providing mineralogical information and 25 intersecting kieserite. All drill holes were drilled vertically with minor deviations in some drill holes at depth. Drilling from surface used tricone bits through the overburden and upper stratigraphy, switching to core through the potash-bearing horizons to the end of hole (EOH). Clay mud was used as the drilling fluid through the overburden sections in potash drill holes and a NaCl-saturated drilling fluid was used through the salt horizons. Casing was used through the overburden.
The database compiled in 2018 was used as the basis for the kieserite modelling. When originally creating the database, Micon manually entered the chemical and mineralogical information recorded on historical assay logs. The data that featured on the logs comprised a breakdown of the chemical analysis for each sample that was subsequently used to calculate the mineral content of each sample. In order to model the kieserite and other sulphate minerals on the Nohra-Elende sub-area, Micon revisited the database compiled in 2018 and added any additional chemistry and mineralogical data to ensure as much information on the varying mineralogy was available for modelling.
The chemical database used for the kieserite model includes data for 43 drillholes, of which 12 (including four hydrocarbon drill holes) are missing mineralogical information as only the K2O content can be located in the historical records. To quantify the amount of chemical and mineralogical data available for each sample, the sum of the chemical results and the sum of the mineralogical allocations was calculated. Each of these respective checks should have a total sum of 100% if the data is complete. As expected because of the historical nature of the data, not all the samples contained 100% chemical and/or mineralogical data. Instead of inserting dummy values to account for these gaps, Micon elected to apply a filter to the data when modelling to exclude any samples with less than 90% total chemical data.
All drill holes with verified downhole chemistry data were relied upon for geological modelling and estimation purposes. In instances where full drill hole logs were available, these typically included a detailed lithological description of the entire drill hole, a summarised stratigraphic log, graphically-displayed downhole geophysical log and the chemistry and mineralogy results.
All drill hole sampling was conducted according to the procedures and protocols as specified in KaliInstruktion (1956 and 1960)[1] . Drill core samples were collected from all the potash drill holes. Where possible, the K2O grade of the potash-bearing horizons was historically determined on an empirical base using the correlation with the downhole natural gamma log. Samples were collected across all potashbearing horizons and the total sampled length represents the total thickness of the potash-bearing horizon of the z2KSt. In the potash drill holes, core sample thicknesses ranged from 0.07m to 25m. Over inhomogeneous potash horizons where interlayers of potential waste were included, the minimum sample thickness was 0.5m and the maximum 5m. Samples were crushed to 2mm in a jaw crusher and a representative sample was milled and crushed further to 50μm. A sub-sample was assayed by ICP-OES for all elements except NaCl, which was analysed using potentiometric titration. XRD was used for mineralogical analysis and thin section microscopy was carried out at a local university.
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
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Figure 2: Nohra-Elende sub-area showing historic drillhole locations, extent of kieserite resource area (hatched red), former potash mines and location of historic shafts.
Geology and Modelling
The Südharz (South Harz) Potash District, located in the north-western extent of the Thüringian sedimentary basin, forms part of the South Permian Basin of the ancient Zechstein Sea. This covers an area extending from England to eastern Poland with flanking areas within Denmark and the South Baltic Sea in the north and the upland regions of Belgium and Germany to the south.
Level 1, 675 Murray Street, CONTACT DETAILS ABN: 64 153 414 852 197.1 M Ordinary Shares West Perth WA 6005 W: davenportresources.com.au ASX Code: DAV 14.2 M Unlisted Options PO Box 1088 - E: [email protected] ASX Code (Options): DAVO 46.2 M Listed Options West Perth WA 6872 P: +61 (08) 9481 0389 Frankfurt Code: A2DWXX 5.9M Performance Rights
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The regional stratigraphy of the South Permian Basin is well understood with a pre-Variscan basement (Upper Carboniferous and older rocks) and a transition horizon of Upper Carboniferous to Lower Permian lying beneath an expansive sequence of evaporite rocks of the Upper Permian succession. These evaporite deposits are assigned to the Zechstein Group, and host the target potash mineralisation of the South Harz Potash District, along with other potash deposits in Germany, France and the United Kingdom, including the Woodsmith and Boulby Polyhalite mines.
In the Mühlhausen-Nohra mining licence area, the potash-bearing horizon known as the z2KSt is present throughout the extent of the mining licence and has an average thickness of 18.2m across the northerly Nohra-Elende sub area. Generally, in the Nohra-Elende project area, the deposit bedding is assumed to be undulating with an even dip over large distances. Local differences may occur in areas influenced by tectonic structures and a potential west-east fault has been identified on Nohra-Elende with a ± 100m displacement. The minimum depth from surface to the roof of the Main Seam is ± 405m and the average depth is ± 560m.
The main minerals present are carnallite and sylvite with lesser amounts of halite, kieserite, polyhalite, anhydrite, langbeinite, kainite, aphthitalite and syngenite. The 2018 Nohra-Elende database and model has been updated by Micon to produce a block model containing data from the broader mineralogy of the potash seam, with a specific focus on the kieserite content.
The 2020 Micon chemical database, once validated, was composited down-hole into 5m widths so that the sampling data was evenly distributed for input into the block model. The Upper Sylvinite and Carnallitite wireframes from the 2018 modelling were combined to make one solid wireframe called the Main Seam. This was then clipped to the extents of the kieserite area using a polygon that was digitised based on kieserite intersections with a mineral content of > 2%.
The Main Seam kieserite wireframe and results of the geostatistical analysis were used to create a block model of the Nohra-Elende sub area. The whole of the potash resources on Nohra-Elende cover an area slightly larger than that included in the kieserite model (Figure 2). The total potash resources were reported in 2018, and the mineral resources reported resulting from the kieserite modelling are inclusive of the 2018 resources and should not be considered as additional tonnes.
A 3D block model estimate was carried out using Ordinary Kriging (OK). The kriging method was set to ordinary to ensure that the local mean was recalculated each time the search neighbourhood was positioned on a new block centroid. The 5m downhole composited database was used to estimate chemical grades and mineral contents into the block with sample data within the kieserite wireframe flagged and a filter applied to the sum of the chemical elements so that only those samples with results > 90% were used to estimate grade.
Search ellipse dimensions were based on the drill hole distribution and variography. All estimated elements and minerals had a primary search ellipse radius of 1,300m to ensure coverage between drill holes. The search ellipse was divided into eight sectors with a maximum number of three points per sector. A maximum count per reference of three was applied to limit the number of samples used in each drill hole.
Since the potash mineralisation is relatively horizontal, the rotation mode was used for the search ellipse where only the azimuth and plunge are required. The ellipsoid axes for both K2O and kieserite were set as follows: -
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Major Axis (X) = 180 azimuth 0 plunge;
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Semi-major Axis (Y) = 90 azimuth 0 plunge; and,
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Minor Axis (Z) = 0 azimuth 0 plunge
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
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The two modelled variograms were used to model the elements and mineralogy where the most relevant variogram, either K2O or kieserite, was used. Grade was estimated into parent blocks and all sub-blocks received the same grade as their relevant parent block.
Mineral Resources
When Micon modelled the Nohra-Elende sub-area in 2018 the focus was on the carnallitite and sylvinite resources. ( ASX announcement 13[th] November 2018) . However, during modelling it became apparent that there were significant amounts of sulphate minerals present as well as carnallite and sylvite. The most prominent of the sulphate minerals is kieserite, which can be sold as magnesium sulphate in various hydration states. Therefore the 2018 Nohra-Elende model has been updated by Micon to produce a block model that contains data concerning the broader mineralogy of the potash seams, with a specific focus on the kieserite content.
With the exception of a zone of halite in the north-east of Nohra-Elende, the 2018 resource work confirmed that the economic potash deposit extends across the whole of the sub-area and is known from additional drill holes to extend beyond the Davenport mining licence boundary. However, kieserite mineralisation does not occur across the whole of Nohra-Elende and the extents of kieserite mineralisation were defined based on a > 2% mineral content (Figure 2).
The 2018 mineral resources ( ASX announcement 13[th] November 2018) were restricted by a total seam thickness (>1 m), grade (>5% K2O) and the licence area boundary. The same parameters were used by Micon for the 2020 kieserite model with the addition of the model area being restricted to the kieserite polygon.
The average thicknesses of the wireframes, for the 2018 model are Upper Sylvinite seam 1.78 m, Carnallitite Seam 26.06 m and Lower Sylvinite seam 1.99 m. The average thickness for the 2020 kieserite Main Seam wireframe is 30.6 m.
The total mineral resource area for the Kieserite Project within the Nohra-Elende sub-area is approximately 18.7 km[2] and the total Inferred Mineral Resources tonnage is 768 Mt including 72 Mt of kieserite at a grade of 9.45% K2O and 8.1% MgSO4 (Table 1). This mineral resource estimate does not include the previously estimated Lower Sylvinite Seam, which adds an additional 14 Mt to the total resources on Nohra-Elende at an average grade of 10.67% K2O. Total mineral resources per licence area are shown in Figure 3.
Inferred Mineral Resource Estimate for the Kieserite Area of the Nohra-Elende Sub-Area of the Mühlhausen-Nohra Mining Licence (Micon, 31[st] August 2020)
| Seam | Bulk Density **(t/m3) ** |
Tonnage (Mt) |
Geol |
Inferred |
**K2O ** | **K2O ** | MgSO4 | Kieserite | Anhydrite | Polyhalite | Carnallite | Sylvite (Mt) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Loss (%) |
Tonnage (Mt) |
(%) | (Mt) | (%) | (Mt) | (Mt) | (Mt) | (Mt) | ||||
| Main Seam (Full) | 1.90 | 960 | 20 | 768 | 9.45 | 73 | 8.1 | 72 | 27 | 1 | 384 | 11 |
| Total Main Seam Nohra-Elende |
1.90 | 960 | 20 | 768 | 9.45 | 73 | 8.1 | 72 | 27 | 1 | 384 | 11 |
Notes:
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Main Seam is a combination of the Upper Sylvinite and Carnallitite Seams (predominantly made up of Carnallitite). 2. Minimum seam thickness considered for resources is 1 m.
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Minimum cut-off grade ≥5% K2O.
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20% geological loss applied to account for potential unknown geological losses for Inferred Resources.
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Data source: historical state records (BVVG) checked and verified.
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Inferred Resources rounded down to nearest 100,000 t.
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Errors may exist due to rounding.
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
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Figure 3: All JORC resource areas under Davenport’s control in the South Harz Potash District. The kieserite resource is located in the northern part of the Nohra-Elende sub-area.
Ongoing & Future Work
Work is continuing in Germany to fully evaluate the projects under Davenport’s control. The next phase is to upgrade the existing JORC 2012 Inferred resources from Ohmgebirge to Indicated resources through the completion, subject to funding, of approximately two twin drillholes. Davenport has selected drill sites for the two drillholes and work will shortly commence to obtain the required drilling permissions.
Following an upgrade of the resources, Davenport will further de-risk the Ohmgebirge project and increase the level of definition through a feasibility study to fully evaluate its technical and economic potential.
Level 1, 675 Murray Street, CONTACT DETAILS ABN: 64 153 414 852 197.1 M Ordinary Shares West Perth WA 6005 W: davenportresources.com.au ASX Code: DAV 14.2 M Unlisted Options PO Box 1088 - E: [email protected] ASX Code (Options): DAVO 46.2 M Listed Options West Perth WA 6872 P: +61 (08) 9481 0389 Frankfurt Code: A2DWXX 5.9M Performance Rights
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In parallel with this, as a consequence of the significant kieserite discovery, Davenport will conduct further studies on the production cost and market potential for SOP, magnesium sulphate and specialty K+Mg fertiliser blends.
This announcement has been approved by the Board of Directors of Davenport Resources Limited.
Competent Person Statement
Elizabeth de Klerk M.Sc., Pr.Sci.Nat., SAIMM., Micon’s Senior Geologist and Competent Person visited the South Harz Potash project on three separate occasions, from the 12[th] to 16[th] February, the 6[th] to 8[th] March 2018 and again from 15[th] to 17[th] October 2019. During the initial site visit the South Harz Potash Project and laboratory facilities at K-UTECAG Salt Technologies (K-UTEC) in Sondershausen were visited. The original hard copy drill hole logs, reports, maps and cross-sections held by the Bodenverwertungs und verwaltungs GmbH (BVVG) archives in Berlin were inspected. In addition, Mrs. de Klerk had discussions with Ercosplan in Erfurt in order to understand how the data was captured and structured in an Excel database from which Ercosplan estimated Exploration Targets for the various Davenport licences of the South Harz Potash Project. The second site visit involved additional time being spent at K-UTEC inspecting additional historical records for the South Harz Potash Project held in the K-UTEC archives at its head office in Sondershausen. During the third visit, Mrs. de Klerk visited the Ohmgebirge mining licence area as well as the K-UTEC archives and the surrounding dormant mining areas.
References
1. ‘ Kali-Instruktion - Instruktion zur Anwendung der Klassifikation der Lagerstättenvorräte fester mineralischer Rohstoffe vom. 28 August 1979 auf Kalisalz- und Steinsalzlagerstätten, Prof. Dr W Gotte, Akademie-Verlag Berlin, Zeitschrift für angewandte Geologie, Bd. 28 (1982), Heft 6, p287 - 293.
Level 1, 675 Murray Street, CONTACT DETAILS West Perth WA 6005 W: davenportresources.com.au PO Box 1088 - E: [email protected] West Perth WA 6872 P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
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ABOUT KIESERITE AND THE IMPORTANCE OF MAGNESIUM
INTRODUCTION
Magnesium sulphate is commercially available as heptahydrate, monohydrate, anhydrous or dried form containing the equivalent of 2 - 3 waters of hydration. Magnesium sulphate occurs naturally in seawater, mineral springs and in minerals such as kieserite and epsomite. Magnesium sulphate heptahydrate is manufactured by dissolution of kieserite in water and subsequent crystallization of the heptahydrate. Magnesium sulphate is also prepared by sulphation of magnesium oxide. It is produced with one or seven molecules of water of hydration or in a dried form containing the equivalent of about 2 - 3 waters of hydration. Magnesium sulphate is available as brilliant colourless crystals, granular crystalline powder or white powder with a bitter salty, cooling taste. It is freely soluble in water, very soluble in boiling water, and sparingly soluble in alcohol. Magnesium sulphate is used as a fertiliser nutrient, firming agent and flavour enhancer. It is also used as a fermentation aid in the processing of beer and malt beverages. No food uses have been identified for the anhydrous form of magnesium sulphate.
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There is an estimated 7.5m tpa capacity of MgSO4 globally with K+S the market leader with approx. 3m tpa reported capacity, however there is only an estimated 1.6m tpa consumption in the pure form. The Heptahydrate form currently represents about 65% market share to the more premium Anhydrous & Monohydrate grades available. More importantly, magnesium sulphate derived from kieserite is used to produce value-added K+Mg fertiliser blends and SOP.
Europe is a relatively small but important market for MgSO4 (Magnesium Sulphate), with just over 300k tpa sold in the pure form, however fertilizer manufacturers are looking increasingly at magnesium and sulphur additives to correct soil deficiencies in certain areas, especially where the bedrock underlying the soil does not contain any soluble magnesium or sulphur.
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
MARKET OVERVIEW
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STRUCTURE – 3 main grades
Heptahydrate – low analysis, cheapest, big in agriculture Anhydrous – Used for Pulp + Paper & many other industry uses
Monohydrate - Ultra high purity or standard high purity, submicron and nano-powder forms. Uses - Food, Agricultural and Pharmaceutical Grade; Optical Grade, USP and EP/BP (European Pharmacopoeia/British Pharmacopoeia).
MgSO4 is sold in 3 main grades, Heptahydrate has the largest market share with 65% Agricultural sector accounting for 45-50% market share. Known in the agri market as Kieserite, K+S Germany dominate the market and have a well-structured pricing strategy, complementing their MOP and salt sales. In addition to K+S production in Germany, there is a significant amount of synthetic kieserite from China today at aggressive prices.
Prices have a wide range depending how water soluble the product is, for example in China many 25% MgO grades only have a water solubility of 20% MgO and sometimes lower. Buyers have got wise to this and only pay for the water soluble content. This has also held back Chinese development as the products historically did not perform very well compared to the K+S water soluble 25% MgO product.
Kieserite today is sold in the UK for around US$240-$250/mt Bulk CFR. Monohydrate and Anhydrous forms currently average $400 to $500 per tonne respectively.
Uses of Magnesium Sulphate
Agriculture Food & Feed Additives Pharmaceuticals & Personal care Chemicals (Including Water Treatment) Pulp & Paper manufacture Rubber processing
Anhydrous magnesium sulphate cannot be prepared by crystallisation from aqueous solution, but only by dehydration of a hydrate. Aqueous solutions of salt may be prepared by dissolving the oxide, hydroxide or carbonate in sulphuric acid or by passing sulphur dioxide into a slurry of magnesium hydroxide to form the soluble bisulphide, followed by air oxidation. Magnesium sulphate can be obtained from brines,
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
197.1 M Ordinary Shares 14.2 M Unlisted Options 46.2 M Listed Options 5.9M Performance Rights
Level 1, 675 Murray Street, West Perth WA 6005 PO Box 1088 - West Perth WA 6872
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in addition to ores such as Kieserite (MgSO4.H2O), epsomite, kainite and langbeinite.
Technical grade Espom salt is made by reacting magnesium oxide, hydroxide or carbonate and sulphuric acid followed by crystallisation. USP grades are prepared similarly except for the use of higher purity magnesium compounds and the removal of iron, aluminium and other impurities by precipitation using excess MgO. Filtrate is then evaporated and the Epsom salt crystallised and washed free of mother liquor.
Magnesium Sulphate’s use in the pharmaceutical industry is likely to create new prospects for the market growth. K+S not only produces magnesium in Germany, they also own 100% of K+S (Huludao) Magnesium Products Co. Ltd in China.
Crop Requirement
Magnesium is a key component of chlorophyll, the green colouring material in plants, and is vital for photosynthesis.
Sulphur is a constituent of amino acids in plant proteins and is involved in energy-producing processes in plants.
Less soluble minerals such as Polyhalite K2Ca2Mg(SO4)4·2H2O are marketed as sources of replacement sulphur and potassium, however the dissolution kinetics are slower and much of the sulphur remains bound to the sparingly insoluble calcium sulphate within the mineral, thus a high percentage of the mineral is relatively inactive.
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Magnesium deficiency in Winter Wheat ( Source: K+S Brochure “Strong Minerals”)
CONTACT DETAILS W: davenportresources.com.au E: [email protected] P: +61 (08) 9481 0389
ABN: 64 153 414 852 ASX Code: DAV ASX Code (Options): DAVO Frankfurt Code: A2DWXX
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Page 1 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource.
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JORC Code, 2012 Edition – Table 1
Kieserite Potential of the Nohra‐Elende Sub‐Area, Mühlhausen‐Nohra Mining License Davenport Resources Ltd
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 1: Drill Hole Plan of the Nohra‐Elende and Mühlhausen‐Keula Sub‐Areas of the Mühlhausen‐Nohra Mining Licence
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 2: NW‐SE Cross‐Section through the Main Seam Wireframe
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 3: Drill Hole Plan and 2018 Wireframes of the Nohra‐Elende Sub‐Area
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 4: Interpreted fault zones on the Nohra‐Elende Sub‐Area
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 5: Drill Hole Plan Showing the Kieserite Area
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 6: Consolidated Main Seam 2020 Wireframe and Kieserite Content
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 7: Plan Map of the Kieserite Block Model
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 8: 3D Rotation of the K2O Block Model
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 9: West‐East Cross‐Section
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 10: North‐Northwest South‐Southeast Cross‐Section
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Figure 11: Planned twin drilling on Nohra‐Elende
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Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Section 1 Sampling Techniques and Data
(Criteria in this section apply to all succeeding sections.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Sampling techniques |
Nature and quality of sampling (eg cut channels, random chips, or specific specialised industry standard measurement tools appropriate to the minerals under investigation, such as down hole gamma sondes, or handheld XRF instruments, etc). These examples should not be taken as limiting the broad meaning of sampling. |
All samples were taken during historical drilling campaigns predominantly carried out during the 1960's and 1970's with eight holes drilled in the 1980’s and an additional 20 drill holes drilled between 1890‐1909 most of which were stopped before intersecting the z2KSt horizon. Sample data exists from three hydrocarbon drill holes that were geophysically logged and 35 diamond core drill holes ('potash drill holes') that produced core samples. |
| Include reference to measures taken to ensure sample retrospectivity and the appropriate calibration of any measurement tools or systems used. |
Information about the calibration of the geophysical downhole tools is not available. Core recovery logs were kept for the core drill holes, showing measurements taken by the drillers and geologists, which were checked and correct against the geophysical logs. |
|
| Aspects of the determination of mineralisation that are Material to the Public Report. In cases where ‘industry standard’ work has been done this would be relatively simple (eg ‘reverse circulation drilling was used to obtain 1 m samples from which 3 kg was pulverised to produce a 30 g charge for fire assay’). In other cases more explanation may be required, such as where there is coarse gold that has inherent sampling problems. Unusual commodities or mineralisation types (eg submarine nodules) may |
All drill hole sampling was conducted according to the Kali‐Instruktion (1956 and 1960). No core samples were taken from the hydrocarbon drill holes. Core samples were taken from 35 of the potash drill holes. Where possible, the K2O grade of the potash‐bearing horizons was determined on an empirical base using the correlation with the downhole natural gamma log. Samples were taken across all potash‐bearing horizons and the total sampled length represents the total thickness of the potash‐bearing horizon of the z2KSt. In the potash drill holes, core sample thickness ranges from 0.18 m to 4.00 m. Over inhomogeneous potash horizons where interlayers of potential waste were included, the minimum sample thickness was 0.5 m and the maximum was 5 m. Samples were crushed to 2 mm in a jaw crusher and a representative sample was milled and crushed further to 50 μm which was assayed by Induced Coupled Plasma Optical Omission Spectrometry (ICP‐OES) for all elements except NaCl which was tested using potentiometric titration. X‐RayDiffraction(XRD)was |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| warrant disclosure of detailed information. |
used for mineralogy and thin sections were carried out at a local university. |
|
|---|---|---|
| Drilling techniques |
Drill type (eg core, reverse circulation, open‐hole hammer, rotary air blast, auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard tube, depth of diamond tails, face‐sampling bit or other type, whether core is oriented and if so, by what method, etc). |
The cored potash drill holes were drilled using a Type C 1500 rig in the 1960s, and T50A and Sif 1200 rigs in the 1980s producing core with diameters of 108 mm and 65 mm respectively. The hydrocarbon drill holes were drilled using T‐50, BU‐40 and BU‐75 rigs producing core with diameters of 114 mm, 118 mm, 143 mm and 193 mm. All drill holes were drilled vertically with minor deviations in some drill holes at depth. Drilling from surface used tricone bits through the overburden and upper stratigraphy, switching to core through the potash‐bearing horizons to the end of hole (EOH). Clay mud was used as the drilling fluid through the overburden sections in potash drill holes and a NaCl‐saturated drilling fluid was used through the salt horizons. Casing was used through the overburden. |
| Drill sample recovery |
Method of recording and assessing core and chip sample recoveries and results assessed. |
It is apparent that the core recovery was monitored by the project geologist on site at the time of drilling and this is recorded in the historical logs. From the data available, which is not easily interpreted, the core recoveries appear satisfactory (approx. 97%). Lithological and stratigraphic intersections were subsequently corrected using the geophysical logging results. |
| Measures taken to maximise sample recovery and ensure representative nature of the samples. |
Information about maximising sample recovery is not currently known, but may be available in historical German documents. |
|
| Whether a relationship exists between sample recovery and grade and whether sample bias may have occurred due to preferential loss/gain of fine/coarse material. |
Sampling was conducted according to the stratigraphic interpretation of the core using the downhole geophysical logging as a depth guide. Axial drilling into the drill core with a spiral drill was conducted to contain pulverised material for chemical and mineralogical analysis. |
|
| Logging | Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, |
Core samples were geologically logged in detail and full and summary drill hole logs were produced in both written and graphical format. Information recorded on the drill hole logs included lithological depths, stratigraphic interpretation, and sampling information. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| mining studies and metallurgical studies. |
||
|---|---|---|
| Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography. |
Full drill hole logs include a detailed lithological description of the entire drill hole, which was also summarised and graphically portrayed alongside the downhole geophysical logging and assay results. Logs are available for 58 drill holes and geophysical logs are available for 15 drill holes, mostly made up of calliper and natural gamma with the full suite of geophysical results available for at least two drill holes. Geophysical logging speed is recorded as 2.5 m/min and 7 m/min. 32 drill holes have mineralogical information and 25 intersected kieserite. |
|
| The total length and percentage of the relevant intersections logged. |
The complete core intersection was logged on a millimetre scale. |
|
| Sub‐ sampling techniques and sample preparation |
If core, whether cut or sawn and whether quarter, half or all core taken. |
Axial drilling into the drill core with a spiral drill was conducted to obtain pulverised material for chemical and mineralogical analysis. |
| If non‐core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. |
Not applicable. | |
| For all sample types, the nature, quality and appropriateness of the sample preparation technique. |
All drill‐hole sampling was conducted according to the Kali‐Instruktion (1956 and 1960). |
|
| Quality control procedures adopted for all sub‐sampling stages to maximise representivity of samples. |
Samples were homogenised to ensure a representative sample was assayed (see section above on sampling). |
|
| Measures taken to ensure that the sampling is representative of the in situ material collected, including for instance results for field duplicate/second‐half sampling. |
No field duplicates were taken. Thicknesses of the potash‐bearing horizons were confirmed by the geophysical logging and the full length of the potash was sampled. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Whether sample sizes are appropriate to the grain size of the material being sampled. |
Sample sizes are considered appropriate to the material being sampled, which is bulk mineralisation. |
|
|---|---|---|
| Quality of assay data and laboratory tests |
The nature, quality and appropriateness of the assaying and laboratory procedures used and whether the technique is considered partial or total. |
Samples were sent to the VEB Kombinat Foundation of Potash Research Institute, now known as K‐UTEC AG Salt Technologies. Samples were assayed by ICP‐ OES for all elements except NaCl which was tested using potentiometric titration. |
| For geophysical tools, spectrometers, handheld XRF instruments, etc, the parameters used in determining the analysis including instrument make and model, reading times, calibrations factors applied and their derivation, etc. |
This information is not currently known, but may be available in untranslated historical German documents. |
|
| Nature of quality control procedures adopted (eg standards, blanks, duplicates, external laboratory checks) and whether acceptable levels of accuracy (ie lack of bias) and precision have been established. |
Quality control was insured by technical representatives from several state institutions at the time who checked the sampling procedures and laboratory results. |
|
| Verification of sampling and assaying |
The verification of significant intersections by either independent or alternative company personnel. |
For all exploration work conducted post‐1950, quality assurance and quality control (QAQC) procedures performed at Mühlhausen‐Nohra was conducted by independent state institutions and quality checked by VEB Kombinat Kali company professionals. Detailed information regarding the cross‐check analysis that is reported to have occurred on the Mühlhausen drill‐ hole data is not currently available to Micon and may exist in the archives in Germany. |
| The use of twinned holes. | No twin drilling has taken place. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. |
Original drill‐hole logs were recorded on paper, using a combination of handwritten and typed records. Copies of the drill‐hole logs (including the summary logs and geophysical logging etc) were distributed to several institutions around Germany, including BVVG, Ercosplan and K‐UTEC, many of which are still stored in the archives and available for review. The header for each drill‐hole lists have not all been located, but those that are have been were reviewed in person by Micon and Davenport. No original drill core or sample pulps are still available. |
|
|---|---|---|
| Discuss any adjustment to assay data. |
Assay data was not adjusted in any way. K2O grades for the hydrocarbon drill holes were interpreted from the natural gamma logs. |
|
| Location of data points |
Accuracy and quality of surveys used to locate drill holes (collar and down‐hole surveys), trenches, mine workings and other locations used in Mineral Resource estimation. |
Drill‐hole collars were surveyed by the state surveyor subsequent to drilling and given with centimetre to decimetre accuracy. Records of collar positions were obtained from drill‐hole logs and state archives. |
| Specification of the grid system used. |
Drill‐hole coordinates were recorded in local a German coordinate system, which is a 3‐degree Gaus Kruger zone 4 projection with a DHDN datum and an East Germany local transformation to 2 m (EPSG‐Code 31, 468). For the purposes of this resource estimation the coordinates have been converted to UTM Zone 32 North. |
|
| Quality and adequacy of topographic control. |
No topographic survey exists for the project area, which is flat lying to gently undulating. |
|
| Data spacing and distribution |
Data spacing for reporting of Exploration Results. |
The drill‐hole spacing in the Nohra‐Elende sub‐area ranges from ±400 m to ±2,800 m. The average drill hole spacing within the kieserite polygon is 1,100 m |
| Whether the data spacing and distribution is sufficient to establish the degree of geological and grade continuity appropriate for the Mineral Resource and Ore Reserve estimation procedure(s) and classifications applied. |
The spacing of drill holes and samples is considered sufficient to imply geological and grade continuity based on information obtained from historical drill holes and samples. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Whether sample compositing has been applied. |
Samples were not composited prior to laboratory test work. |
|
|---|---|---|
| Orientation of data in relation to geological structure |
Whether the orientation of sampling achieves unbiased sampling of possible structures and the extent to which this is known, considering the deposit type. |
All drill holes are vertical with only minor deviations at depth as discussed above. The potash‐bearing horizons are horizontal with only minor gentle undulations and the sample thicknesses are considered to represent true thickness without requiring correction. |
| If the relationship between the drilling orientation and the orientation of key mineralised structures is considered to have introduced a sampling bias, this should be assessed and reported if material. |
The potash seam at Nohra‐Elende is horizontal to sub‐ horizontal and all thicknesses from the vertical drill holes have been treated as true thickness. |
|
| Sample security |
The measures taken to ensure sample security. |
No information is available about sample security, although it is noted that the historical drilling programmes were conducted with a very high level of technical capability with experienced geologists and drillers. The laboratory used (K‐UTEC) is regarded as one of the most experienced salt technological facilities in the world. |
| Audits or reviews |
The results of any audits or reviews of sampling techniques and data. |
Original analytical results retained in the K‐UTEC archives were reviewed where possible and compared with historical records stored at the BVVG archives. No original core or sample material is available, however, the available data is of sufficient quality to support an Inferred Resource. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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Section 2 Reporting of Exploration Results
Criteria listed in the preceding section also apply to this section.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Mineral tenement and land tenure status |
Type, reference name/number, location and ownership including agreements or material issues with third parties such as joint ventures, partnerships, overriding royalties, native title interests, historical sites, wilderness or national park and environmental settings. |
Davenport Resources Limited is a publicly listed company on the Australian Securities Exchange and holds the Mühlhausen‐Nohra mining licences through its wholly owned subsidiary East Exploration GmbH. The Mühlhausen‐ Nohra mining licence is located within the South Harz Potash District of the Thuringian Basin, Germany. |
| The security of the tenure held at the time of reporting along with any known impediments to obtaining a licence to operate in the area. |
There are no known impediments to the security of the tenure that Davenport have over the Mühlhausen‐Keula sub‐area. The Mühlhausen‐Nohra mining licence is perpetual in nature, not subject to expiry and is valid to explore for and produce ‘potash, including (associated) brine’ with no applicable statutory royalties. The Mühlhausen‐Nohra Mining Licence Deed No. is 1077/95‐611 and has an area of 141.6049 km2 |
|
| Exploration done by other parties |
Acknowledgment and appraisal of exploration by other parties. |
All of the exploration conducted on the Nohra‐ Elende sub‐area is historical. The first recorded evidence of exploration drilling on the Mühlhausen‐Nohra mining licence is from drill hole Kal Moerb 1/1889, drilling of which commenced in 1889, following the completion of which a further 19 drill holes were drilled between the 1890s to 1909. All of the other exploration drilling was conducted by the former GDR. Various parties were involved, most of which combined to form VEB Kombinant after reunification. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Geology | Deposit type, geological setting and style of mineralisation. |
The Mühlhausen‐Nohra mining licence is located in the Südharz (South Harz) Potash District in the north‐western extent of the Thuringian sedimentary basin, which has been separated by the uplift of the northerly Harz Mountains from the South Permian Basin (SPB). The regional stratigraphy of the South Permian Basin is fairly well understood with a pre‐ Variscan basement (Upper Carboniferous and older rocks) and a transition horizon of Upper Carboniferous to Lower Permian lying beneath an expansive sequence of evaporite rocks of the Upper Permian succession. These evaporite deposits are assigned to the Zechstein Group, and host the target potash mineralisation of the South Harz Potash District which occurs on the Mühlhausen‐Keula mining licence. The potash‐bearing target Zechstein Group consists of seven depositional cycles with the potash mineralisation of the South Harz Potash District hosted within the second cycle, the Staßfurt Formation (Z2). The Z2 is further sub‐divided into horizons, of which the Kaliflöz Staßfurt (z2KSt) hosts potentially economic potash. The z2KSt is split into a Hanging Wall Group that has 11 to 19 horizons of finely layered potassium salts and a Footwall Group that has 1 to 10 coarsely layered potassium salts and thick halite layers. The z2KSt is present across the whole of Nohra‐ Elende sub‐area and has an average thickness of 21.8 m. The main mineral present on Nohra‐ Elende is carnallite with additional sylvite. In the Nohra‐Elende sub‐area there is often elevated kieserite associated with carnallitite, which drops off in content towards the base of the carnallitite layer. Kieserite especially high in Kal Pstl 001/1960. |
| Drill hole Information |
A summary of all information material to the understanding of the exploration results including a tabulation of the following |
The drill hole database for Nohra‐Elende is made up of 92 historical drill holes. A table showing the key drill hole information can be found below: |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Criteria | JORC Code explanation | JORC Code explanation | JORC Code explanation | Commentary | Commentary | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| information for all Material drill holes: |
||||||||||||
| Hole ID | Location | Easting (UTM 32N) |
Northing (UTM 32N) |
RL | EOH (m) |
z2 Interse |
KSt ction (m) |
Width (m) |
Average K2O Grade (%) |
|||
| From | To | |||||||||||
| E BtrWr 1/1963 | Off Licence | 602132.00 | 5694538.00 | 272.70 | 534.70 | Not int | ersected | |||||
| E Hzl 3/1970 | Off Licence | 612262.00 | 5688494.00 | 418.80 | 1094.00 | 993.00 | 1011.00 | 18.00 | 8.46 | |||
| E Hzl 4/1970 | Off Licence | 613201.00 | 5688890.00 | 416.20 | 1117.30 | 974.00 | 982.00 | 8.00 | 12.25 | |||
| E Hzl 5/1971 | Off Licence | 614858.00 | 5689968.00 | 406.20 | 1152.50 | 983.00 | 1040.00 | 57.00 | 8.72 | |||
| Kal Aso 1a/1957 | Off Licence | 604005.00 | 5697241.00 | 312.00 | 700.00 | 624.45 | 939.80 | 4.20 | 9.48 | |||
| Kal Bhl 3/1960 | Off Licence | 602750.00 | 5698813.00 | 359.00 | 764.30 | 746.60 | 762.65 | 8.95 | ‐ | |||
| Kal Blei 001/1893 | Off Licence | 611526.00 | 5702281.00 | 235.00 | 540.78 | No | data | |||||
| Kal BtrWr 1961 | Off Licence | 602960.00 | 5694187.00 | 341.30 | 594.00 | 520.33 | 540.30 | 19.97 | ‐ | |||
| Kal Bwo 3 | Off Licence | 600810.00 | 5697180.00 | 281.86 | 419.61 | Stopped short | ||||||
| Kal Ele 01/1894 | Off Licence | 613062.00 | 5699233.00 | 245.00 | 700.00 | 596.00 | 652.50 | 7.00 | 10.70 | |||
| Kal Ele 09/1978 | Off Licence | 612707.00 | 5698514.00 | 260.90 | 714.15 | 678.90 | 691.41 | 0.45 | 11.02 | |||
| Kal Ele 10/1978 | Off Licence | 611931.00 | 5698010.00 | 261.30 | 643.70 | 618.10 | 621.60 | 2.50 | 8.69 | |||
| Kal Ele 11/1977 | Licence | 614434.00 | 5701241.00 | 216.40 | 496.54 | 446.87 | 471.82 | 24.95 | 11.41 | |||
| Kal Ele 12/1977 | Licence | 615961.00 | 5700352.00 | 214.20 | 588.24 | 535.55 | 566.77 | 31.22 | 8.60 | |||
| Kal Ele 13/1978 | Licence | 613768.00 | 5698691.00 | 289.40 | 745.63 | 716.87 | 725.74 | 8.87 | 12.84 | |||
| Kal Ele 14/1977 | Licence | 614586.00 | 5699497.00 | 246.80 | 665.00 | 619.25 | 640.62 | 21.37 | 9.98 | |||
| Kal Ele 15, 5a/1978 | Licence | 615030.00 | 5698261.00 | 302.10 | 766.73 | 670.55 | 751.36 | 80.81 | 9.05 | |||
| Kal Ele 16/1978 | Off Licence | 613960.00 | 5697795.00 | 311.90 | 786.82 | 630.30 | 686.50 | 56.20 | 11.19 | |||
| Kal Ele 17/1978 | Licence | 613151.00 | 5697791.00 | 313.30 | 785.09 | 692.85 | 770.79 | 77.94 | 9.54 | |||
| Kal Ele 18/1978 | Off Licence | 611127.00 | 5697137.00 | 279.50 | 715.23 | No data | ||||||
| Kal Ele 19/1978 | Licence | 615664.00 | 5699809.00 | 258.30 | 664.92 | 481.45 | 505.80 | 24.35 | 9.48 | |||
| Kal Fef /019 | Off Licence | 601433.00 | 5694905.00 | 264.00 | 487.00 | Stopped short | ||||||
| Kal Frod | Off Licence | 608842.00 | 5695021.00 | 443.00 | 836.90 | No data | ||||||
| Kal Gte 001/1961 | Off Licence | 603672.00 | 5692037.00 | 307.40 | 560.10 | 528.24 | 538.43 | 10.19 | ‐ | |||
| Kal HrdeHl 001/1896 | Licence | 617573.00 | 5698037.00 | 240.00 | 797.50 | 621.00 | 654.35 | 33.35 | 11.55 | |||
| Kal HrdeHl 002 | Off Licence | 617790.00 | 5696895.00 | 270.90 | 754.00 | No data | ||||||
| Kal HrdeHl 002/1897 | Licence | 617533.00 | 5698035.00 | 240.00 | 462.52 | Stopped short | ||||||
| Kal HrdeHl 003/1897 | Licence | 617493.00 | 5698023.00 | 240.00 | 463.36 | Stopped short | ||||||
| Kal HrdeHl 003/1899 | Off Licence | 618476.00 | 5697723.00 | 245.70 | 730.30 | No data | ||||||
| Kal HrdeHl 004/1897 | Licence | 617502.00 | 5698064.00 | 240.00 | 462.31 | Stopped short | ||||||
| Kal Hyo 2 | Off Licence | 600607.00 | 5698629.00 | 313.33 | 686.89 | No | data | |||||
| Kal Hyo 4/1961 | Off Licence | 600258.00 | 5699218.00 | 340.64 | 728.00 | 674.30 | 694.63 | 0.44 | 14.35 |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 22 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | JORC Code explanation | Commentary | Commentary | Commentary | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kal Hzl 1/1961 | Off Licence | 610548.00 | 5688466.00 | 412.30 | 1033.80 | 963.27 | 983.78 | 0.53 | 11.92 | |||
| Kal Keh 010/1977 | Off Licence | 614132.00 | 5702958.00 | 244.90 | 465.79 | 420.00 | 443.85 | 12.05 | 9.53 | |||
| Kal Keh 011/1977 | Licence | 615876.00 | 5702682.00 | 287.40 | 535.37 | 480.65 | 507.15 | 26.50 | 8.38 | |||
| Kal Keh 113/1988 | Off Licence | 612925.00 | 5702879.00 | 229.50 | 528.91 | No data | ||||||
| Kal Keh 114/1989 | Off Licence | 612942.00 | 5702868.00 | 229.50 | 534.00 | No data | ||||||
| Kal Keh 1218/1988 | Off Licence | 614476.00 | 5703385.00 | 245.30 | 457.75 | No data | ||||||
| Kal Keh 1519/1988 | Off Licence | 614796.00 | 5703566.00 | 280.20 | 508.87 | No data | ||||||
| Kal Keh 1718/1986 | Off Licence | 614849.00 | 5703818.00 | 265.10 | 499.65 | No data | ||||||
| Kal Keh 2112/1987 | Off Licence | 614757.00 | 5704496.00 | 273.20 | 435.70 | 386.51 | 419.03 | 7.83 | ‐ | |||
| Kal Keh 2509/1988 | Off Licence | 614934.00 | 5704970.00 | 239.00 | 374.72 | Stopped short | ||||||
| Kal Kndr 001/1959 | Licence | 617133.00 | 5699714.00 | 215.78 | 591.80 | 515.22 | 550.20 | 34.98 | 9.40 | |||
| Kal Kwd 001 | Off Licence | 615700.00 | 5697590.00 | 291.80 | 830.40 | No data | ||||||
| Kal Kwd 002 | Off Licence | 615707.00 | 5697660.00 | 290.00 | 536.60 | Stopped short | ||||||
| Kal Kwd 003 | Off Licence | 615712.00 | 5697780.00 | 285.00 | 530.50 | Stopped short | ||||||
| Kal Kwd 004 | Off Licence | 615719.00 | 5697851.00 | 279.70 | 521.60 | Stopped short | ||||||
| Kal Lud /008 | Off Licence | 616368.00 | 5693735.00 | 365.00 | 901.60 | No data | ||||||
| Kal Lud 003/1905 | Off Licence | 616285.00 | 5693312.00 | 354.00 | 762.20 | No data | ||||||
| Kal Lud 007 | Off Licence | 617529.00 | 5697144.00 | 265.20 | 521.10 | Stopped short | ||||||
| Kal Lud 010 | Off Licence | 617402.00 | 5697329.00 | 270.80 | 528.60 | Stopped short | ||||||
| Kal Lud 011/1909 | Off Licence | 618389.00 | 5697625.00 | 249.90 | 485.80 | Stopped short | ||||||
| Kal Mda 4/1984 | Off Licence | 608233.00 | 5688437.00 | 388.60 | 933.86 | 866.00 | 875.71 | 9.71 | 18.92 | |||
| Kal Mlra 001/1899 | Licence | 616563.00 | 5698025.00 | 256.64 | 680.00 | 619.25 | 666.30 | 47.05 | 12.63 | |||
| Kal Moerb 002/1890 | Off Licence | 617983.00 | 5700975.00 | 218.00 | 310.50 | Stopped short | ||||||
| Kal Moerb 004/1894 | Off Licence | 617981.00 | 5701495.00 | 218.00 | 527.00 | No data | ||||||
| Kal Moerb 005/1894 | Off Licence | 617982.00 | 5700995.00 | 218.00 | 617.26 | Stopped short | ||||||
| Kal Moerb 1/1889 | Licence | 618005.00 | 5700926.00 | 230.00 | 316.05 | Stopped short | ||||||
| Kal Moerb 3/1890 | Licence | 618007.00 | 5700876.00 | 218.00 | 316.74 | Stopped short | ||||||
| Kal Nga 001/1895 | Off Licence | 610701.00 | 5697765.00 | 240.00 | 740.00 | No data | ||||||
| Kal Nga 002/1895 | Off Licence | 610722.00 | 5697736.00 | 240.00 | 480.10 | Stopped short | ||||||
| Kal Nga 003/1896 | Off Licence | 610753.00 | 5697717.00 | 240.00 | 479.81 | Stopped short | ||||||
| Kal NohNo 007/1960 | Off Licence | 617175.00 | 5701380.00 | 240.73 | 586.00 | 459.42 | 475.10 | 15.68 | ‐ | |||
| Kal NohNo 010/1978 | Licence | 616651.00 | 5699606.00 | 246.40 | 651.85 | 507.40 | 556.25 | 48.85 | 14.65 | |||
| Kal NohNo 011/1978 | Licence | 616101.00 | 5698535.00 | 242.30 | 815.59 | 641.23 | 695.97 | 54.74 | 9.32 | |||
| Kal NohNo 012/1978 | Licence | 617596.00 | 5698657.00 | 249.00 | 744.75 | 712.63 | 719.10 | 6.47 | 11.41 | |||
| Kal NohNo 013/1978 | Off Licence | 617430.00 | 5697494.00 | 263.00 | 685.00 | 646.70 | 665.64 | 0.32 | 9.45 | |||
| Kal NohNo 014/1978 | Licence | 618801.00 | 5698291.00 | 236.20 | 661.95 | 582.96 | 606.80 | 23.84 | 9.55 | |||
| Kal NohNo 015/1978 | Off Licence | 620231.00 | 5697662.00 | 244.50 | 634.30 | Not int | ersected | |||||
| Kal NohNo 016/1978 | Off Licence | 619302.00 | 5697001.00 | 288.10 | 816.23 | 776.40 | 807.46 | 0.81 | 8.24 |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 23 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
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| Criteria | JORC Code explanation | JORC Code explanation | JORC Code explanation | Commentary | Commentary | Commentary | Commentary | Commentary | Commentary | Commentary | Commentary | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Kal NohNo 017/1979 | Licence | 618526.00 | 5699186.00 | 213.00 | 679.90 | 590.75 | 654.53 | 63.78 | 8.91 | |||
| Kal NohNo 9/1960 | Off Licence | 617114.00 | 5702893.00 | 283.80 | 530.80 | 476.90 | 493.55 | 4.80 | ‐ | |||
| Kal NSo 1 | Licence | 605661.00 | 5693297.00 | 328.40 | 686.70 | 643.10 | 664.60 | 21.50 | 10.93 | |||
| Kal NSo 2 | Licence | 608745.00 | 5694088.00 | 428.00 | 850.00 | 819.00 | 830.00 | 11.00 | 11.08 | |||
| Kal NSo 3 | Licence | 606232.00 | 5692800.00 | 366.80 | 742.82 | 660.33 | 701.23 | 40.90 | 10.56 | |||
| Kal NSo 4 | Off Licence | 613339.00 | 5693671.00 | 335.00 | 684.75 | Stopped short | ||||||
| Kal NSo 5 | Off Licence | 613353.00 | 5693592.00 | 335.00 | 685.00 | Stopped short | ||||||
| Kal NSo 6 | Off Licence | 611641.00 | 5692641.00 | 350.00 | 661.90 | Stopped short | ||||||
| Kal NSo 7 | Off Licence | 605204.00 | 5693468.00 | 328.10 | 460.14 | Stopped short | ||||||
| Kal NSo 8/1907 | Off Licence | 611692.00 | 5692613.00 | 350.00 | 856.60 | 814.98 | 850.70 | 35.72 | 10.22 | |||
| Kal Oga 002/1902 | Off Licence | 610336.00 | 5696156.00 | 320.07 | 717.30 | No data | ||||||
| Kal Probekandidat | Off Licence | 605373.00 | 5694956.00 | 275.20 | 591.14 | No data | ||||||
| Kal Pstl 001/1960 | Licence | 615176.00 | 5700496.00 | 216.76 | 581.30 | 568.50 | 579.00 | 10.50 | 9.27 | |||
| Kal Pstl 002/1960 | Licence | 615683.00 | 5701859.00 | 241.00 | 616.00 | 526.45 | 543.10 | 16.65 | 7.94 | |||
| Kal SosNo 001/1903 | Off Licence | 607943.00 | 5695972.00 | 311.00 | 651.30 | No data | ||||||
| Kal Vll 1/1961 | Off Licence | 604761.00 | 5691417.00 | 361.01 | 672.10 | 608.32 | 638.43 | 1.61 | 9.87 | |||
| Kal Wipp 1/1955 | Licence | 614352.00 | 5702110.00 | 223.70 | 574.40 | 479.15 | 500.70 | 21.55 | 8.28 | |||
| Kal Wr 10 | Off Licence | 601999.00 | 5696488.00 | 266.50 | 533.00 | No data | ||||||
| Kal Wsbn 2/1960 | Off Licence | 620984.00 | 5699620.00 | 207.73 | 602.00 | Not intersected | ||||||
| Kal Wsbn 3/1959 | Licence | 619354.00 | 5699001.00 | 214.67 | 493.80 | 469.88 | 470.42 | 0.54 | 7.20 | |||
| Kal Wsbn 4/1960 | Off Licence | 619597.00 | 5700305.00 | 223.29 | 535.80 | Halite noted in lith log | ||||||
| Kal Wueg 001/1956 | Off Licence | 605287.00 | 5696437.00 | 253.60 | 597.40 | No data | ||||||
| Data aggregation methods |
In reporting Exploration Results, weighting averaging techniques, maximum and/or minimum grade truncations (eg cutting of high grades) and cut‐off grades are usually Material and should be stated. |
The chemical analysis for the Nohra‐Elende sub‐area was composited downhole into 5 m intervals with a minimum composite length of 1 m. A minimum cut‐off grade of 5% K2O was applied to delineate the limits of the potash‐ bearing horizon within the z2KSt. |
||||||||||
| Where aggregate intercepts incorporate short lengths of high grade results and longer lengths of low grade results, the procedure used for such aggregation should be stated and some typical examples of such aggregations should be shown in detail. |
Waste was included in the downhole composite and redistributed to avoid residuals. Numeric fields were composited using the weighted average according to sample length. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 24 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| The assumptions used for any reporting of metal equivalent values should be clearly stated. |
No metal equivalents were used or reported. | |
| Relationship between mineralisation widths and intercept lengths |
These relationships are particularly important in the reporting of Exploration Results. |
All drill holes are vertical with only minor deviations at depth as discussed above. The potash‐bearing horizons are horizontal with only minor gentle undulations and the sample thicknesses are considered to represent true thickness without requiring correction. |
| If the geometry of the mineralisation with respect to the drill‐hole angle is known, its nature should be reported. |
||
| If it is not known and only the down hole lengths are reported, there should be a clear statement to this effect (eg ‘down hole length, true width not known’). |
||
| Diagrams | Appropriate maps and sections (with scales) and tabulations of intercepts should be included for any significant discovery being reported These should include, but not be limited to a plan view of drill‐hole collar locations and appropriate sectional views. |
Diagrams included in the body of the report. |
| Balanced reporting |
Where comprehensive reporting of all Exploration Results is not practicable, representative reporting of both low and high grades and/or widths should be practiced to avoid misleading reporting of Exploration Results. |
All available drill hole information was used. Mühlhausen‐Keula has been reported as a mineral resource, see Section 3 of Table 1. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 25 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Other substantive exploration data |
Other exploration data, if meaningful and material, should be reported including (but not limited to): geological observations; geophysical survey results; geochemical survey results; bulk samples – size and method of treatment; metallurgical test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances. |
As well as the potash and hydrocarbon drill hole information described above, hydrogeological, geotechnical and seismic studies have also been conducted on the Nohra‐Elende sub‐area. The details and results of these projects are written up in the historical archived reports and have not been reviewed by the author as they require translation into English.. |
| Further work | The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large‐scale step‐out drilling). |
The 2018 mineral resources are split into two areas of the Nohra‐Elende sub‐area within the Mühlhausen‐Nohra mining licence. The mineral resource areas are divided by a portion of ground that has insufficient drill hole data to declare a resource. Future work should include increasing confidence in the gap as well as three twin drill holes to confirm the historical grades, possibly accompanied by a seismic survey or a detailed review of the results of the historical seismic survey. The kieserite area is located in the northern section of the Nohra‐ Elende sub‐area. Future work should include a lithological model so that the roof material can be understood and used for further resource definition. When twin drilling is undertaken this should also involve geotechnical sampling. |
| Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. |
At this stage of the project the focus is on increasing confidence and not area of the resource. Positions of suggested holes to be twinned are shown on Figure 11 above. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 26 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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Section 3 Estimation and Reporting of Mineral Resources
(Criteria listed in section 1, and where relevant in section 2, also apply to this section.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Database integrity |
Measures taken to ensure that data has not been corrupted by, for example, transcription or keying errors, between its initial collection and its use for Mineral Resource estimation purposes. |
The database used to create the geological model and mineral resource estimation was based around Micon’s database from 2018 that had been created from manual data entry of hard copy historical drill hole logs and exploration records. The Excel database was cross‐checked against the original drill hole logs in the BVVG and K‐UTEC archives in Berlin and Sondershausen respectively. |
| Data validation procedures used. | When the Excel database is imported into Micromine® modelling software, a data validation exercise is run that includes checking for missing samples, mis‐matching samples and stratigraphy intersections, duplicate records and overlapping from‐to depths. In addition, the sum of chemical compounds was checked to ensure a total of >90% to show that the majority of chemical data had been captured. Any samples that did not have the sum of the elements >90% was excluded from grade modelling. |
|
| Site visits | Comment on any site visits undertaken by the Competent Person and the outcome of those visits. |
The Competent Person visited Mühlhausen‐Nohra on three occasions and incorporated visits to the archives of BVVG and K‐UTEC and the surrounding area where there are currently operating and now dormant Potash mines. The dates for the site visits are 12thto15thFebruary 2018, 6thto 8th March 2018 and 15thto 17thOctober 2019. |
| If no site visits have been undertaken indicate why this is the case. |
Not applicable |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 27 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Geological interpretation |
Confidence in (or conversely, the uncertainty of ) the geological interpretation of the mineral deposit. |
The confidence in the data used and geological interpretation of the potash deposit is high due to the strict guidelines followed during the historical exploration and adherence to the Kali‐Instruktion. In addition, the geological interpretation was checked by several geologists during both the 1960s and 1970s drilling campaigns. Lastly, the depths recorded in the lithological descriptions and geophysical logs correspond, providing confidence in the continuity of the potash horizons and grade. |
| Nature of the data used and of any assumptions made. |
Since there are no records about some of the sampling protocols and sample security, assumptions have been made that this was done to a high standard based on the historical records. Due to the historical nature of the data, it is sometimes unclear which is the final version of the drill hole log and this forms part of the ongoing work that will be required to increase confidence in the resources. |
|
| The effect, if any, of alternative interpretations on Mineral Resource estimation. |
The historical resource estimation carried out in the 1908’s by the VEB Untergrundspeicher Mittenwalde covered an area of 26.5 km2 and considered selective solution mining of the carnallitite with no Hartsalz or sylvinite resources. |
|
| The use of geology in guiding and controlling Mineral Resource estimation. |
The mineralisation is confined to the z2KSt horizon and this was used as the initial basis for geological modelling prior to applying cut‐off grades. |
|
| The factors affecting continuity both of grade and geology. |
Some of the drill holes have a duplication of the z2KSt horizon that suggests there is some localised folding and/or faulting. This can only be tested when horizontal drilling can be done from underground and face mapping. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 28 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Dimensions | The extent and variability of the Mineral Resource expressed as length (along strike or otherwise), plan width, and depth below surface to the upper and lower limits of the Mineral Resource. |
The economic potash deposit covers the whole of the Nohra‐Elende sub‐area contained by the Mühlhausen‐Nohra mining licence with the exception of two zones of halite on to the north east and none to the south west. The mineral resource has been restricted by seam thickness (>1 m) and grade (>5% K2O). The kieserite resource area occurs in the northern part of the Nohra‐Elende sub‐area only. All drill holes hosting kieserite were displayed in plan view and these were used to define an area of kieserite mineralisation that was digitised to form a polygon with an area of 18.73 km2. The kieserite polygon was used to define the mineral resource area and the total Inferred Mineral Resources tonnage is 768 Mt. The minimum depth from surface to the roof of the Main Seam is ± 405 m and the average depth is ± 560 m. |
| Estimation and modelling techniques |
The nature and appropriateness of the estimation technique(s) applied and key assumptions, including treatment of extreme grade values, domaining, interpolation parameters and maximum distance of extrapolation from data points. If a computer assisted estimation method was chosen include a description of computer software and parameters used. |
The geological model and resource estimation for the kieserite area of Nohra‐Elende was carried out in Micromine® modelling software, which is internationally recognised software used for modelling stratiform deposits. The chemical and mineralogical database was composited downhole into regular 5 m intervals. A minimum composite length of 0.1 m was allowed, waste was included and a residual adjustment was made so that any residual intervals were redistributed within the composite. Grades were estimated using a sample length weighted average. Based on visual observations of kieserite distribution downhole and contact plots that displayed a hard boundary when kieserite content was compared to the limits of the existing Carnallite Seam and Upper Sylvite Seam wireframes, the kieserite model was based on the existing wireframes. The original Carnallite Seam and Upper Sylvite Seam wireframes were modelled by Micon in 2018 by gridding the roof and floor of the respective seams. Details regarding the gridding methodology can be found in the associated Table 1 released in November 2018. The Carnallite Seam and Upper Sylvite Seam |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 29 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| wireframes were combined to form one consolidated seam that Micon called the Main Seam. This was clipped to the extents of the kieserite mineralisation polygon. No top‐cut was applied to the data as histogram and probability plots showed this was not necessary. Ordinary Kriging (OK) was used to estimate the chemical and mineralogical data in a block model. Variography was used to define the search parameters for K2O and kieserite. The respective variogram models were used for the appropriate elements and minerals during estimation. The Major and minor axes were multiplied by a factor of 1 and the semi‐major axis was multiplied by a factor of 0.5. |
||
| The availability of check estimates, previous estimates and/or mine production records and whether the Mineral Resource estimate takes appropriate account of such data. |
An historical Kali‐Instruktion balanced C2reserve and a JORC Exploration Target exists for Nohra‐ Elende. Both are comparable to the Inferred Mineral Resource grade that Micon estimated in 2018, however, the resource tonnages differ due to different resource areas. The latest estimate for the kieserite portion only includes the northern part of the Nohra‐Elende sub‐area. The Inferred tonnage reported herein is in proportion to the 2018 northern section of Nohra‐Elende tonnage, which was 934 Mt and covered a slightly greater extents than the kieserite area. |
|
| The assumptions made regarding recovery of by‐products. |
No assumptions have been made regarding by‐ products at this stage. |
|
| Estimation of deleterious elements or other non‐grade variables of economic significance (eg sulphur for acid mine drainage characterisation). |
The insoluble content has been reported for purposes of metallurgical processing review and is not considered to be significant. |
|
| In the case of block model interpolation, the block size in relation to the average sample spacing and the search employed. |
A blank block model was created using the extents of the Main Seam wireframe. Minimum and maximum extents of the block model are (East: min= 610336, max = 621336; North: min = 5696156, max = 5705456; Z: min = ‐505, max = ‐ 185). Block sizes used were 50 x 50 x 10 with sub‐ block sizes of 25 x 25 x 2.5. Grade was estimated |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 30 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| into parent and sub‐blocks. Search ellipse dimensions were based on the drill hole distribution and variography. The search ellipse dimensions were based on variography. All estimated elements and minerals had a primary search ellipse radius of 1,300 m to ensure coverage between drill holes, which have an irregular pattern and drill hole spacing range from 500 m to 1,400 m. Since the potash mineralisation is relatively horizontal the rotation mode was used for the search ellipse where only the azimuth and plunge are required. The azimuth was set at 180° and the plunge at 0° with a rotation of ‐90°. |
||
| Any assumptions behind modelling of selective mining units. |
No selective mining units were modelled. The resource was modelled according to sylvite and carnallite so the low grade and high grade areas can be distinguished. |
|
| Any assumptions about correlation between variables. |
Not applicable. | |
| Description of how the geological interpretation was used to control the resource estimates. |
The kieserite mineralisation has been confined to the limits of the modelled Carnallite and Sylvite Seams, which are hosted by the z2KSt stratigraphic horizon. |
|
| Discussion of basis for using or not using grade cutting or capping. |
A minimum cut‐off grade of 5% K2O was used as this is considered economic. No top‐cut was applied as the statistical analysis of the data shows a normal distribution with no outlying populations. |
|
| The process of validation, the checking process used, the comparison of model data to drill‐ hole data, and use of reconciliation data if available. |
The composited assay data was compared against original assay data in cross‐section. Modelled wireframes were compared against original stratigraphic interpretations. Validation of the block model included visual comparisons, decluster plots to compare the composite grades against the estimated grades and swath plots to compare the block model grades to the input data. All correlated well. |
|
| Moisture | Whether the tonnages are estimated on a dry basis or with |
Not applicable. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| natural moisture, and the method of determination of the moisture content. |
||
| Cut‐off parameters |
The basis of the adopted cut‐off grade(s) or quality parameters applied. |
A minimum cut‐off grade of 5% K2O was used as this is considered economic. In addition, areas with a seam height of <1 m were excluded. Any samples with < 90 % total chemical analysis or < 2% kieserite mineralisation were excluded from the estimation. |
| Mining factors or assumptions |
Assumptions made regarding possible mining methods, minimum mining dimensions and internal (or, if applicable, external) mining dilution. It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider potential mining methods, but the assumptions made regarding mining methods and parameters when estimating Mineral Resources may not always be rigorous. Where this is the case, this should be reported with an explanation of the basis of the mining assumptions made. |
A minimum seam height of 1 m was used as a cut‐ off to take into account potential mining height underground. |
| Metallurgical factors or assumptions |
The basis for assumptions or predictions regarding metallurgical amenability. It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider potential metallurgical methods, but the assumptions regarding metallurgical treatment processes and parameters made when reporting Mineral Resources may not always be rigorous. Where this is the case, this should be reported with an explanation of the basis of |
Processing specifically for Nohra‐Elende has not been considered at this stage. Insoluble material has been modelled. The South Harz area has historically been mined for decades and there is a lot of local knowledge about the metallurgical processes required. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 32 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| the metallurgical assumptions made. |
||
| Environmental factors or assumptions |
Assumptions made regarding possible waste and process residue disposal options. It is always necessary as part of the process of determining reasonable prospects for eventual economic extraction to consider the potential environmental impacts of the mining and processing operation. While at this stage the determination of potential environmental impacts, particularly for a Greenfields project, may not always be well advanced, the status of early consideration of these potential environmental impacts should be reported. Where these aspects have not been considered this should be reported with an explanation of the environmental assumptions made. |
Mining will take place underground. Assumptions regarding environmental factors have been based on the standards set by surrounding potash mines in the area. Davenport has the exclusive right to explore and/or produce and to appropriate the respective mineral resources in a certain field. However, all exploration and production activities require a mining permit (Betriebsplanzulassung) to be applied for with the mining authority. |
| Bulk density | Whether assumed or determined. If assumed, the basis for the assumptions. If determined, the method used, whether wet or dry, the frequency of the measurements, the nature, size and representativeness of the samples. |
T The bulk density for both the sylvinite and carnallitite seams was calculated by Ercosplan based on historical data. The bulk density for each sample was calculated based on the derived mineralogical composition. Density was modelled using the K2O search parameters. The average density for Upper Sylvinite is 2.17 t/m3and 1.895 t/m3for the Carnallitite seam. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 33 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| The bulk density for bulk material must have been measured by methods that adequately account for void spaces (vugs, porosity, etc), moisture and differences between rock and alteration zones within the deposit. |
Not applicable. | |
| Discuss assumptions for bulk density estimates used in the evaluation process of the different materials. |
Not applicable. | |
| Classification | The basis for the classification of the Mineral Resources into varying confidence categories. |
The Nohra‐Elende sub‐area has been classified as an Inferred resource based on the quality and extents of the drilling database that are sufficient to imply geological grade and continuity for eventual economic extraction. A portion of the Nohra‐Elende sub‐area had insufficient data to declare a mineral resource. The whole of the kieserite portion has been classified as Inferred. |
| Whether appropriate account has been taken of all relevant factors (ie relative confidence in tonnage/grade estimations, reliability of input data, confidence in continuity of geology and metal values, quality, quantity and distribution of the data). |
The location of Nohra‐Elende is in an area that has been mining potash for decades. Whilst on site, the Competent Person visited the area where the old Volkenroda ventilation shaft was sunk and other operating underground mines and solutions mines in the neighbouring area such as Bleicherode. |
|
| Whether the result appropriately reflects the Competent Person’s view of the deposit. |
The stated tonnage and grade are considered an appropriate reflection of the Competent Persons view of the deposit. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 34 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Audits or reviews |
The results of any audits or reviews of Mineral Resource estimates. |
No estimates pertaining to the kieserite potential of the Mühlhausen‐Nohra mining licence area have been previously undertaken. Between 1980 and 1987 historical resource estimates were reported for three sub‐areas of the Mühlhausen area including Nohra‐Elende. The exact areas of the three resources were slightly different to the current mining licence boundary. The historical resource estimations were conducted by VEB Geological Research und Exploration. The total C2 balanced resource at the equivalent of the Nohra‐ Elende sub‐area was 816.1Mt at a K2O grade of 8.9%. In 2017 Ercosplan estimated a JORC compliant Exploration Target with a total tonnage range of 1,963 – 2,796Mt at a K2O grade of 8.47 – 11.37%. In 2018 Micon estimated a JORC compliant Inferred Resources with a total tonnage of 1,698 Mt at a K2O grade of 9.69%, 934 Mt of the 2018 estimate was over the northern part of the Nohra‐Elende sub‐area which is where the new kieserite resources have been estimated. |
| Discussion of relative accuracy/ confidence |
Where appropriate a statement of the relative accuracy and confidence level in the Mineral Resource estimate using an approach or procedure deemed appropriate by the Competent Person. For example, the application of statistical or geostatistical procedures to quantify the relative accuracy of the resource within stated confidence limits, or, if such an approach is not deemed appropriate, a qualitative discussion of the factors that could affect the relative accuracy and confidence of the estimate. |
The stated resource tonnage and grades stated are considered based on the detailed drill hole database and 3D modelling. The use of the Ordinary Kriging method is considered appropriate for Nohra‐Elende as the drill holes are relatively far apart, the mineralised zone is flat lying, mineral zones are clearly defined and grade is relatively consistent. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 35 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| The statement should specify whether it relates to global or local estimates, and, if local, state the relevant tonnages, which should be relevant to technical and economic evaluation. Documentation should include assumptions made and the procedures used. |
This statement relates to the global Nohra‐Elende resource. |
|
| These statements of relative accuracy and confidence of the estimate should be compared with production data, where available. |
Not applicable. |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 36 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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Section 4 Estimation and Reporting of Ore Reserves
(Criteria listed in section 1, and where relevant in sections 2 and 3, also apply to this section.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Mineral Resource estimate for conversion to Ore Reserves |
Not applicable for this report | |
| Site visits | ||
| Study status | ||
| Cut‐off parameters | ||
| Mining factors or assumptions | ||
| Metallurgical factors or assumptions |
||
| Environmental | ||
| Infrastructure | ||
| Costs | ||
| Revenue factors | ||
| Market assessment | ||
| Economic | ||
| Social | ||
| Other | ||
| Classification | ||
| Audits or reviews | ||
| Discussion of relative accuracy/ confidence |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.
Page 37 of 37 of JORC Code, 2012 Edition Table 1 Nohra‐Elende Sub‐Area Kieserite Resource
Davenport Resources Ltd
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Section 5 Estimation and Reporting of Diamonds and Other Gemstones
(Criteria listed in other relevant sections also apply to this section. Additional guidelines are available in the ‘Guidelines for the Reporting of Diamond Exploration Results’ issued by the Diamond Exploration Best Practices Committee established by the Canadian Institute of Mining, Metallurgy and Petroleum.)
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Indicator minerals | Not applicable for this report | |
| Source of diamonds | ||
| Sample collection | ||
| Sample treatment | ||
| Carat | ||
| Sample grade | ||
| Reporting of Exploration Results | ||
| Grade estimation for reporting Mineral Resources and Ore Reserves |
||
| Value estimation | ||
| Security and integrity | ||
| Classification |
Micon International Co Limited. Suite 10, Keswick Hall, Keswick, Norwich, Norfolk, U.K., NR4 6TJ Telephone (44) (1603)-501501 Fax (44) (1603)-507007 E-mail [email protected]. Registered no. 4026319, England.