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ARIKA RESOURCES LIMITED — Capital/Financing Update 2016
Feb 23, 2016
64420_rns_2016-02-23_5637c38a-e8e3-43ec-b838-e471dcc45799.pdf
Capital/Financing Update
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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ASX Code: MCT 24 February 2016
Admiral Bay Zinc Project Resource Upgrade by 15%
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Admiral Bay confirmed as Australia’s largest zinc deposit at 111.3 Mt at 5.7% ZnEq
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Admiral Bay confirmed as one of the largest undeveloped zinc projects in the world
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Geological work on newly modelled zones supports Mineral Resource upgrade by 15%
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Additional Inferred Resources:
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SS6 area, 4.6 Mt at 7.6% ZnEq (4.6% Zn, 2.0% Pb, 27 g/t Ag)
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SS17 area, 1.4 Mt at 5.5% ZnEq (4.1% Zn, 0.8% Pb, 20 g/t Ag)
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Comprehensive lithostratigraphic and structural interpretation, re-logging all drill core, reprocessing 2D seismic data and compilation of a new geological model
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New geological model and Scoping Study on track for completion in March 2016.
Metalicity Limited ( ASX:MCT ) (“ MCT ” or “the Company ”) is pleased to report the completion of a Mineral Resource Estimate for the two extra zones announced on 17 December 2015 (“Significant new mineralised zones identified at Admiral Bay”). The new estimates are for two zones of significant zinc and lead mineralisation within the project area that have not previously had resources estimated. This work was completed as part of the development of a new geological model being undertaken for the 100% owned Admiral Bay Zinc Project, located in the northwest of Western Australia (Figure 1).
The extra resource zones increase the total project resource by 15%. Both of these new zones remain open along strike, and there is good potential to increase these resources with step out drilling. Furthermore, the new geological work suggests that a number of the sub-economic intersections away from the known resources along the Admiral Bay Fault zone may be “near misses” close to higher-grade mineralised zones rather than indicating low potential.
Past reporting of Admiral Bay resources has focused on zinc-rich zones. Although a lead-dominated zone, ‘Zone 3’, was reported, it was not emphasised in the general discussion of the total tonnes in the deposit. Recent geological work has confirmed the presence of Zone 3 lead-dominated mineralisation in the main deposit as well as in these two new areas. The proximity of Zone 3 to the other mineralised zones at Admiral Bay is such that it would be potentially economically extractable as part of a large integrated project. To enable the PFS mining work to address a full range of resource permutations at Admiral Bay, it is considered appropriate to include Zone 3 in the Admiral Bay Mineral Resources, classified as Inferred.
The Inferred Mineral Resource at Admiral Bay is now 111.3 Mt at 5.7% ZnEq[1] (2.3% Zn, 2.7% Pb, 15 g/t Ag) . The strike lengths of the resources and new zones are limited to 2.1 km for the main zone, 200 m for the SS6 zone and 200m for the SS17 zone, out of an 18 km drill-tested mineralised corridor within a 55 km prospective corridor along the Admiral Bay Fault Zone (as announced by PLD on 25/11/2014). Details of the resource estimation are provided below.
1 Zinc Equivalent calculated as ZnEq=Zn+1.06Pb+0.03Ag; full details are presented below
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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The Company is working through a program of comprehensive structural interpretation, re-logging of all drill core and re-processing of 2D seismic data, with teams recently on site at Admiral Bay re-logging both the mineralised and non-mineralised drill core. Integration of the geological and geophysical work will result in the creation of a new 3D geological model.
This model will enhance the understanding of the mineralisation, its continuity and controls, and will be used to identify discrete drill targets with the potential to further upgrade the MRE in both size and classification. This work is being undertaken by industry leading consultants and is due for completion as part of the Scoping Study in March 2016.
Admiral Bay is a carbonate-hosted zinc-lead-silver deposit and classified as a Mississippi Valley-type (MVT) deposit. The deposit, however, does not demonstrate all the characteristics of a typical MVT, notably having greater continuity of stratabound mineralisation, providing further support for the potential of additional resources extending and linking the existing resources in the project area.
Commenting on the MRE Upgrade Managing Director Matt Gauci said:
“The MRE upgrade confirms Admiral Bay as Australia’s largest undeveloped zinc deposit and the world’s 5[th] largest undeveloped zinc deposit. The new geological model in particular is a critical step in understanding the high-grade zones that occur within the system so they may be targeted for future drilling and resource upgrades. The scale of already 5.25 Mt contained zinc from only 2.1 km of an 18 km mineralised corridor, and location in the world class jurisdiction of West Australia, ensures Admiral Bay is of significant interest to the base metals industry, and discussions are ongoing with potential partners.”
New Geological Model
The geological model being compiled is an innovative and modern approach to assessing the Admiral Bay deposit, and consists of the acquisition, compilation and interpretation of data previously unavailable and evaluated for the first time by experts with substantial experience in MVT systems. The process involves:
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Structural, lithofacies and mineralisation interpretation based on re-logging drill core and integration of all data dating back to 1981
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Re-processing historical 2D seismic data to optimises 3D modelling of the horizons that host mineralisation and confirm continuity from drill hole to drill hole
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Re-assess the current resource estimate using all available data including seismic data
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Assess potential for 3D seismic to image structures and mineralisation and provide discrete drill targets
This will result in the compilation of a maiden 3D Geological Model to enhance the understanding of the mineralisation, its continuity and generate discrete drill targets. This work has also identified significant thick higher-grade zones of zinc and lead mineralisation within the existing Mineral Resource Estimate (MRE).
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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Figure 1. Drill core logging
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Figure 2. Example of seismic interpretation (not Admiral Bay)
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Mineral Resource Additions
Following re-logging and interpretation of the main Admiral Bay deposit, the mineralisation in the SS6 zone and in SS17 was re-interpreted using the same criteria as used in the main area. This re-interpretation was then used to create wireframes for these two zones, and resource estimation was undertaken using the same approach as in the main deposit.
A summary of the information and methodology of the resource estimation is as follows:
Drilling techniques
The deposit was sampled using diamond core drilling (DD) over several drilling campaigns undertaken by CRA Exploration Pty Ltd (CRAE) and Kagara Ltd. Five CRAE surface diamond drill holes were used for the resource estimation of these additional zones; four in the SS6 zone and the single intersection of SS17. All drill holes were vertical. Mud rotary pre-collars were used to drill the cover sequence and manage zones of artesian water and gas kicks. CRAE holes were predominantly NQ is size, with limited HQ core.
Sampling and Sub-sampling techniques
The entire length of the drill core was sampled; for CRAE core half core was sampled. The core was routinely sampled on 1 m intervals, with a minimum interval of 0.25 m. Sample sizes are considered appropriate to
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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accurately represent the mineralisation at Admiral Bay based on the thickness and consistency of the intersections, the sampling methodology, and the percent value assay ranges for the primary elements.
The mud rotary pre-collars were collected as 10 m composite samples by the contract mud loggers. These samples were not analysed.
Geological Interpretation
Drill-hole data spacing is variable. The SS6 section comprises four holes averaging 200 m apart. SS17 is a single drill-hole intersection.
The zones are currently interpreted to be coincident with a bioherm associated with the Admiral Bay Fault Zone (ABFZ). Mineralisation appears to be relatively continuous along the axis of the bioherm, but lower grade and less well developed on its flanks. However, the flank areas are poorly defined or tested by drilling.
While mineralisation trend continuity appears to be predictable, grade continuity within the mineralised zones remains relatively uncertain for some of the defined zones and is not adequately defined or constrained by the current drill hole spacing.
Drill-hole intercept logging, wireline interpretation, and assay results have formed the basis for the geological interpretation. The precise limits and geometry cannot be absolutely defined due to the limitations of the current drill coverage. Further work is required to better define the geometry and limits of the mineralised zones. The grade and lithological interpretation forms the basis for the modelling.
Sample Analysis Methods
CRAE samples were processed by Analabs and a four acid digest with AAS finish for Cu, Fe, Pb, Zn, Ag, Ca, Mg; pressed powder XRF for Ba, Sr; and Fusion/Specific ion electrode) for F. A total of 224 samples for SS17 zone and 1,078 samples for SS6 zone were analysed for Zn and Pb.
Wireline logging data including gamma, calliper, density, neutron, resistivity, SP, temperature, sonic and magnetic deviation was collected from all drill holes.
Estimation Methodology
Four individual mineralised envelopes for each zone were interpreted based on the drill-hole sample data using approximate 1.5-2% Zn and/or Pb cut-offs to define coherent zones of sulphide mineralisation.
SS6 and SS17 zones were interpreted using one cross-section for each zone. Each section was displayed in Micromine’s Vizex display environment together with drill-hole traces colour-coded according to the sample grades and sample grade values.
The following techniques were employed while interpreting the mineralisation:
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All interpreted strings were snapped to the corresponding drill-hole intervals, i.e. the interpretation was constrained in the 3rd dimension
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The mineralised zones were extended approximately 100m from the drill-hole section to both sides resulting in 200m length along strike
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The interpretation along dip direction was extended 50m from the peripheral drill holes on a section and 100m from the internal drill holes.
The thickness of the mineralised envelopes varies from 3m to 14m for the SS6 zone and from 3m to 29m for the SS17 zone. The mineralised zones extend from a depth of 1,315 m to a depth of 1,570m below the surface.
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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All Zn, Pb, Cu, Ag, and Ba variables estimated in the Admiral Bay resource model mineralised zones were generated using Inverse Distance (ID) using a power of 2. The ID estimates have been completed using Micromine software. Block discretisation of 2x2x2 points (for X x Y x Z respectively) was used for block estimation. Composite length and bulk density weighting was used in the estimation process.
The block model was constructed using a 25mE x 25mN x 5mRL parent block size, with subcelling to 6.25mE x 6.25mN x 1.25mRL for domain volume resolution. The parent cell size was chosen on the basis of the general morphology of mineralised bodies and in order to avoid the generation of too-large block models. The subcelling size was chosen to maintain the resolution of the mineralised bodies.
A two-pass estimation strategy was applied for all variables estimated (Zn, Pu, Cu, Ag, Sr, and Ba), with progressively expanded sample searches applied to successive estimation passes only considering blocks not previously assigned. First pass searches used an anisotropic range of 600m x 300m x 300m with major axis oriented horizontally along strike. If a block was not estimated in the first pass, a second pass search utilised a maximum range of 1200m x 600m x 600m.
The use of similar search radii for the semi-major and minor axis orientations considered the narrow zones being modelled, the variable orientations and curvature of the zones, and erratic distribution of data within the mineralised zones.
The maximum number of composites used for any estimate was restricted to 20 composites for all estimated variables. The minimum number of composites used for any first pass estimate was 10 composites for all estimated variables. The minimum number of composites used for any second pass estimate was two composites for all estimated variables.
All mineralised zone divisions were treated as hard boundaries for data and parameters used in the estimation process.
The block model size was selected largely as a compromise for adequate volume definition of the narrow mineralised zones in an underground mining scenario.
Classification Criteria
The Inferred Mineral Resource classification is based on the evidence from the available drill sampling and seismic interpretation. This evidence is sufficient to imply but not verify geological and grade continuity.
Cut-off Grades
Four individual mineralised zones were interpreted based on the drill-hole sample data using approximate 1.5–2% Zn and/or Pb cut-offs to define coherent zones of sulphide mineralisation. The resource was reported using a Zinc Equivalent lower cut-off grade of 2%.
Metal Equivalence
Zinc equivalent (ZnEq) calculation parameters are presented in Table 1. The metallurgical recoveries are derived from metallurgical testwork completed by CRAE and Kagara. It is Metalicity’s opinion that all elements included in the metal equivalent calculation have a reasonable potential to be recovered and sold. The calculation formula is ZnEq=Zn+1.06Pb+0.03Ag
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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Table 1 Zinc Equivalence Parameters
| Metal | Metal Price US$ |
Price in Assay units US$ |
Concentrate Recovery % |
Recovered Unit Pricing US$ |
ZnEq Factor1 |
|---|---|---|---|---|---|
| Zinc | 1.00/lb | 22.04per % | 90 | 19.84 | 1.0 |
| Lead | 1.00/lb | 22.04per % | 95 | 20.94 | 1.06 |
| Silver | 19/oz | 0.61perppm | 95 | 0.58 | 0.03 |
| 1 Approximating to head grade |
Metal equivalents are highly dependent on the metal prices used to derive the equivalence formula. Metalicity notes that the metal equivalence method taken above is a simplified approach. Only preliminary metallurgical recoveries are available. The metal prices are assumed indicative LME prices and do not reflect the metal prices that a smelter would pay for concentrate nor are any smelter penalties or charges included in the calculation.
Table 2 Admiral Bay Project Inferred Mineral Resources
| AREA | Tonnage Mt |
Zn % |
Pb % |
Ag ppm |
Ba % |
ZnEq % |
|---|---|---|---|---|---|---|
| SS06 Zone 1 | 2.1 | 3.3 | 0.5 | 15 | 3 | 4.2 |
| SS06 Zone 2 | 2.5 | 5.8 | 3.4 | 38 | 10 | 10.5 |
| SS06 Zone 3 | 0.6 | 0.2 | 3.7 | 8 | 9 | 4.3 |
| SS06 Total | 5.3 | 4.1 | 2.2 | 25 | 7 | 7.2 |
| SS17 Zone 1 | 1.2 | 4.4 | 0.7 | 21 | 3 | 5.7 |
| SS17 Zone 2 | 0.3 | 2.6 | 1.1 | 18 | 23 | 4.3 |
| SS17 Zone 3 | 0.2 | 0.2 | 4.9 | 29 | 14 | 6.2 |
| SS17 Total | 1.7 | 3.5 | 1.4 | 22 | 7 | 5.6 |
| Central Zone 1 | 21.9 | 3.8 | 0.9 | 14 | 7 | 5.2 |
| Central Zone 2 | 35.1 | 4.0 | 2.1 | 20 | 13 | 6.9 |
| Central Zone 3 | 32.2 | 0.1 | 2.6 | 7 | 28 | 3.1 |
| Central Zone 6 | 15.2 | 0.1 | 7.5 | 21 | 15 | 8.7 |
| Coffey Total | 104.4 | 2.2 | 2.8 | 15 | 17 | 5.6 |
| Global Zone 1 | 25.2 | 3.8 | 0.9 | 14 | 6 | 5.1 |
| Global Zone 2 | 37.9 | 4.2 | 2.2 | 21 | 13 | 7.1 |
| Global Zone 3 | 33.1 | 0.1 | 2.6 | 8 | 28 | 3.1 |
| Global Zone 6 | 15.2 | 0.1 | 7.5 | 21 | 15 | 8.7 |
| Global Total | 111.3 | 2.3 | 2.7 | 15 | 16 | 5.7 |
NOTES:
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ZONE 1 (CFM/NFM contact zone – high Zn/low Pb)
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ZONE 2 (NFM-hosted zone – high Zn/high Pb)
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ZONE 3 (NFM-hosted zone – high Pb/low Zn
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ZONE 6 (NFM/GFM contact zone – low Zn/high Pb) CFM = Cudalgarra Formation, NFM=Nita Formation, GFM=Goldwyer Formation
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Inverse Distance (Power=2) Whole Block Estimates using 25mE x 25mN x 5mRL Parent Block Dimensions
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Reported using a Zinc Equivalent lower cut-off grade of 2% where ZNEQ=ZN+(1.06PB)+(0.03AG)
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Unconstrained and using ROUNDED figures
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Past reporting of the Admiral Bay Mineral Resources (e.g. PLD ASX release of 25/11/2014, Kagara release of 22/8/2008) included all the zones of the Central resource reported in this release, but chose to emphasise resources that excluded Zone 3. As discussed above, the proximity of Zone 3 to the other mineralised zones in most areas justifies their classification as Inferred Resources and consideration in the mining studies as part of the current Admiral Bay Scoping Study.
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The 2008 and 2014 Mineral Resource reports used a slightly different formula to calculate ZnEq compared with this report.
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
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Figure 3. Plan view of tenements and drill-hole locations over the 18 km Admiral Bay mineralised corridor
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SS6 Zone 4.62 Mt
SS17 Zone 1.44 Mt
Main Zone 104.4 Mt
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053
Fax: +61 8 9324 3366
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Competent Person Statement
The Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves (the ‘JORC Code’) sets out minimum standards, recommendations and guidelines for Public Reporting in Australasia of Exploration Results, Mineral Resources and Ore Reserves. The Information contained in this announcement has been presented in accordance with the JORC Code and references to “Measured, Indicated and Inferred Resources” are to those terms as defined in the JORC Code.
The information in this report that relates to Geology and Exploration Results is based, and fairly reflects, information compiled by Dr Neal Reynolds, who is a Member of the Australian Institute of Geoscientists. Dr Reynolds is employed by CSA Global Pty Ltd, independent resource industry consultants. Dr Reynolds has sufficient experience which is relevant to the style of mineralisation and type of deposit under consideration and to the activity which he is undertaking to qualify as a Competent Person as defined in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’. Dr Reynolds consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
The information in this report that relates to the Admiral Bay Mineral Resources is based on information compiled by Serikjan Urbisinov, a Competent Person who is a Member of the Australian Institute of Geoscientists. Mr Urbisinov is a full time employee of independent, resource industry consultancy CSA Global Pty Ltd. Mr Urbisinov has sufficient experience that is relevant to the style of mineralisation and type of deposit under consideration and to the activity being undertaken to qualify as a Competent Person as defined in the 2012 Edition of the ‘Australasian Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves’. Mr Urbisinov consents to the inclusion in the report of the matters based on his information in the form and context in which it appears.
All parties have consented to the inclusion of their work for the purposes of this announcement. The interpretations and conclusions reached in this report are based on current geological theory and the best evidence available to the authors at the time of writing. It is the nature of all scientific conclusions that they are founded on an assessment of probabilities and, however high these probabilities might be, they make no claim for absolute certainty. Any economic decisions that might be taken on the basis of interpretations or conclusions contained in this report will therefore carry an element of risk.
About Metalicity Limited
Metalicity Limited is an Australian mining exploration company with a primary focus on base metals sector and the development of the world class Admiral Bay Zinc Project, located in the north west of Australia. The company is currently undertaking a scoping study on Admiral Bay due to be completed by March 2016. The Company’s secondary focus is the rare metals sector with the recent addition of the Pilgangoora South Lithium Project and the Munglinup Graphite Project where early stage exploration has commenced. The Company is supported by a management team with collective experience of over 200 years in the resources sector and a cornerstone investor in Resource Capital Funds, who manage over $2B in resource related funds.
For More Information:
Matt Gauci Managing Director T: +61 9324 1053
David Tasker Professional Public Relations T: +61 8 9388 0944
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
JORC Code, 2012 Edition – Table 1
Section 1 Sampling Techniques and Data
| Criteria | Criteria | JORC Code explanation | Commentary |
|---|---|---|---|
| Sampling | • Nature and quality of sampling (eg cut channels, random chips, or specific | • The deposit was sampled using diamond core drilling (DD) over several | |
| techniques | specialised industry standard measurement tools appropriate to the | drilling campaigns undertaken by CRA Exploration Pty Ltd (CRAE) and by | |
| 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. • Include reference to measures taken to ensure sample representivity and the |
Kagara Ltd (11 holes) and one oil-well, Cudalgarra-1. A total of 21 surface diamond drill holes were used for the resource estimation, of which 18 are within the wireframe, together with oil well Cudalgarra-1. All drill holes were |
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| appropriate calibration of any measurement tools or systems used. | vertical. | ||
| • 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 warrant | |||
| disclosure of detailed information. | |||
| Drilling | • Drill type (eg core, reverse circulation, open-hole hammer, rotary air blast, | • The deposit was sampled using diamond core drilling (DD) over several | |
| techniques | auger, Bangka, sonic, etc) and details (eg core diameter, triple or standard | drilling campaigns by CRAE and Kagara Limited using a UDR5000. | |
| tube, depth of diamond tails, face-sampling bit or other type, whether core is oriented and if so, by what method, etc). |
• Mud-rotary pre-collars were completed to depths of up to 1300m with HQ and NQ diamond core tails through the mineralised zones. |
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| • All drill holes were vertical and core was not oriented. | |||
| • Cudalgarra 1 is a mud rotary petroleum well that intersected the deposit | |||
| Drill | sample | • Method of recording and assessing core and chip sample recoveries and | • Logged core recovery is only available for the Kagara drill holes. The data |
| recovery | results assessed. | indicates excellent average recoveries of 99% of cored portions of the drill | |
| • Measures taken to maximise sample recovery and ensure representative | holes. |
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
| Criteria | Criteria | JORC Code explanation | Commentary |
|---|---|---|---|
| nature of the samples. | • Sample recovery is generally very high (99%) within the mineralised zones. | ||
| • Whether a relationship exists between sample recovery and grade and | No significant bias is expected, and any potential bias is not considered | ||
| whether sample bias may have occurred due to preferential loss/gain of | material at this stage of resource development. | ||
| fine/coarse material. | |||
| Logging | • Whether core and chip samples have been geologically and geotechnically | • All drill core was geologically logged by CRAE and Kagara, and has most | |
| logged to a level of detail to support appropriate Mineral Resource | holes have been re-logged my Metallicity; the drill hole database contains | ||
| estimation, mining studies and metallurgical studies. | adequate geological detail to construct a basic resource model. | ||
| • Whether logging is qualitative or quantitative in nature. Core (or costean, | • A wireline suite comprising gamma, calliper, density, neutron, resistivity, SP, | ||
| channel, etc) photography. | temperature, sonic and magnetic deviation was collected from all drill holes | ||
| • The total length and percentage of the relevant intersections logged. | • Diamond core was geotechnically logged for recovery and RQD for drill | ||
| holes. Information on structure type and orientation are recorded in the | |||
| database. | |||
| • All drill core was logged in full; summary chip logs of the rotary mud | |||
| sections of the holes are also available. | |||
| Sub-sampling | • If core, whether cut or sawn and whether quarter, half or all core taken. | • CRAE HQ core was sampled as half core using a diamond core saw. | |
| techniques | • If non-core, whether riffled, tube sampled, rotary split, etc and whether | • Kagara HQ core sampled as quarter core, NQ as half core, using a diamond | |
| and | sample | sampled wet or dry. | core saw. |
| preparation | • For all sample types, the nature, quality and appropriateness of the sample preparation technique. • Quality control procedures adopted for all sub-sampling stages to maximise representivity of samples. • 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. • Whether sample sizes are appropriate to the grain size of the material being sampled. |
• 10m composites of rotary mud chips were also collected. • The Kagara samples sample preparation process used was PRP88 whereby up to 3.5kg of sample is dried, crushed, then pulverised to 90% passing 75µm • Sample preparation procedures for CRAE samples are not documented. • No sampling QA/QC data by CRAE is documented • Most QA/QC data pertains to Kagara’s samples; there is no documentation of sample duplicates. • Considering the style of mineralisation, sampling of HQ core as quarter core |
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| and NQ core as half core is adequate | |||
| • Although half-core samplingwould bepreferred for HQ,sample sizes are |
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
| Criteria | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|
| considered to be appropriate to accurately represent the mineralisation at | ||||
| Admiral Bay based on the thickness and consistency of the intersections, | ||||
| the sampling methodology and the percent value assay ranges for the | ||||
| primary elements | ||||
| • | For Kagara core, the entire core section was sampled; for CRAE core most of | |||
| the core was sampled and adequately defines the mineralised intervals | ||||
| Quality | of | • The nature, quality and appropriateness of the assaying and laboratory | • | CRAE samples were analysed by Analabs using methods: 103-AAS |
| assay | data | procedures used and whether the technique is considered partial or total. | (perchloric, nitric, hydrochloric and hydrofluoric acid digest with AAS finish) | |
| and | • For geophysical tools, spectrometers, handheld XRF instruments, etc, the | for Cu, Fe, Pb, Zn, Ag; 104-AAS (perchloric, nitric, hydrochloric and | ||
| laboratory | parameters used in determining the analysis including instrument make and | hydrofluoric acid digest with AAS finish) for Ca, Mg; XRF (pressed powder) | ||
| tests | model, reading times, calibrations factors applied and their derivation, etc. | for Ba, Sr; Fusion (Fusion/Specific ion electrode) for F | ||
| • Nature of quality control procedures adopted (eg standards, blanks, | • | Kagara samples were analysed by SGS Mineral Services using methods: | ||
| duplicates, external laboratory checks) and whether acceptable levels of | AAS43B (4 acid digestion with AAS finish) for Cu, Fe, Pb, Zn; ICP40Q (4 acid | |||
| accuracy (ie lack of bias) and precision have been established. | digest with ICPOES finish) for Ag, Ca, Mg, As, Bi, Co Cd, Sb; CSA06V (Leco | |||
| analyser) for S; DP/OES specific fusion with OES finish for Ba and Sr | ||||
| • | QAQC procedures included the insertion of commercial standards (one | |||
| standard for every 25 samples) by Kagara | ||||
| • | CRAE included a limited number of field duplicates of ¼ core but there is no | |||
| record that standards or blanks were submitted. | ||||
| • | Subsequent re-analysis by Kagara concluded that Overall the data quality is | |||
| good but some standard values exceeded the three standard deviation | ||||
| control limit. This is attributed to carry over from the very high grade | ||||
| samples found in the jobs | ||||
| • | Subsequent check analysis in 2000 concluded that the data showed that | |||
| there is very close agreement between the routine and check analyses for | ||||
| Zn, Pb and Ag | ||||
| • | Most QA/QC data pertains to Kagara samples submitted to Genalysis. | |||
| • | Blanks | |||
| • Kagara – no blank samples submitted |
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6 Outram Street, West Perth WA 6005 PO Box 1227, West Perth WA 6872 Phone: +61 8 9324 1053 Fax: +61 8 9324 3366
| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| • Laboratory – Genalysis assayed 34 control blanks. Genalysis review of |
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| Ba and Sr assays of blank material at the approximate detection limits | ||
| of the assays. No details of Pb, Zn, Cu and Ag results are given. | ||
| • Standards | ||
| • Kagara – One standard was included for every 25 samples in the |
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| sample run. Kagara used Gannet standards. | ||
| • Laboratory – Genalysis analysed approximately 47 standard samples |
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| comprising 3 different reference materials. Only Ba and Sr assay are | ||
| referenced, with no details on any analyses for Pb, Zn, Cu and Ag | ||
| elements. | ||
| • Coarse reject duplicates - none | ||
| • Pulp Duplicates - none | ||
| • Repeat Assays (same pulp) | ||
| • Laboratory – Genalysis documented that 30 pulp repeats were |
||
| analysed – re-assayed at a later time than the original samples | ||
| • Repeat Assays (AAS Respray) | ||
| • Laboratory- Genalysis documented that 44 pulp repeats were analysed |
||
| – re-assayed at the same time as the original samples. | ||
| • Genalysis QA/QC documentation (Genalysis, 2008) covers only Ba and Sr | ||
| assays. Apparent lack of review of Pb, Zn, Cu, and Ag results is a major | ||
| omission | ||
| • Available QA/QC results suggest the data quality is suitable for supporting | ||
| an Inferred Resource | ||
| Verification of | • The verification of significant intersections by either independent or | • All mineralised drill intersections in the Central resource area have been |
| sampling and | alternative company personnel. | reclogged; visual examination supports reported assay results |
| assaying | • The use of twinned holes. | • The drill core from the SS16 Zone has not been examined, but core |
| • Documentation of primary data, data entry procedures, data verification, | photographs have been reviewed and support the reported assay results | |
| data storage (physical and electronic) protocols. | • One hole has been twinned, by wedging, Repeatability between ABRD011 | |
| • Discuss any adjustment to assay data. | and ABRD011D2 was reasonable |
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| Criteria | JORC Code explanation | Commentary | |
|---|---|---|---|
| • Kagara logging and analytical data were validated and stored in a relational | |||
| database. Kagara completed data capture and validation of previous CRAE | |||
| drill data and integrated these data into the same relational database | |||
| • Comparison of database results with original CRAE paper logs was | |||
| completed during re-logging and supported the validity of the data capture | |||
| • No adjustments have been made to original assay data | |||
| Location | of | • Accuracy and quality of surveys used to locate drill holes (collar and down- | • CRAE drill-hole collar locations were recorded from the CRAE exploration |
| data points | hole surveys), trenches, mine workings and other locations used in Mineral | reports and checked by Survey North. Although only one collar could be | |
| Resource estimation. | located, the rehabilitated drill-hole pads were easily located. This survey | ||
| • Specification of the grid system used. • Quality and adequacy of topographic control. |
confirmed the approximate locations of the drill holes (±10m) and also the surface RL values (±1m). |
||
| • The CRAE drill holes were down-hole surveyed every 50-100m using a single | |||
| shot survey tool which recorded the deviation from vertical only with no | |||
| assigned azimuth. Because of the lack of azimuth data, the CRAE drill holes | |||
| were assumed to be vertical. | |||
| • Kagara drill holes were downhole surveyed in 3 phases. | |||
| • As part of a larger geophysical logging exercise, downhole surveys |
|||
| were completed by Weatherford using a magnetic deviation tool. | |||
| • The diamond tail of hole ABRD009 was also surveyed using a Keeper |
|||
| Gyro System. A comparison of both surveys reveals only minimal | |||
| variation in the northing coordinate and confirms the validity of the | |||
| magnetic deviation surveys. | |||
| • A third phase of directional surveying was completed by Downhole |
|||
| Surveys of Kalgoorlie using a SPT north–seeking gyro tool | |||
| • The grid system is GDA94 Zone 51. Earlier CRAE work used AGD84 Zone 51, | |||
| but Kagara converted all data to GDA94 |
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| Criteria | JORC Code explanation | Commentary | |
|---|---|---|---|
| • All Kagara collar locations have been picked up by means of DGPS, with | |||
| vertical and horizontal accuracy of around 10cm. Apart from drill hole collar | |||
| surveys, survey definition of surface topography was not essential as a | |||
| constraint for the top of the resource model given the depth of the | |||
| mineralisation | |||
| Data spacing | • Data spacing for reporting of Exploration Results. | • Along the mineralised Admiral Bay Fault Zone trend, drill spacing is variable | |
| and | • Whether the data spacing and distribution is sufficient to establish the | from less than 100 m to more than 4 km. | |
| distribution | degree of geological and grade continuity appropriate for the Mineral | • In the Central 2.7km mineralised zone within M4/249, Kagara drill holes | |
| Resource and Ore Reserve estimation procedure(s) and classifications | were drilled on nominally 400m spaced sections, 150m apart, infilling | ||
| applied. | previous CRAE drilling. | ||
| • Whether sample compositing has been applied. | • Although the data spacing and distribution is very limited, geological | ||
| evidence is sufficient to imply but not verify continuity of mineralisation | |||
| • Lithological packages hosting the mineralisation are discernible on seismic | |||
| imagery and provide further support for evidence of geological continuity | |||
| • Grade continuity is less well established and given the nature of MVT-style | |||
| mineralisation is expected to be complex | |||
| • It is considered that available data is sufficient to demonstrate spatial and | |||
| grade continuity of the mineralised horizon to support the classification of | |||
| Inferred Mineral Resources under the 2012 JORC code | |||
| Orientation | of | • Whether the orientation of sampling achieves unbiased sampling of possible | • The mineralised zones are broadly stratabound and generally appropriate |
| data | in | structures and the extent to which this is known, considering the deposit | for sampling by vertical drill holes, especially for Zones1 & 2. |
| relation | to | type. | • A significant proportion of mineralisation in Zones 3 & 6 occurs within veins |
| geological | • If the relationship between the drilling orientation and the orientation of key | which are often steeply dipping and where drilling may have introduced a |
|
| structure | mineralised structures is considered to have introduced a sampling bias, this | degree of sampling bias, although correlation between drill holes indicates |
|
| should be assessed and reported if material. | that the mineralised envelope as a whole is shallowly dipping |
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| Criteria | JORC Code explanation | Commentary | |
|---|---|---|---|
| Sample | • The measures taken to ensure sample security. | • No information is available regarding sample security, but it is assumed that | |
| security | normal industry-standard practice was followed | ||
| Audits | or | • The results of any audits or reviews of sampling techniques and data. | • No audit has been completed and there has been no detailed validation of |
| reviews | assay data against laboratory certificates |
Section 2 Reporting of Exploration Results
| Criteria | JORC Code explanation | Commentary | |
|---|---|---|---|
| Mineral | • Type, reference name/number, location and ownership including | • The Admiral Bay deposit is located within two granted Mining Leases | |
| tenement and | agreements or material issues with third parties such as joint ventures, | (ML04/244 and ML04/249), which are valid until 20/3/2033 and one | |
| land | tenure | partnerships, overriding royalties, native title interests, historical sites, | granted Exploration Licence (EL04/1610), which is valid until 3/9/2017. |
| status | wilderness or national park and environmental settings. | • The Company acquired the project on 15/9/2015 | |
| • The security of the tenure held at the time of reporting along with any | • The tenement is located wholly within Vacant Crown Land and is covered by | ||
| known impediments to obtaining a licence to operate in the area. | the Native Title Determined Area of the Karajarri People (Area A) | ||
| • The tenements are in good standing with the WA Department of Mines and | |||
| Petroleum (DMP) subject to a minimum annual expenditure commitment of | |||
| $248,100 and annual rents are $46,910. | |||
| Exploration | • Acknowledgment and appraisal of exploration by other parties. | • The Admiral Bay deposit was discovered in 1981 by Meridian Oil NL during | |
| done by other | petroleum exploration, and was subsequently acquired by CRA Exploration | ||
| parties | (the exploration arm of CRA Limited, now Rio Tinto Ltd), who undertook | ||
| substantial exploration from 1986 to 1992. | |||
| • Kagara Ltd acquired the deposit from CRA Exploration in 2004 and | |||
| completed an exploration programme that lead to an initial Inferred | |||
| Resource, as well as a pre-feasibility study to test the viability of the project. | |||
| Kagara Ltd entered into Administration in 2012 and subsequently | |||
| Liquidation in 2013. | |||
| • Past work has been of a high standard and is considered suitable for | |||
| resource estimation |
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| Geology | • Deposit type, geological setting and style of mineralisation. | • Admiral Bay lies within the Admiral Bay Fault Zone, which separates the |
| Broome Platform and Willara Sub-basin of the Canning Basin. | ||
| • Admiral Bay is carbonate-hosted zinc-lead-silver-barium deposit, with | ||
| mineralisation hosted in Ordovician carbonate sediments over a | ||
| mineralised strike extent of at least 18km. | ||
| • Nominally the deposit is classified as a Mississippi Valley Type deposit | ||
| (MVT), however Admiral Bay is not a typical MVT, being strongly | ||
| stratabound, dominated by replacement and veining over open-space fill, | ||
| and characterised by very continuous mineralisation over long strike | ||
| lengths. | ||
| • Within the project area, the surface geology is dominated by Quaternary | ||
| Aeolian sand. Sand sheets in the northwest grade into 2–10m high dunes | ||
| towards the southeast. | ||
| • The Ordovician stratigraphy is overlain by a thick sequence of Cretaceous- | ||
| Jurassic-Permian sandstones/siltstones (up to 1,200m thick) | ||
| • The mineralised zones occur at depths of around 1,250m to 1,700m. The | ||
| upper higher-grade Zn-rich zone is up to 20m thick, whilst the lower higher- | ||
| grade Pb zone is up to 15m thick. These high-grade zones described above | ||
| are hosted within a broad, moderately Zn-Pb mineralised, zone up to 110- | ||
| 120m thick. | ||
| • The Nita Formation hosts the main Zn-rich Zone 2 in a clean limestone unit, | ||
| while Zn-rich Zone 1 occurs on the contact with the overlying Carribuddy | ||
| Formation. | ||
| • The Pb-barite rich mineralisation encompassing Zones 3 and 6 occurs in | ||
| dolomitised limestones in the lower Nita Formation and underlying | ||
| Goldwyer Formations. | ||
| • Zn-rich sulphide mineralisation is characterised by replacement, small-scale | ||
| cavity fill, and minor veining and dissolution. Pb-rich mineralisation | ||
| includes replacive and vein styles. |
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| Criteria JORC Code explanation |
Commentary | Commentary | Commentary | Commentary | Commentary | Commentary |
|---|---|---|---|---|---|---|
| Drill hole Information • A summary of all information material to the understanding of the exploration results including a tabulation of the following information for all Material drill holes: o easting and northing of the drill hole collaro elevation or RL (Reduced Level – elevation above sea level in metres) ofthe drill hole collar o dip and azimuth of the holeo down hole length and interception deptho hole length.• If the exclusion of this information is justified on the basis that the information is not Material and this exclusion does not detract from the understanding of the report, the Competent Person should clearly explain why this is the case. |
• Drilling data is addressed in the Resource estimation Section of this table | |||||
| 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. • 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. • The assumptions used for any reporting of metal equivalent values should be clearly stated. |
• Results were weighted by sample intervals, no top or bottom cuts were applied. • Intersections are length-weighted average grades for zones wider than or equal to 2m and greater than 2% Zn or Pb, including up to 2m of internal waste Zinc equivalent (ZnEq) calculation parameters are presented in below. The metallurgical recoveries are derived from metallurgical testwork completed by CRAE and Kagara. It is Metalicity’s opinion that all elements included in the metal equivalent calculation have a reasonable potential to be recovered and sold. The calculation formula is ZnEq=Zn+1.06Pb+0.03Ag Metal Metal Price US$ Price in Assay units US$ Concentrat e Recovery % Recovered Unit Pricing US$ ZnEq Factor1 Zinc 1.00/lb 22.04 per % 90 19.84 1.0 |
|||||
| Metal | Metal Price US$ |
Price in Assay units US$ |
Concentrat e Recovery % |
Recovered Unit Pricing US$ |
ZnEq Factor1 |
|
| Zinc | 1.00/lb | 22.04 per % |
90 | 19.84 | 1.0 |
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| Criteria JORC Code explanation |
Commentary | Commentary | ||||
|---|---|---|---|---|---|---|
| Lead | 1.00/lb | 22.04 per % |
95 | 20.94 | 1.06 | |
| Silver | 19/oz | 0.61 per ppm |
95 | 0.58 | 0.03 | |
| Relationship between mineralisatio n widths and intercept lengths • These relationships are particularly important in the reporting of Exploration Results. • 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’). _ |
• The mineralised zones at Admiral Bay are approximately tabular and flat lying to shallowly dipping. • Mineralisation is generally intersected with near true width down-hole lengths. |
|||||
| 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 aplan view of drill hole collar locations and |
• Refer to Figures in the body of the report |
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| appropriate sectional views. | ||
| Balanced | • Where comprehensive reporting of all Exploration Results is not practicable, | • All data was used in the resource estimation |
| reporting | representative reporting of both low and high grades and/or widths should | |
| bepracticed to avoid misleading reporting of Exploration Results. | ||
| Other | • Other exploration data, if meaningful and material, should be reported | • Wireline logging data comprising gamma, calliper, density, neutron, |
| substantive | including (but not limited to): geological observations; geophysical survey | resistivity, self-potential, temperature, compensated sonic and magnetic |
| exploration | results; geochemical survey results; bulk samples – size and method of | deviation are available for all drill holes. |
| data | treatment; metallurgical test results; bulk density, groundwater, | • Extensive 2D seismic data both from dedicated surveys at Admiral Bay and |
| geotechnical and rock characteristics; potential deleterious or | from regional petroleum exploration work are available for the project area. | |
| contaminating substances. | • Metallurgical, geotechnical, hydrogeological and mining studies have been | |
| completed on the project. | ||
| Further work | • The nature and scale of planned further work (eg tests for lateral extensions | • PLD aims to design exploration and resource evaluation programmes to test |
| or depth extensions or large-scale step-out drilling). | the controls on and continuity of mineralisation at Admiral Bay. Work to | |
| • Diagrams clearly highlighting the areas of possible extensions, including the | increase the understanding of the continuity of geology and mineralisation | |
| main geological interpretations and future drilling areas, provided this | are fundamental to advancing the project. Planned work includes additional | |
| information is not commercially sensitive. | drilling as well as application of suitable geophysical techniques. | |
| • Work is not yet sufficiently advanced to enable delineation of new target | ||
| areas and zones of potential extensions to mineralisation. |
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Section 3 Estimation and Reporting of Mineral Resources
| 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 estimationpurposes. • Data used in the Mineral Resource estimate of SS6 and SS17 zones was provided in the CSV format and imported into Micromine software. |
| Data validation procedures used. • Database information was validated against previous data supplied for Admiral Bay, imported and desurveyed. Validation of the data import include checks for overlapping intervals, missing survey data, missing and incorrectly recorded assay data, missing lithological data, and missingcollars. |
|
| Site visits | Comment on any site visits undertaken by the Competent Person and the outcome of those visits. • The Competent Person Neal Reynols has visited the site to investigate the core material from previous drilling campaigns. • Also a CSA geologist was present in 1988 during drilling and seismic acquisition activities byCRAE |
| If no site visits have been undertaken indicate why this is the case. • CSA Global conducted a desktop review on the basis of the reports prepared by Digirock, Coffey, Kagara, RSV Australia. Currently, no exploration and drilling activities are being carried out at the deposit to be observed. |
|
| Geological interpretation |
Confidence in (or conversely, the uncertainty of) the geological interpretation of the mineral deposit. • The zones are currently interpreted to be coincident with an antiformal structure associated with the Admiral Bay Fault Zone (ABFZ). Mineralisation appears to be relatively continuous along the strike of the anticline, but lower grade / less well developed on the limbs. However, the limbs areas are poorly defined or tested by drilling. • While structural continuity appears to be predictable, grade continuity within the mineralised zones remains relatively uncertain for some of the defined zones and is not adequately defined / constrained by the current drillhole spacing. • 224 samples for SS17 zone and 1,078 samples for SS6 zone were analysed for Zn, Pb, Ag and Ba. |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| Nature of the data used and of any assumptions made. • Drillhole intercept logging and assay results have formed basis for the geological interpretation. |
|
| The effect, if any, of alternative interpretations on Mineral Resource estimation. • The precise limits and geometry cannot be absolutely defined due to the limitations of the current drill coverage. Further work is required to better define thegeometryand limits of the mineralised zones. |
|
| The use of geology in guiding and controlling Mineral Resource estimation. • Drill hole intercept logging, wireline interpretation and assay results form the basis for the modelling. Coffey Mining developed a geological and mineralisation framework suitable for grade estimation based on a review of the availablegeological andgeochemical data. |
|
| The factors affecting continuity both of grade and geology. • The Mississippi Valley Type Lead-Zinc mineralisation is interpreted to be coincident with an antiformal structure associated with the Admiral Bay Fault Zone. Mineralisation appears to be broadly continuous along the strike of the anticline, but lower grade / less well developed on the limbs, however the local distribution of grade is potentially less continuous. |
|
| 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. • Four individual mineralised envelopes in each zone were interpreted based on the drillhole sample data using approximate 1.5-2% Zn and/or Pub cut-offs to define coherent zones of sulphide mineralisation. • The mineralised zones were extended approximately 100 m from the drill hole section to both sides resulting in 200 m length along strike. • The interpretation along dip direction was extended 50m from the peripheral drill holes on a section and 100m from the internal drill holes. • The thickness of the mineralised envelopes varies from 3m to 14m for SS6 zone and from 3m to 29m for SS17 zone. The mineralised zones extend from the depth of 1,315 m to the depth of 1,570m below the surface. |
| The nature and appropriateness of the estimation technique(s) applied and key assumptions, including treatment of extremegrade values, domaining, • All Zn, Pb, Ag, and Ba variables estimated in the Admiral Bay resource model mineralised zones SS6 and SS17 weregenerated usingInverse |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| Estimation and modelling techniques |
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. Distance (ID) using a power of 2. The ID estimates have been completed using Datamine software. Block discretisation of 2x2x2 points (for X x Y x Z respectively) was used for block estimation. Composite length and bulk densityweightingwas used in the estimationprocess. |
| The availability of check estimates, previous estimates and/or mine production records and whether the Mineral Resource estimate takes appropriate account of such data. • No previous estimates have been completed for these zones, and no mining has taken place. The grade estimates were validated against the data used to create them,both visuallyand statistically. |
|
| The assumptions made regarding recovery of by-products. • No assumption have been made |
|
| Estimation of deleterious elements or other non-grade variables of economic significance(e.g. sulphurfor acid mine drainage characterisation). • Ag, Ba |
|
| In the case of block model interpolation, the block size in relation to the average sample spacing and the search employed. • The block model was constructed using a 25mE x 25mN x 5mRL parent block size, with subcelling to 6.25mE x 6.25mN x 1.25mRL for domain volume resolution. The parent cell size was chosen on the basis of the general morphology of mineralised bodies and in order to avoid the generation of too large block models. The subcelling size was chosen to maintain the resolution of the mineralised bodies. • For all variables estimated (Zn, Pb, Ag, and Ba), a two-pass estimation strategy has been applied, with progressively expanded sample searches applied to successive estimation passes only considering blocks not previously assigned. oFirst pass searches used an anisotropic range of 600x300x300 metres with major axis oriented horizontally along strike oIf a block was not estimated in the first pass, a second pass search utilised a maximum range of 1200x600x600 metres. • The use of similar search radii for the semi-major and minor axis orientations considered the narrow structures being modelled, the variable orientations and curvature of the structures, and erratic distribution of data within the mineralised zones. |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| • The maximum number of composites used for any estimate was restricted to 20 composites for all estimated variables. • The minimum number of composites used for any first pass estimate was 10 composites for all estimated variables. • The minimum number of composites used for any second pass estimate was 2 composites for all estimated variables. • All mineralised zone divisions were treated as hard boundaries for data andparameters used in the estimationprocess. |
|
| Any assumptions behind modelling of selective mining units. • The block model size was selected largely as a compromise for adequate volume definition of the narrow mineralised zones in an underground miningscenario. |
|
| Any assumptions about correlation between variables. • Metal zonation occurs vertically through the mineralised zones and has the following characteristics: oHigher Zn grades in upper zones oHigher Pb grades in lower zones oAg grades are anomalous throughout all mineralised zones, but increase with depth. oBagrades tend to be higher in the lower mineralised zones. |
|
| Description of how the geological interpretation was used to control the resource estimates. • Four individual mineralised envelopes were interpreted based on the drillhole sample data using approximate 1.5-2% Zn and/or Pb cut-offs to define coherent zones of sulphide mineralisation. The zones are currently interpreted to be coincident with an antiformal structure associated with the Admiral BayFault Zone |
|
| Discussion of basis for using or not using grade cutting or capping. • Assessment of the composite data was completed to determine the requirement for highgrade cutting. No topcuts were applied. |
|
| The process of validation, the checking process used, the comparison of model data to drill hole data, and use of reconciliation data if available. • Validation of the block model consisted of comparison of the block model volume to the wireframe volume. Grade estimates were validated bystatistical comparison with the drill data,visual |
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| Criteria | JORC Code explanation | Commentary | Commentary | |
|---|---|---|---|---|
| comparison of grade trends in the model with the drill data trends. No | ||||
| reconciliation data is available at this earlystage of theproject. | ||||
| Moisture | Whether the tonnages are estimated on a dry basis or with natural moisture, | • | The tonnages are estimated on a dry basis | |
| and the method of determination of the moisture content. | ||||
| Cut-off | The basis of the adopted cut-off grade(s) or quality parameters applied. | • | Reported using a Zinc Equivalent lower cut-off grade of 2% | |
| parameters | • | The Mineral Resource is quoted from estimated blocks above this cut- | ||
| offgrade. | ||||
| Mining factors | Assumptions made regarding possible mining methods, minimum mining |
• | Initial study work by Mining Plus indicated that a modified sub-level | |
| or assumptions | dimensions and internal (or, if applicable, external) mining dilution. It is always |
cave (SLC) would be the most appropriate method to mine the deposit. | ||
| necessary as part of the process of determining reasonable prospects for | However, additional work by Kevin Rosengren concluded that whilst an | |||
| eventual economic extraction to consider potential mining methods, but the | uphole retreat sub-level cave mining method may be practical it was | |||
| assumptions made regarding mining methods and parameters when estimating | not optimal or ideal. It suggested that some form of modified room- | |||
| Mineral Resources may not always be rigorous. Where this is the case, this | and-pillar method may be appropriate. | |||
| should be reported with an explanation of the basis of the mining assumptions | • | A subsequent study was carried out by Snowden to test the viability of | ||
| made. | the project based on the known resource. Snowden’s geotechnical | |||
| work, coupled with a cursory literature survey, indicates that an | ||||
| adaptation of a room-and-pillar mining method with paste fill is most | ||||
| appropriate from both ageotechnical and a riskperspective. | ||||
| Metallurgical | The basis for assumptions or predictions regarding metallurgical amenability. It | • | The test work was carried out in the first half of 2009 at Optimet | |
| factors | or | is always necessary as part of the process of determining reasonable prospects |
laboratories. The test work was conducted on various composite | |
| assumptions | for eventual economic extraction to consider potential metallurgical methods, | samples obtained from Kagara. | ||
| but the assumptions regarding metallurgical treatment processes and | • | The Pb and Zn grades are quite variable. The orebody is not | ||
| parameters made when reporting Mineral Resources may not always be | homogenous. The better understanding of the grade variability will | |||
| rigorous. Where this is the case, this should be reported with an explanation of | emerge as the variography testing results become available. Four | |||
| the basis of the metallurgical assumptions made. | mineralised zones are identified. | |||
| • | Four composites: Zn+Pb+Ba (with and without hydrocarbons) and | |||
| Pb+Ba(with and without hydrocarbons),were examined. |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| • The findings of the Optimet work were that recoveries in excess of up to 95% lead and 90% Zn were possible. Silver recoveries were were 56% in Zn concentrate and 46% in Pb concentrate. Metallurgical test work has shown that coarse grained very high quality lead and zinc concentrates could be produced at recoveries in excess of 90% into very high quality concentrates: Zinc concentrategrade of +55% Lead concentrategrade of +70% |
|
| 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. • The establishment of a mine and processing facility at the Admiral Bay site will have significant impact on a large area. • However, only limited environmental monitoring and studies have as yet been completed. |
| 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. • No documentation was provided regarding collection of bulk density data. Data in the drillhole database suggest that the data was collected on-site using the Archimedean method on either half core or whole core samples. The database contains 906 bulk densitydeterminations. |
| The bulk density for bulk material must have been measured by methods that adequately account for void spaces (vughs, porosity, etc.), moisture and differences between rock and alteration zones within the deposit. • No documentation was provided regarding collection of bulk density data. |
|
| Discuss assumptions for bulk density estimates used in the evaluation process of the different materials. • Bulk density data was allocated to the corresponding raw sample intervals containing assay data. It should be noted that the bulk density intervals tended to be smaller and selective relative to the assay intervals. • For bulk density weighting during compositing and estimation, assay intervals not having bulk densities were assigned bulk densities based on linear regression of the Ba% data |
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| Criteria | JORC Code explanation Commentary |
|---|---|
| • For bulk density weighting during compositing and estimation, assay intervals not having bulk densities were assigned bulk densities based on linear regression of the Ba% data |
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| Classification | The basis for the classification of the Mineral Resources into varying confidence categories. • The Inferred Mineral Resource classification is based on the evidence from the available drill sampling and seismic interpretation. This evidence is sufficient to imply but not verify geological and grade continuity. |
| Whether appropriate account has been taken of all relevant factors (i.e. 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 Inferred classification has taken into account all available geological and sampling information, and the classification level is considered appropriate for the current stage of this project. |
|
| Whether the result appropriately reflects the Competent Person’s view of the deposit. • The Mineral Resource estimate appropriately reflects the view of the Competent Person |
|
| Audits or reviews |
The results of any audits or reviews of Mineral Resource estimates. • CSA completed an internal audit of the Resource model. |
| 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 relative accuracy of the Mineral Resource estimate is reflected in the reporting of the Mineral Resource to an Inferred classification as per the guidelines of the 2012 JORC Code |
| 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. • The statement refers to global estimation of tonnes and grade |
|
| These statements of relative accuracy and confidence of the estimate should be compared withproduction data, where available. • No production data is available; this is an advanced exploration project |
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