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MARVEL GOLD LIMITED — Capital/Financing Update 2021
Oct 4, 2021
65386_rns_2021-10-04_759d92f3-ef1b-4ce8-b74c-788f45c1b1d5.pdf
Capital/Financing Update
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5 October 2021
TABAKOROLE RESOURCE EXCEEDS 1 MILLION OUNCES Recent discoveries significantly enhance open pit mining potential
Marvel Gold Limited (ASX: MVL) ( Marvel or the Company ) is pleased to announce the upgraded JORC 2012 compliant Mineral Resource Estimate ( MRE ) for the Tabakorole Gold Project ( Tabakorole or the Project ).
HIGHLIGHTS
- Indicated and Inferred Resource of 26.5Mt at 1.2g/t gold for 1.025Moz (at a 0.6 g/t cut-off), representing a 12% increase in ounces from the 2020 MRE.
Table 1: Tabakorole Mineral Resource
| Indicated | Indicated | Indicated | Inferred | Inferred | Total | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
|
| Oxide | 1.4 | 1.2 | 50 | 1.3 | 1.3 | 55 | 2.7 | 1.3 | 110 |
| Fresh | 7.8 | 1.2 | 310 | 16.0 | 1.2 | 610 | 23.8 | 1.2 | 915 |
| Total | 9.2 | 1.2 | 360 | 17.3 | 1.2 | 665 | 26.5 | 1.2 | 1,025 |
Note: Reported at a cut-off grade of 0.6 g/t Au, differences may occur due to rounding.
-
The upgraded Tabakorole MRE exhibits attractive development attributes:
-
70% of the Mineral Resource (715koz) sits within 150m of surface, expected to support a low-strip, open-pittable production scenario.
-
The recent discovery of shallow, higher-grade zones has contributed significantly to the upgraded resource – their location parallel to the preexisting resource is expected to provide low-strip starter pit options.
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High metallurgical recoveries from initial metallurgical testwork indicate Tabakorole is amenable to a simple processing flowsheet.
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There are opportunities for growth in these newly discovered zones. The north-west zone has gaps of up to 200m that require infill drilling and has only been modelled to a vertical depth of 140m.
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The MRE provides a solid foundation for continued resource growth at Tabakorole, with an expansive drilling campaign across the 830km[2] landholding planned to commence in Q4.
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Managing Director Phil Hoskins, commenting on the Tabakorole MRE:
“The upgraded Mineral Resource at Tabakorole is a real exclamation point on a solid year’s exploration in Mali. The deposit continues to demonstrate consistent thicknesses and grades over the 3.2km strike length and the discovery of two shallow, higher-grade zones of mineralisation adjacent to the existing deposit has provided some excellent low-strip starter pit options for a subsequent mining operation.”
“With 70% of the resource in the top 150m and over one million ounces in total, combined with high metallurgical recoveries averaging 97%, Tabakorole is shaping up to meet the criteria for development. In the coming year however, our focus will be on making additional discoveries across our 830km[2] landholding (one of Mali’s largest) to complement our growing baseload resource. We will provide an update of the Company’s specific plans later this month as we embark on our near-deposit exploration program.”
Figure 1: Tabakorole Mineral Resource Estimate plan view
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Recent discoveries enhancing the open pit mining potential
A highlight of the field season was the discovery of a shallow, higher-grade zone of mineralisation sitting adjacent to the north-western portion of the deposit (see Figures 2, 4 and 5). Some of the more significant intercepts included:
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24m at 2.4 g/t gold from 35m in hole 21TBKDD021[1]
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21m at 1.5 g/t gold from 26m in hole 21TBKDD020[1] .
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16m at 2.0 g/t gold from 75m in hole 20TBKRC014[2]
The NW zone has been modelled in 2 lodes in the upgraded MRE, with lengths of ~230m and ~300m respectively. The NW zone remains open between the 2 lodes due to the sparse drilling in this area and also at depth and will be a focus of future work targeting near-deposit resource growth opportunities (see Figure 5).
Figure 2: Cross-section showing shallow, higher-grade north-west zone
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1 ASX announcement 2 September 2021
2 ASX announcement 23 March 2021
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Drilling also discovered a shallow, higher-grade zone of mineralisation sitting adjacent to the central portion of the deposit. Some of the more significant intercepts included:
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21m at 2.6 g/t gold from 70m in hole 21TBKDD014[3] .
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22m at 1.8 g/t gold from 77m in hole 20TBKRC006[4]
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12m at 2.0 g/t gold from 18m and 18m at 1.9 g/t gold from 53m in hole 20TBKRC005[4] .
This zone has been modelled in the upgraded MRE to a length of ~120m and to a maximum depth of 120m. This zone remains open at depth, whilst strike potential needs to be further investigated.
Figure 3: Cross-section showing shallow, higher-grade central zone
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3 ASX announcement 16 August 2021 4 ASX announcement 2 March 2021
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Reporting Cut-off Grades
The resource is considered amenable to open cut mining and is reported at a cut-off grade of 0.6g/t Au, which is both statistically robust and consistent with economic cutoff grades applied at other operations in the region. The final cut-off determination will be dependent on the scale of any potential future operation and the prevailing gold price. A range of other cut-offs presented in Table 2 demonstrates the grade vs cut-off relationships.
Table 2: Tabakorole Mineral Resource Grade-Tonnage
| Indicated | Indicated | Inferred | Total | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Cutoff | Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
| 0.3 | 15.1 | 0.9 | 450 | 26.7 | 0.9 | 800 | 41.8 | 0.9 | 1,245 |
| 0.4 | 13.1 | 1.0 | 425 | 23.6 | 1.0 | 760 | 36.6 | 1.0 | 1,185 |
| 0.5 | 11.0 | 1.1 | 395 | 20.4 | 1.1 | 715 | 31.4 | 1.1 | 1,110 |
| 0.6 | 9.1 | 1.2 | 360 | 17.4 | 1.2 | 665 | 26.5 | 1.2 | 1,025 |
| 0.7 | 7.5 | 1.4 | 330 | 14.6 | 1.3 | 605 | 22.2 | 1.3 | 935 |
| 0.8 | 6.2 | 1.5 | 295 | 12.2 | 1.4 | 545 | 18.4 | 1.4 | 845 |
| 0.9 | 5.1 | 1.6 | 270 | 10.0 | 1.5 | 485 | 15.1 | 1.6 | 755 |
| 1.0 | 4.3 | 1.8 | 240 | 8.4 | 1.6 | 440 | 12.7 | 1.7 | 680 |
Opportunities for resource growth
There are numerous near-deposit opportunities for growing the Tabakorole MRE, including:
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Strike potential and depth extensions of the newly discovered parallel zones (see Figures 2, 3, 4 and 5). Figures 4 and 5 show the updated resource along the 800m long NW zone, highlighting areas that are yet to be brought into the resource model due to the sparse drilling between the 2 lodes.
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Numerous drill-ready targets within a 15km radius of the Tabakorole MRE underpinned by multi-element soil anomalism and supporting structural data.
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Continued systematic exploration of the Company’s 830km[2] landholding (see Figure 5) – no exploration has been conducted outside of the Tabakorole permit since the 1990’s.
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Figure 4: New North-west zone remains open along strike
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Figure 5: North-west zone long section
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The Company is already aware of several occurrences of confirmed gold mineralisation within 15km of the Tabakorole Mineral Resource including at the T1 target which had a
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best historical intercept of 14m at 9.8g/t[5] and on the Groot trend where recent aircore drilling encountered 4m at 1.3g/t[6] and 4m at 2.7g/t[6] ending in mineralisation (see Figure 6 below).
Figure 6: Regional targets and additional mineralised areas
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Combined with an ideal structural setting proximal to the Bannifin Shear Zone, these occurrences of mineralisation provide support to the prospectivity of the Company’s landholdings.
Later this month, the Company will detail its exploration plans for the upcoming field season commencing in Q4. Key programs are expected to include:
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An expansive drill program testing numerous high-conviction targets with coincident soil anomalism and structural support.
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Continued collection of multi-element soil geochemistry and, where appropriate, geophysics.
5 ASX announcement 17 June 2020
6 ASX announcement 8 July 2021
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MINERAL RESOURCE ESTIMATE – TECHNICAL
The reader is referred to Marvel’s maiden Mineral Resource Estimate for Tabakorole announced on 30 September 2020. Only sections of that announcement that require updates have been included below. All other sections remain unchanged.
Project Ownership
The Project is held through 100%-owned licences as well as two separate joint ventures, with Oklo Resources Limited (ASX: OKU) ( Oklo JV) , in which the Company holds an 80% interest) and with Altus Strategies plc ( Altus JV) , in which the Company currently holds a 51% interest, expected to increase to 70% in the near future.
Drilling Summary
During the 2020-21 field season, the Company completed a total of 9,995m of drilling consisting of 4,320m of Diamond drilling (DD) and 5,675m of Reverse Circulation (RC) drilling which have been used to generate the updated Mineral Resource Estimate.
RC drilling was carried out by Target Drilling while DD was carried out by Capital Limited.
Mineral Resource Estimation
A summary of the material information used to estimate the mineral resource is presented in accordance with JORC 2012 requirements.
The Mineral Resources reported here represent Mineral Resources that were estimated for the Tabakorole gold deposit using the methodology as described below and in Appendix 1. Indicated and Inferred categories of mineralisation have been defined and are reported here as Mineral Resources.
Estimation Methodology
Multiple Indicator Kriging (MIK) with change of support was selected as the most appropriate method for estimating gold for the Tabakorole deposit. A total of two grade estimate domains have been developed within the mineralised zones and based on the geological description in the previous sections and an approximate lower cut-off grade of 0.3 g/t Au.
A block size of 20mE x 25mN x 10mRL was selected as an appropriate block size for estimation based on the drill spacing (50m strike spacing or better), geometry of mineralisation and the likely potential future selective mining unit or SMU (i.e. appropriate for potential open pit mining). An SMU dimension of 5mE x 12.5mN x 5mRL was selected as appropriate for support correction investigation. An indirect lognormal support correction was applied to emulate mining selectivity for the above SMU dimension.
The MIK grade estimates consist of a series of proportions and grades above the predefined cut-off grades estimated into a ‘panel’ or large blocks. The proportions and grades are derived from a targeted SMU block size via change of support process. As such, while the proportions and grades at a certain cut-off for any given panel may be known, its position within the panel is not. To assist with a more intuitive presentation of the model grades, the MIK grade estimates have been localised to SMU dimension blocks using a process identical to that of Localised Uniform Conditioning. The SMU
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sized blocks have been assigned a single grade so that the panel MIK grade estimate grade tonnage curve has been replicated.
Drill Hole Flagging, Compositing, Top Cuts and Variography
Raw sample intervals from the drill hole database were flagged by the estimation domains and composited to 2m downhole intervals for the purposes of equalising sample support and as an input to grade estimation.
The impact of higher-grade gold outliers was examined on composite data using log probability plots and cumulative statistics. This is particularly relevant in the case where extreme grade values may exist, however MIK estimation as implemented at Tabakorole is independent of top cutting and was therefore not applied to the final grade estimate.
Grade and indicator variography were developed based on the downhole composites. Indicator variography was input to the MIK estimates while grade variography was used for the change of support analysis applied to the MIK estimates.
Mining and Metallurgical Parameters and Other Material Modifying Factors
The proposed development scenario for the deposit is as an open cut (pit) mine. No additional mining dilution has been applied to the reported estimate.
The oxide portion of the resource only constitutes approximately 10% of the contained metal. To date, the Company has not completed any metallurgical test work on oxide material. Historically, one campaign has been completed on oxide material. The test work was carried out by Peacocke and Simpson in Zimbabwe in October 2015 on a 100kg sample collected using auger drilling over an area of 20 x 25m centred around hole 06TKDDH-059. This unoptimized test work yielded a total of 90.6% recovery using a conventional cyanidation process. Due to the limited coverage and selective nature of sampling, the results from this test work are not considered representative of the deposit.
The fresh rock portion of the resource constitutes the remaining 90% of the contained metal in the Resource. The Company completed a preliminary program of metallurgical test work during the 2020-21 field season and results from this test work were reported on 27 January 2021.
A total of four composite samples were collected from four diamond drillholes completed by the Company in mid-2020. The composites were made from the coarse split of diamond drilling samples based on the drillhole locations within the deposit and the head grade assay of the original samples. The composites targeted the current Mineral Resource grade of 1.2 g/t gold and ranged from 1.1-1.9 g/t gold. All samples were taken in fresh rock as this material represents approximately 90% of the Tabakorole Mineral Resource.
Results from the bottle roll testing showed high recoveries from all samples, with low cyanide and lime consumption (Table 3). Average leach recoveries were 92.7%, 94.8% and 96.6% for the four samples at the three grind sizes. The high recoveries show that the gold is likely to be recoverable via a simple carbon-in-leach process flow sheet, with no indications of refractory gold.
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Table 3: Bottle roll direct cyanidation results from sulphide composites from Tabakorole
| SAMPLE ID | GRIND SIZE (µm) |
CONSUMPTION | CONSUMPTION | |||
|---|---|---|---|---|---|---|
| GOLD | ||||||
| LEACH RECOVERY (%) |
CALCULATED HEAD(g/t) |
RESIDUE (g/t) |
NaCN (kg/t) |
LIME (kg/t) |
||
| COMP 1 | 75 | 96.05 | 1.14 | 0.05 | 0.24 | 0.33 |
| COMP 2 | 75 | 97.36 | 1.14 | 0.03 | 0.42 | 0.41 |
| COMP 3 | 75 | 96.24 | 1.20 | 0.05 | 0.29 | 0.54 |
| COMP 4 | 75 | 96.66 | 1.95 | 0.07 | 0.28 | 0.26 |
| AVERAGE | 75 | 96.58 | 0.39 | |||
| 1.36 | 0.05 | 0.31 | ||||
| COMP 1 | 106 | 93.97 | 1.16 | 0.07 | 0.31 | 0.35 |
| COMP 2 | 106 | 95.95 | 1.11 | 0.05 | 0.35 | 0.37 |
| COMP 3 | 106 | 94.06 | 1.18 | 0.07 | 0.22 | 0.47 |
| COMP 4 | 106 | 95.29 | 1.70 | 0.08 | 0.31 | 0.27 |
| AVERAGE | 106 | 94.82 | 0.37 | |||
| 1.29 | 0.07 | 0.30 | ||||
| COMP 1 | 150 | 92.47 | 1.33 | 0.10 | 0.29 | 0.34 |
| COMP 2 | 150 | 94.36 | 1.15 | 0.07 | 0.31 | 0.35 |
| COMP 3 | 150 | 91.59 | 1.19 | 0.10 | 0.25 | 0.48 |
| COMP 4 | 150 | 92.28 | 1.81 | 0.14 | 0.31 | 0.27 |
| AVERAGE | 150 | 92.68 | 0.36 | |||
| 1.37 | 0.10 | 0.29 | ||||
No additional modifying factors have been considered as part of this Resource estimate based on the metallurgical results.
Mineral Resource Constraints
The Mineral Resource at Tabakorole represents a global resource and has not been constrained by an optimised pit shell or similar. This is considered appropriate for the current level of understanding and development of the Mineral Resource.
Classification
Resource classification was based on geological confidence and a spatial review of estimation result parameters which reflected the quality of the estimate for each block. At the Tabakorole deposit, areas that had high confidence estimate values, had sufficient drilling density (≤50m section spaced drilling) or were proximal to 50m spaced drill lines were classified as Indicated Resources. The remainder was classified as Inferred.
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Figure 7: Tabakorole Mineral Resource Estimate (showing Indicated and Inferred Classifications)
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This announcement has been approved for release by the Company’s board of directors.
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PHIL HOSKINS Managing Director
For further information, please contact: Phil Hoskins – Managing Director Chris van Wijk – Executive Director, Tel: +61 8 9200 4960 Exploration Tel: +61 8 9200 4960
For more information, visit www.marvelgold.com.au.
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Competent Person’s Statement
The information in this report that relates to the Mineral Resources is based on information compiled by Mr Brian Wolfe, Principal Consultant of International Resource Solutions Pty Ltd which provides consulting services to the Company. Mr. Wolfe is a Member of the Australian Institute of Geoscientists and has sufficient experience which is relevant to the style of mineralisation and types of deposits under consideration and to the activity which has been 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 (JORC Code). An entity associated with Mr Wolfe has a minor shareholding in the company. Mr. Wolfe consents to the inclusion in the presentation of the matters based on his information in the form and context in which it appears.
The information in this announcement that relates to exploration results at Tabakorole is based on information compiled by the Company and reviewed by Mr Chris van Wijk, in his capacity as an Executive Director – Exploration of Marvel Gold Limited. Mr. van Wijk is a Member of the AUSIMM and 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 JORC Code. Mr. van Wijk consents to the inclusion in the report of the matters based upon the information in the form and context in which it appears.
Reference to previous ASX announcements
The information in this announcement that relates to previously reported exploration results at Tabakorole was announced on 17 June 2020, 2 March 2021, 23 March 2021, 8 July 2021 and 2 September 2021. Marvel confirms that it is not aware of any new information or data that materially affects the information included in those announcements.
In relation to Figure 2, the results of drill holes 20TBKRC016 and 20TBKDD008 were previously reported on 23 March 2021 and 17 August 2020 respectively. Marvel confirms that it is not aware of any new information or data that materially affects the information included in those announcements.
In relation to Figure 3, the results of drill hole 10TKRC-04 were previously reported on 17 June 2020. Marvel confirms that it is not aware of any new information or data that materially affects the information included in that announcement.
In relation to Figures 1 and 4, the table below shows the date on which the results shown in those figures were previously reported. Marvel confirms that it is not aware of any new information or data that materially affects the information included in those announcements.
| Drill Hole Number | Date of announcement |
|---|---|
| 21TBKDD018 | 1 September 2021 |
| 20TBKRC014 | 23 March 2021 |
| 20TBKRC018 | 23 March 2021 |
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| Drill Hole Number | Date of announcement |
|---|---|
| 21TBKDD021 | 2 September 2021 |
| 20TBKRC008 | 23 March 2021 |
| 05TKDDH-06 | 17 June 2020 |
| 06TKDDH-008 | 17 June 2020 |
| 06TKDDH-010 | 17 June 2020 |
| 05TKRC-71 | 17 June 2020 |
| 05TKRC-78 | 17 June 2020 |
| 05TKRC-18 | 17 June 2020 |
| 05TKRC-52 | 17 June 2020 |
| 06TKDDH-059 | 17 June 2020 |
| 05TKRC-21 | 17 June 2020 |
| 20TBKRC005 | 2 March 2021 |
| 14TKRC02 | 17 June 2020 |
| 05FLRC-11 | 17 June 2020 |
| 05FLRC-12 | 17 June 2020 |
| 10FLRC-07 | 17 June 2020 |
| 10FLRC-06A | 17 June 2020 |
| 05FLRC-29 | 17 June 2020 |
| 21TBKRC012 | 23 March 2021 |
| 21TBKRCDD001 | 1 June 2021 |
| 20TBK-DD_004 | 17 August 2020 |
| 10FLRC-01A | 17 June 2020 |
| 06FLRC-01 | 17 June 2020 |
| 10FLRC-08 | 17 June 2020 |
| 05FLRC-72 | 17 June 2020 |
| 05FLRC-51 | 17 June 2020 |
| 10FLRC-12A | 17 June 2020 |
| 21TBKDD014 | 16 August 2021 |
| 21TBKDD010 | 8 July 2021 |
| 20TBKRC006 | 2 March 2021 |
| 21TBKDD020 | 1 September 2021 |
| 20TBKDD018 | 1 September 2021 |
| 21TBKDD022 | 1 September 2021 |
| 20TBK_DD_008 | 17 August 2020 |
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| Drill Hole Number | Date of announcement |
|---|---|
| 20TBKRC016 | 23 March 2021 |
| 21TBKDD019 | 1 September 2021 |
| 20TBKRC010 | 18 March 2021 |
| 20TBKRC007 | 18 March 2021 |
| 21TBKDD017 | 1 September 2021 |
| 06TKDDH-034 | 17 June 2020 |
| 06TKDDH-039 | 17 June 2020 |
| 06TKDDH-058 | 17 June 2020 |
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About Marvel Gold
Marvel Gold Limited is an Australian resources company listed on the Australian Securities Exchange under stock code MVL. Marvel Gold is a Mali-focused gold explorer with advanced gold exploration projects and extensive landholdings in South and West Mali.
The Tabakorole Gold Project has a JORC Mineral Resource of 1.025MOz grading 1.2 g/t gold (see ASX announcement dated 30 September 2021), with strong growth prospects along strike and via near-deposit prospectivity over an extensive 830km[2] landholding. Tabakorole is held through 100%-owned licences as well as two separate joint ventures, with Oklo Resources Limited (ASX: OKU) ( Oklo JV) , in which the Company holds an 80% interest) and with Altus Strategies plc ( Altus JV) , in which the Company currently holds a 51% interest.
Marvel Gold has an experienced board and management team with specific skills, and extensive experience, in African based exploration, project development and mining.
Tabakorole Mineral Resource Estimate (JORC 2012)
| Indicated | Indicated | Indicated | Inferred | Inferred | Total | ||||
|---|---|---|---|---|---|---|---|---|---|
| Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
Mt | Au (g/t) |
koz (Au) |
|
| Oxide | 1.4 | 1.2 | 50 | 1.3 | 1.3 | 55 | 2.7 | 1.3 | 110 |
| Fresh | 7.8 | 1.2 | 310 | 16.0 | 1.2 | 610 | 23.8 | 1.2 | 915 |
| Total | 9.2 | 1.2 | 360 | 17.3 | 1.2 | 665 | 26.5 | 1.2 | 1,025 |
Note: Reported at a cut-off grade of 0.6 g/t Au, differences may occur due to rounding.
Mali Gold Projects Location Map
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JORC TABLE 1 REPORTING
Section 1. Sampling Techniques and Data
| Criteria | 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. |
Core assay samples were collected on half core sawed lengthwise with a diamond saw. Sampling intervals were marked by an appropriately qualified geologist depending on geology. Sampling intervals vary between 0.3 and 5 metres in length with an average of 1 metre in mineralisation. Reverse circulation samples are collected directly from the drill rig cyclone at 1 metre intervals and composited into 2 metre samples. Each sample is split with a mechanical rifle splitter to yield an assay sample of approximately five kilograms in weight. The sub-sample is marked and bagged on site. |
| Aspects of the determination of mineralisation that are Material to the Public Report. |
Core samples are selected based on geological criteria (presence of quartz veining and sulphide mineralisation). Sample lengths are between 0.3 and 1.2m in mineralisation and may be up to 3m in unmineralised material. Core samples are crushed to -3mm, split and a 250g sub-sample is pulverised with gold determined byfire assay/AAS based on a 30gcharge. |
|
| 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,bywhat method,etc). |
RC drilling was completed using a face sampling bit to drill a hole of 125mm in diameter. Holes were drilled with a dip of between 45 and 60 degrees and oriented roughly perpendicular to mineralisation where possible. Diamond drilling was conducted using HQ (63mm in diameter) in weathered material and then reduced to NQ (40mm in diameter) in fresh rock. Holes were drilled with a dip of between 45 and 60 degrees and oriented roughly perpendicular to mineralisation. 2020 Diamond drill core was oriented using a Reflex ACT II core orientation tool. |
| Drill Sample Recovery |
Method of recording and assessing core and chip sample recoveries and results assessed. |
Drill hole recoveries were recorded during logging by measuring the length of core recovered per 3m core run. Core recovery was calculated as a percentage recovery of actual core length divided by expected core length. RC weights have been collected to monitor recovery but no recovery calculations for RC drillinghave been calculated. |
| Measures taken to maximise sample recovery and ensure representative nature of the samples. 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. |
Core recovery was routinely measured and monitored and RC sample weights were recorded and monitored in order to calculate sample recoveries. There is no known relationship between recovery and grade. |
|
| Logging | Whether core and chip samples have been geologically and geotechnically logged to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies. |
All recovered geological material (RC chips and drill core) is logged onsite by geologists to a level of detail to support appropriate Mineral Resource estimation, mining studies and metallurgical studies. |
| Whether logging is qualitative or quantitative in nature. Core (or costean, channel, etc) photography. |
Logging of drill core is qualitative and records colour, grain size, texture, lithology, weathering, structure, strain intensity, alteration, veining and sulphides. Geotechnical logging records core recovery, RQD, fracture counts and fracture sets. Density measurements are recorded for each core box using standard dry/wet weight techniques. All drill core is digitally photographed wet, and where possible dry. |
|
| The total length and percentage of the relevant intersections logged. |
All drill holes are logged in full. | |
| Sub-Sampling techniques and sample preparation |
If core, whether cut or sawn and whether quarter, half or all core taken. |
Core samples are selected at intervals typically between 0.3-1.2m in length. Core samples are labelled with a sample tag and aluminium tag recording the hole number, depth and sample number. Core samples are cut in half using a rock saw, with half of the sample retained in the core box and half inserted into a plastic sample bag. |
| If non-core, whether riffled, tube sampled, rotary split, etc and whether sampled wet or dry. |
RC samples are riffle split at the drill rig. Samples are typically dry when split. |
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| Criteria | Explanation | Commentary |
|---|---|---|
| For all sample types, the nature, quality and appropriateness of the sample preparation technique. |
Sample preparation consisted of jaw crushing to -3mm, splitting 500 grams and pulverizing to 95% passing 75µ. A sub-sample of 150-200g (pulp sample) is retained for analysis. The sample preparation procedures carried out are considered acceptable. |
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| Quality control procedures adopted for all sub-sampling stages to maximise representivityof samples. |
Both Core and RC sample duplicates were submitted to monitor bias and ensure representivity of sampling. |
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| 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. |
Duplicates, Blanks and Standards (Certified Reference Material) were used to ensure assay quality and representativeness of sampling. |
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| 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 analysed prior to 2020 were assayed for gold by fire-assay with AAS finish by either SGS Analabs Mali (Morila Mine for material from Tabakorole) or Abilab Afrique de l’Ouest SARL laboratory in Bamako, Mali. 2020 Diamond drilling samples were assayed for gold by fire-assay with AAS finish by MSA Labs in Yamassoukro, Côte d’Ivoire. This is considered to be a total analysis for Gold. |
| 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. |
Not Applicable, no such work carried out. | |
| 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. |
Industry best practice procedures were followed by North Atlantic and included submitting blanks at a rate of 1:20 samples, field duplicates at a rate of 1:20 samples, the use of OREAS Certified Reference Material at a rate of 1:20 samples and a program of check assays analysed at ALS-Chemex in Vancouver. 2020 drilling also followed industry best practice and included submitting blanks at a rate of 1:30 samples, field duplicates at a rate of 1:30 samples, the use of OREAS Certified Reference Material at a rate of 1:30 samples. |
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| Verification of sampling and assaying |
The verification of significant intersections by either independent or alternative company personnel. |
All assays are reviewed by the Competent Person and significant intercepts are calculated as composites >0 5g/t Au with a minimum width of 3m and up to 3m internal dilution. |
| The use of twinned holes. | No twin holes have been drilled. | |
| Documentation of primary data, data entry procedures, data verification, data storage (physical and electronic) protocols. |
All drill hole logging was completed on paper logging sheets and entered into spreadsheets. Historical logging data has been uploaded into a central database with no modification. |
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| Discuss anyadjustment to assaydata. | No assaydata was adjusted,and no averagingwas employed. | |
| 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 located using handheld GPS with 3-5m accuracy and initial Dip and Azimuth determined using a handheld compass. For 2020 drilling a Reflex EZ Shot downhole survey tool was used to record drill hole deviation at intervals of 50m. |
| Specification of thegrid system used | Drill hole collars are recorded in WGS84 UTM Zone 29. | |
| Quality and adequacy of topographic control |
Topographic control has been through a combination of SRTM topography and drill hole collars recorded using handheld GPS. This is considered adequate for the currentpurpose. |
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| Data spacing and distribution |
Data spacing for reporting of Exploration Results. |
Drill hole spacing is variable depending on the location within the deposit but is generally around 50m in areas within the MRE. |
| 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 drill hole spacing is considered sufficient to establish the required degree of geological and grade continuity for the estimation of mineral resources. |
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| Whether sample compositing has been applied. |
For the purposes of public reporting of downhole assay intervals, samples have been composited to produce a weighted grade interval using a cut off 0.5g/t Au, minimum width of 3m and maximum of 3m internal dilution. |
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| Criteria | Explanation | Commentary |
|---|---|---|
| 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. |
Drill holes are generally oriented perpendicular to the strike of geology and shallow dips of drilling are used to intersect the structures at a high angle. |
| 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. |
As drill holes were generally drilled perpendicular to the strike of mineralisation it is not believed that there has been any sampling bias introduced based on the current understanding of the structural orientations and the dip and strike of mineralisation. |
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| Sample Security |
The measures taken to ensure sample security. |
Drill samples were collected by Company personnel directly from the drilling rig and transported to the exploration camp for processing. Prepared samples were then transported directly to the laboratory by road by representatives of the company. Other than sub sampling in the form of riffle splitting or core cutting, no sample preparation was conducted by the company. |
| Audits or reviews |
The results of any audits or reviews of sampling techniques and data. |
Several audits and reviews of data were completed both as part of and prior to the publication of the historical MRE and all concluded that historical work conducted by North Atlantic was completed to a high standard, consistent with industry best practice at the time. Current practices have been reviewed by the Competent Person. |
Section 2. Reporting of Exploration Results
| Criteria | 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. |
Legend Gold Mali SARL is the 100% owner of the Tabakorole licence. The Tabakorole permit was granted under Arrêté N°2015-1823 on the 25thof June 2015 and renewed on the under Arrêté N°2018-3538 on the 8thof October 2018 (First renewal). The permit is currently undergoing it’s second renewal which was lodged with the DNGM on 25thof February 2020. The Company expects that the second renewal of this license will be granted in due course. |
| 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. |
The Tabakorole licence was confirmed to be in good standing as of the 20thof September 2019 via letter of Attestation from the Malian DNGM. Subsequent due diligence carried out on behalf of Marvel Gold by independent specialists engaged by the Company confirmed that the licence has been maintained in good standing. |
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| Exploration done by other parties |
Acknowledgment and appraisal of exploration by other parties. |
The Tabakorole project was initially covered by regional geochemical sampling by BRGM in the 1950’s, however the first mining company to carry out work on the license area was BHP in 1993. The first drilling was conducted by Ashanti Gold Company in 2001. Subsequent drilling programs have been detailed in this announcement. The majority of the work carried out subsequently has been by Legend Gold. Other historical work is summarised in this announcement. |
| Geology | Deposit type, geological setting and style of mineralisation |
The Tabakorole ore deposit as it is currently recognised is an orogenic, hydrothermal gold deposit with much in common with other volcano-sedimentary hosted Birimian style orogenic gold deposits throughout the region. |
| 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 collar o elevation or RL (Reduced Level – elevation above sea |
All relevant drill hole details for drilling used in the current MRE have been published as per announcements on the 17th of June 2020 and 17th of August 2020. |
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| Criteria | Explanation | Commentary |
|---|---|---|
| level in metres) of the drill hole collar o dip and azimuth of the hole o down hole length and interception depth o hole length. |
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| 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. |
Drill holes have been reported with a Significant Intercepts defined above a 0.5g/t Au cutoff grade with minimum 3m intercept and no more than 3m of internal dilution. No top cuts have been applied. |
| 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. |
As above. | |
| The assumptions used for any reporting of metal equivalent values should be clearly stated. |
No metal equivalents are reported. | |
| Relationship between mineralisation 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 only the down hole lengths are reported, there should be a clear statement to this effect (eg ‘down hole length, true width not known’). |
All intercepts reported as downhole lengths. True widths of mineralisation have not yet been determined. |
| 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. |
See body of announcement for diagrams. |
| 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. |
Due to the high volume of data on hand, only drill holes with significant intercepts meeting the criteria detailed above have been reported. All drill holes with significant intercepts as defined have been reported as per announcements dated the 17th of June 2020 and 17th of August 2020. |
| 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 |
Not applicable, no other substantive exploration data reported. |
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| Criteria | Explanation | Commentary |
|---|---|---|
| test results; bulk density, groundwater, geotechnical and rock characteristics; potential deleterious or contaminating substances. |
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| Further work | The nature and scale of planned further work (eg tests for lateral extensions or depth extensions or large-scale step-out drilling). Diagrams clearly highlighting the areas of possible extensions, including the main geological interpretations and future drilling areas, provided this information is not commercially sensitive. |
Further drilling to extend the strike and depth extents of the current resource at Tabakorole is planned for the 4thquarter of 2020. This work shall be comprised of a minimum of 2,500m of drilling, in keeping with the current joint-venture commitments. |
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 estimation purposes. Data validation procedures used. |
MVL have a central Maxwell Datashed database, administered by RockSolid Data Consultants. All historical data has been loaded into this system and verified against raw assay certificates and raw logging data. Fixed data entry templates have been emplaced with lookup tables and fixed formats are used for logging, spatial and sampling data. Data transfer is electronic via e-mail. Sample numbers are unique and pre-numbered bags are used. Project geologists also regularly validate assays returned, back to RC chips & drill core intercepts and hard copy results. Data was further validated on import into Vulcan™ mining software. Random checks of assay data from drill hole to database were completed. |
| Site Visits | Comment on any site visits undertaken by the Competent Person and the outcome of those visits. If no site visits have been undertaken indicate why this is the case. |
The Competent Person (CP) for the resource estimate, Mr Brian Wolfe, has not yet visited the project site area due to travel restrictions relating to the COVID 19 pandemic. A site visit will be arranged at the earliest possible opportunity for the purpose of inspection of drilling, drill sites, viewing local surface geology, and a review of available drill core |
| Geological Interpretation |
Confidence in (or conversely, the uncertainty of) the geological interpretation of the mineral deposit. Nature of the data used and of any assumptions made. The effect, if any, of alternative interpretations on Mineral Resource estimation. The use of geology in guiding and controlling Mineral Resource estimation. The factors affecting continuity both of grade and geology. |
The geological interpretation was based on geological information obtained from MVL and its predecessors RC and diamond drilling programs. This included lithological, alteration, veining and structural data. The mineralised shear hosted mineralisation can be traced on mostly 50m spaced sections over approximately 2.9km in total. The mineralisation interpretation utilised an approximate 0.3g/t Au edge cut off for overall shear zone mineralisation. Additional mineralisation exists peripheral to the main shear zone hosted mineralisation but is of a less continuous nature and requires further drilling to determine its overall continuity. A 3D geological model of the major lithologies, structures and weathering profile were used to assist in guiding the mineralisation interpretation The interpretation was developed by of MVL technical staff and reviewed and refined by the CP. No alternate interpretations were considered as the model developed is thought to represent the best fit of the current geological understanding of the deposit and is supported by surface mapping. In the CP's opinion there is sufficient information available from drilling/mapping to build a reliable geological interpretation that is of appropriate confidence for the classification of the resource (Indicated/Inferred). |
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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. |
Known mineralisation consists of multiple lenses of variably distributed gold mineralisation within an overall well-defined shear zone envelope. The shear zone extends along strike for approximately 2.9km and up to 300m in vertical depth below surface. The shear zone is between 20m to 50m in thickness and variably pinches and swells. The shear zone hosted mineralisation is considered to be open in all directions and similar mineralisation has been encountered in aircore drilling 600m to the NW which lies outside the current MRE. (Announcement 6/8/20) |
| 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 availability of check estimates, previous estimates and/or mine production records and whether the Mineral Resource estimate takes appropriate account of such data. The assumptions made regarding recovery of by- products. Estimation of deleterious elements or other non- grade variables of economic significance (e.g. sulphur for acid mine drainage characterisation). In the case of block model interpolation, the block size in relation to the average sample spacing and the search employed. Any assumptions behind modelling of selective mining units. Any assumptions about correlation between variables. Description of how the geological interpretation was used to control the resource estimates. Discussion of basis for using or not using grade cutting or capping. The process of validation, the checking process used, the comparison of model data to drillhole data,and |
Geological and mineralisation constraints were constructed in cross section in Vulcan. Saprock and laterite interpretation was also generated via a sectional interpretation. The constraints thus developed were subsequently used in geostatistics, variography, block model domain coding and grade interpolation. Multiple Indicator Kriging was selected as the most appropriate method for estimating Au, the main element of economic significance. A change of support was applied to emulate mining selectivity at 5mE by 12.5mN by 5mRL dimensions. A block size of 20mE by 25mN by 10mRL was selected as an appropriate block size for MIK grade estimation given the drill spacing and the likely potential future selective mining unit (i.e. appropriate for potential open pit mining). Drillhole assay intersections were flagged by the mineralisation wireframes and subsequently composited to 2m downhole lengths to equalise sample support. Variography from the main domains indicated a moderate to high nugget of approximately 40%, with extended ranges of up to 180m (strike), intermediate range of (dip) to 140m and minor axis of 20m. Elliptical search neighbourhoods within domains were used orientated parallel to the orientation of the shear. Search ranges were based on the variograms and were typically 100m along strike, 100m down dip and 20m across strike. Un-estimated blocks in the first pass were estimated in a second pass with relaxed search parameters to allow all blocks to be estimated. Indicator variography was modelled for input to MIK grade estimates. 17 grade cut offs were chosen per domain and every third indicator variogram calculated and modelled. Intermediate indicator variogram parameters were interpolated based on the bounding modelled variograms. Wireframed mineralisation domains were used as "hard boundaries" for estimation. Oxide and transitional mineralisation were estimated together with the fresh/sulphide mineralisation. Typically, 24 samples were selected for the MIK estimates. A two-pass estimation strategy was devised whereby any blocks not estimated in the first pass were estimated in the second using relaxed estimation neighbourhood parameters. High grade cutting is not a necessary process in the context of MIK grade estimation, however high-grade cutting was undertaken prior to the experimental variogram calculations. High grade cuts were typically light (10g/t or 20g/t) and were considered to have a negligible effect on the overall mean grades. High grade cutting was used in the calculation of the conditional grade statistics as input to the change of support process. The block model estimates were validated by visual comparison of whole block grades (etype) to drill hole composites, comparison of composite and block model statistics, generating grade shells and visually assessing them and swath plots of composite versus whole block model grades. |
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| use of reconciliation data if available. |
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| Moisture | Whether the tonnages are estimated on a dry basis or with natural moisture, and the method of determination of the moisture content. |
The tonnages in the estimate are for dry tonnage with no factoring for moisture. |
| Cutoff Parameters |
The basis of the adopted cutoff grade(s) or quality parameters applied. |
The proposed development scenario for the deposit is as an open cut (pit). Based on this assumption reporting cut offs of 0.3g/t Au and 1.0g/t Au are appropriate for the open pit portion with the cut off dependent on the scale of any potential future operation. The current preferred cut- off for reporting is 0.6g/t Au. |
| 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. |
Open pit mining is assumed throughout, and this has been factored into the grade estimates. A selective mining unit dimension of 5mE by 12.5mN by 5mRL has been selected and this has been used as input to the change of support process for the MIK estimates only. No additional mining dilution has been applied to the reported estimate. |
| 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 the metallurgical assumptions made. |
Metallurgical test work has been described in the body text of this announcement but has not been applied in any way to the current Resource estimate or classification. |
| 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 prospect is at early stage of assessment and no environmental factors have considered in this model estimate. These factors will be evaluated as part of a future scoping study It is the CP's understanding that no environmental factors have currently been identified which would impact the resource estimate reported here. |
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| 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. 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. Discuss assumptions for bulk density estimates used in the evaluation process of the different materials. |
The prospect area is moderately weathered / oxidised with the top of fresh rock over mineralised zones around 15 to 30 metres below surface over the mineralised zones. Bulk densities are based upon 1,393 density measurements over the Project area. All measures utilised industry standard immersion techniques. Bulk densities have been assigned to the model subdivided by oxidation states. An average bulk density of 2.74 g/cm3 has been applied to the fresh rock, 2.48 g/cm3 and 2.41 g/cm3 has been applied to the saprock and the laterite hardcap respectively. The bulk densities are considered reasonable and representative for the rock types and oxidation/weathering states present and are in line with other similar deposits in the region. All are dry densities and void spaces in core are understood to be negligible. |
| Classification | The basis for the classification of the Mineral Resources into varying confidence categories. 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). Whether the result appropriately reflects the Competent Person's view of the deposit. |
The quality of estimate criteria was reviewed spatially and used to assist in resource classification. Areas at Rebecca that had high confidence estimate values, had sufficient drilling density (<50m spaced drilling) or were proximal to 50m spaced drill lines were assigned as Indicated Resources. The remainder was classified as Inferred. Based upon the drill spacing, quality of data, current confidence in the geological understanding of the deposit, continuity of mineralisation and grade it is the Competent Person's opinion that the resource estimate meets the JORC 2012 Guidelines criteria to be classified as an Indicated and Inferred Resource. |
| Audits or Reviews |
The results of any audits or reviews of Mineral Resource estimates. |
Not applicable, no audits or review of the Mineral Resource estimate have been conducted |
| 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 |
The quality of estimate as used to assist in resource classification reflects the number of samples used to estimate a block, the distance a block is from a sample, slope of regression and the kriging error (for ordinary kriged estimates). Blocks which were assigned to the Indicated Category typically were informed by at least 4 drill holes, were less than 30m from the nearest composite, had low kriging errors and had drilling spacing of approximately 50m by 50m or better. The remainder was classified as Inferred. The relative accuracy of the estimate is reflected in the Resource Classification of deposit as per the JORC 2012 Code and is deemed appropriate by the CP. At this stage the bulk estimate is considered to be a global estimate. No production data exists for the project as no mining has taken place to date. |
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| Criteria | JORC Code explanation | Commentary |
|---|---|---|
| affect the relative accuracy and confidence of the estimate. 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. These statements of relative accuracy and confidence of the estimate should be compared with production data, where available. |
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