ALPHAMIN ANNOUNCES AN UPDATED MPAMA SOUTH MINERAL RESOURCE ESTIMATE AND THE DECISION TO COMMENCE WITH DEVELOPMENT

GRAND BAIE, Mauritius, March 29, 2022 (GLOBE NEWSWIRE) — Alphamin Resources Corp. (AFM:TSXV, APH:JSE AltX, “Alphamin” or the “Company”), a producer of 4% of the world’s mined tin

1

from its high-grade operation in the Democratic Republic of Congo, is pleased to announce an updated Mpama South Mineral Resource estimate and the decision to commence with the development of the Mpama South mine and processing plant.


HIGHLIGHTS


  • Mpama South


    updated


    Inferred


    Resource up


    75


    % to


    3.4


    2


    Mt

    based on assays from 22 additional drillholes. Mpama South Mineral Resource now stands at:

    • 0.85Mt @ 2.55% Sn for 21.5kt contained tin in the Indicated category; and
    • 3.42Mt @ 2.45% Sn for 83.7kt contained tin in the Inferred category

  • S


    ignificant


    additional


    resource


    growth potential


    at


    Mpama


    South

    – drilling is on-going with considerable mineralisation intercepted beyond the updated Mineral Resource boundary

  • Decision to commence with the development of Mpama South

    :-

    • Targeted

      first tin production


      by


      December


      2023
    • Estimated

      a


      nnual contained tin

      production of

      7,


      232


      ton


      nes


      3


      at an estimated

      AISC


      2


      of US$1


      5,188


      /t


      tin

      (Based on an assumed US$40,000/t tin price)
    • Estimated

      a


      nnu


      a


      l EBITDA


      2


      of US$


      1


      8


      7


      m


      3


      at an assumed tin price of US$40,000/t

    • Estimated c


      apital development cost of US$1


      1


      6


      m


      3


      providing a projected

      short payback

      in relation to annual EBITDA potential

    • De-risked


      project execution

      with similar mining method, mining fleet and processing route as currently applied at Alphamin’s adjacent Mpama North Mine
    • Capital development cost to be funded from cash reserves
  • Mpama South’s development is expected to increase annual contained tin production from the current 12,000tpa to ~

    20,000


    tpa,


    approximating


    6


    .6


    % of


    the


    world’s mine


    d


    tin



    1


Chief Executive Officer, Maritz Smith comments:

“The development of Mpama South as a brownfields expansion is expected to increase Alphamin’s annual tin production by 65% to a targeted 20,000t from FY2024. Tin and technology are inter-linked and consequently global demand for tin continues to increase despite constrained supply. This development decision and the resultant additional production expected by the end of 2023, positions us to deliver more tin into this widening market deficit.”


Mpama South


Updated


Mineral Resource


Estimate

The updated Mineral Resource for Mpama South follows three weeks after the announcement of the maiden Mineral Resource in the Company’s announcement of 7

th

March 2022. The update is based on the receipt of assays for a further 22 drillholes to the original 79 drillholes on which the Maiden Mineral Resource estimate was based.

The updated Mineral Resource presented in Figure 1 closely follows the spatial position of reported assays which Alphamin presented in its 22

nd

March 2022 Company announcement. This practice of regularly plotting intercepted visual cassiterite and assays in news announcements, as an early indication of where Mineral Resources may potentially extend to and then following it up with regular Mineral Resource updates, is planned to continue during 2022.


Figure


1


:


Updated


Mpama South


Mineral Resource


and visual cassiterite intercepts awaiting assay

Source: Alphamin 2022

Following the receipt of assays for the additional 22 drillholes, an updated Mineral Resource Estimate (MRE) for the Mpama South project was completed. The MRE, which now includes results from 102 drillholes, was estimated using the Canadian Institute of Mining, Metallurgy and Petroleum (CIM) Best Practice Guidelines (2019) and is reported in accordance with the 2014 CIM Definition Standards.

The Mineral Resource is classified into the Indicated and Inferred categories and is reported at a base case tin grade of 1.0%, which satisfies reasonable prospects for economic extraction. Mpama South Inferred Resources increased by 75% to 3.42Mt. The Mineral Resource Statement with an effective date of 28 March 2022 is presented in Table 1:-


Table 1:


Updated


Mpama South


Mineral Resources effective 2


8


March 2022


Classification

Tonnes (millions)

Sn %

Sn Tonnes



(thousands)
Indicated

4
0.85 2.55 21.5
Inferred

5
3.42 2.45 83.7

Mineral Resources that are not Mineral Reserves do not have a demonstrated economic viability and require advanced studies and economic analysis to prove their viability for extraction.

The MRE for Mpama South does not include a substantial quantity of subsequent drilling containing characteristic high grade visual cassiterite. Around 30 additional drillholes and over ~10,000 metres beyond and within the limits of the updated MRE at Mpama South have been completed. Subsequent Mpama South MRE updates are expected to be released throughout the remainder of the drilling phases in 2022 and beyond as assays are received.

The MRE has been completed by Mr. J.C. Witley (BSc Hons, MSc (Eng.)) who is a geologist with 33 years’ experience in base and precious metals exploration and mining as well as Mineral Resource evaluation and reporting. He is a Principal Resource Consultant for The MSA Group (an independent consulting company), is registered with the South African Council for Natural Scientific Professions (SACNASP) and is a Fellow of the Geological Society of South Africa (GSSA). Mr. Witley has the appropriate relevant qualifications and experience to be considered a “Qualified Person” for the style and type of mineralisation and activity being undertaken as defined in National Instrument 43-101 Standards of Disclosure of Mineral Projects.


Preliminary Economic Assessment


(PEA)


Results


on Mpama South

Summary results from the PEA announced on 7 March 2022 are tabulated below. The PEA was based on the maiden Resource estimate and excludes Resources from the updated MRE included in this announcement.


Description


Unit


Value

Avg. Annualised ROM mined and processed ‘000t
4


68
Avg. Annualised ROM grade %Sn
2.2


1
Processing recovery %
7


0


.0
Avg. Annualised Contained tin produced tonnes
7,


232
Avg. Annualised AISC per tonne contained tin sold (At US$40,000/t tin price) $/t tin
1


5,188
Avg. Annualised AISC per tonne contained tin sold (At US$30,000/t tin price) $/t tin
14,326
Avg. Annualised EBITDA (At US$40,000/t tin price) US$’000
1


8


7


,


3


1


0
Avg. Annualised EBITDA (At US$30,000/t tin price) US$’000
121,220
Development Capital Estimate US$’000
1


15


,


970

* The outputs are based on 100% of the project. Alphamin indirectly owns 84,14% of the project.

The PEA is preliminary in nature, it includes Inferred Mineral Resources that are considered too speculative geologically to have economic considerations applied to them that would enable them to be categorized as Mineral Reserves. There is no certainty that the PEA results will be realized. Mineral Resources are not Mineral Reserves and do not have demonstrated economic viability, nor is there certainty that the Mineral Resource will be converted into Mineral Reserves.


Decision to commence with


the development of


Mpama South

PEA studies are conceptual in nature and are most commonly applied to projects at an early stage of exploration to conceptualise potential viability. A PEA is not a pre-feasibility or feasibility study and the Company does not purport the PEA results to be equivalent to a feasibility study. However, notwithstanding the very preliminary and conceptual nature of the PEA, based on the Company’s experience at Mpama North and knowledge base, including regarding underground conditions, the mining method and processing route, and the proximity and very similar characteristics of the deposits, the Company believes that Mpama South represents an immediately accessible adjacent Resource to the current producing Mpama North mine.

The Board has approved the commencement of development of Mpama South without delay taking account of:

  • the opportunity to take advantage of the current and forecasted supply deficit in the tin market;
  • the Company’s ability to self-fund its development from current and short-term forecasted cash reserves;
  • the continued exploration success at Mpama South which has immediate potential for further resource extensions and successful conversion of inferred resources;
  • the expected short payback on this capital investment;
  • the potential significant value any additional production has to the operating profits of the Company in the near term.

The lead time to project completion and commissioning is estimated at 20 months with first tin production targeted by December 2023. The surface infrastructure and processing plant construction will be executed under an EPCM contract model, using contractors who are familiar with the Mpama North mine, and who have proven their competence at the mine to date. The underground mine development will be executed by a dedicated Alphamin mining team who will progress from developing the project to planned production mining.


Qualified Person


s

Mr Jeremy Witley, Pr. Sci. Nat., B.Sc. (Hons.) Mining Geology, M.Sc. (Eng.), is a qualified person (QP) as defined in National Instrument 43-101 and has reviewed and approved the scientific and technical information relating to Mineral Resources contained in this news release. He is a Principal Mineral Resource Consultant of The MSA Group (Pty.) Ltd., an independent technical consultant to the Company.

Mr. Clive Brown, Pr. Eng., B.Sc. Engineering (Mining), is a qualified person (QP) as defined in National Instrument 43-101 and has reviewed and approved all scientific and technical information other than relating to the mineral resources contained in this news release. He is a Principal Consultant and Director of Bara Consulting Pty Limited, an independent technical consultant to the Company.

____________________________________________________________________________


FOR MORE INFORMATION, PLEASE CONTACT:


Maritz Smith


CEO

Alphamin Resources Corp.

Tel: +230 269 4166

E-mail: [email protected]

____________________________________________________________________________



CAUTION REGARDING FORWARD LOOKING STATEMENTS


Information in this news release that is not a statement of historical fact constitutes forward-looking information. Forward-looking statements contained herein include, without limitation, statements relating to


the


result


s


of


the Mpama South PEA


,


including


estimated development cost


s


, estimated quantities of materials to be mined and processed, estimated grades,


metallurgical


recover


ies


and


quantities of


tin to be produced


,


and estimated costs of production and EBITDA,


estimated time for mine construction,


the


merit and


potential viability of the


project, estimated


Mineral Resource


s for Mpama South,


development


of


a mine at Mpama South and anticipated


exploration activities and outcomes


.


Forward-looking statements are based on assumptions management believes to be reasonable at the time such statements are made. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements. Although Alphamin has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements, there may be other factors that cause results not to be as anticipated, estimated or intended. Factors that may cause actual results to differ materially from expected results described in forward-looking statements include, but are not limited to:


uncertaint


ies inherent


in estimates of


Mineral Resource


s, mine development


and


operating


cost


s, mining volumes, grades and processing recoveries, particularly in light of the very early stage at which some of these estimates are being made


,


global economic uncertainties, volatility of metal prices,


uncertainties with respect to social, community and environmental impacts, uninterrupted access to required infrastructure, adverse political


geopolitical


events, impacts of the global Covid-19 pandemic on mining


,


global supply chain issues


which may


caus


e


longer lead-times to procure critical equipment and co


n


sumable


s


which may delay project implementation


as well as those risk factors set out in the Company’s Management Discussion and Analysis and other disclosure documents available under the Company’s profile at www.sedar.com. Forward-looking statements contained herein are made as of the date of this news release and Alphamin disclaims any obligation to update


any forward-looking statements, whether as a result of new information, future events or results or otherwise, except as required by applicable securities laws.



USE OF NON-IFRS FINANCIAL PERFORMANCE MEASURES


This announcement refers to the following non-IFRS financial performance measure


s


:



EBITDA


EBITDA is profit before net finance expense, income taxes and depreciation, depletion, and amortization.


This measure assists readers in understanding the cash generating potential of the


project


including liquidity to fund working capital,


pay taxes,


servic


e


debt, and funding capital expenditures and investment opportunities.


Th


is


measure


is


not recognized under IFRS as


it does


not have any standardized meaning prescribed by IFRS and


is


therefore unlikely to be comparable to similar measures presented by other issuers.


EBITDA


data is intended to provide additional information and should not be considered in isolation or as a substitute for measures of performance prepared in accordance with IFRS.



AISC


This measures the costs to produce a ton


ne


of


contained


tin plus the capital sustaining costs to maintain the mine, processing plant and infrastructure.


AISC


include


s


mine operating production expenses such as mining, processing, administration, indirect charges (including surface maintenance and camp and tailings dam construction costs), smelting


costs and deductions


, refining and freight, distribution, royalties and product marketing fees.


AISC


do


es


not include depreciation, depletion, and amortization, reclamation expenses, borrowing costs and exploration expenses.


Contractual product marketing fees terminate in August 2024, following which date


zero marketing fees have been included in


estimated


AISC and EBITDA.


Sustaining capital expenditures are defined as those expenditures which do not increase


contained


tin


production at a mine site and excludes all expenditures at the Company’s projects and certain expenditures at the Company’s operating sites which are deemed expansionary in nature.



Risks relating to Mineral Resource Estimates


The figures for


Mineral Resource


s contained in this news release are estimates only and no assurance can be given that the anticipated tonnages and grades will be achieved, that the indicated level of recovery will be realized or that the


Mineral Resource


s could be mined or


processed profitably. There are numerous uncertainties inherent in estimating


Mineral Resource


s, including many factors beyond the Company’s control. Such estimation is a subjective process, and the accuracy of any resource estimate is a function of the quantity and quality of available data and of the assumptions made and judgments used in engineering and geological interpretation. Short-term operating factors relating to the


Mineral Resource


s, such as the need for orderly development of the ore bodies or the processing of new or different ore grades, may cause the mining operation to be unprofitable in any particular accounting period. In addition, there can be no assurance that metal recoveries in small scale laboratory tests will be duplicated in larger scale tests under on-site conditions or during production. Lower market prices, increased production costs, the presence of deleterious elements, reduced recovery rates and other factors may result in revision of its resource estimates from time to time or may render the Company’s resources uneconomic to exploit. Resource data is not indicative of future results of operations. If the Company’s actual


Mineral Resource


s are less than current estimates or if the Company fails to develop its resource base through the realization of identified mineralized potential, its results of operations or financial condition may be materially and adversely affected.


Neither the TSX Venture Exchange nor its regulation services provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release


.


Appendix 1: SAMPLE PREPARATION, ANALYSES AND QUALITY CONTROL AND QUALITY ASSURANCE (QAQC)

After receipt of diamond drill core from the drillers at the drill rig in marked core trays, core was transported to the Company’s core shed by the site geologist for logging and sampling. After sample mark up, lithological and geotechnical logging and photography, the core was split longitudinally in half using a water-cooled rotating diamond blade core saw. The cut core was replaced into the core tray with the half to be sampled facing upward. The Archimedes method of weight in air vs weight in water was used to provide relative density measurements on the whole length of the half core that was to be sampled and then replaced in the core trays.

Air dried samples were placed in pre-numbered sample bags together with pre-printed numbered sample tickets, which were cross-checked afterwards to prevent sample swaps. Sample bags were sealed using a plastic cable tie and then placed into poly-weave sacks which were in turn sealed with plastic cable ties. Each poly-weave sack was marked with a number and the sample numbers contained within, ready for delivery to the on-site Alphamin-Bisie laboratory (managed by Anchem) for sample preparation.

At the laboratory, samples were first checked off against the submission list supplied and then weighed and oven dried for 2 hours at 105 degrees Celsius. The dried samples were crushed by jaw crusher to 75% passing 2mm, from which a 250g riffle split was taken. This 250g split was pulverised in ring mills to 90% passing 75μm from which a sample for analysis was taken. Samples were homogenised using a corner-to-corner methodology and two samples were taken from each pulp, one of 10g for on-site laboratory preliminary assaying and another 150g sample for export and independent accredited 3rd party laboratory assaying.

For the initial on-site laboratory assay, 10 grams of pulverised sample is mixed with 2 grams of binder before press pellet preparation at 20t/psi for 1 minute. Press pellets are analysed in a desktop Spectro Xepos XRF analyser, twelve at a time, for Sn, Fe, Zn, Cu, Ag, Pb and As along with a standard, duplicate and blank. The analytical method conducted on the pressed pellet has an expected 10% precision and an upper detection limit of 70,000ppm and lower detection limit of 500ppm. Over-limit samples are titrated by wet chemistry with an upper limit validation of 70% Sn. The on-site laboratory assays are merely an exploration tool and were not used for reporting the exploration results or Mineral Resource estimation, which are based solely on the ALS assays.

The 150g sample is packaged in sealed paper sample envelopes and packed in a box for export in batches of approximately 500 samples and prepared for export authorisation with national authorities. Once authorisation is received, samples are air-couriered to ALS Global in Johannesburg South Africa, a subsidiary of ALS Limited, which is an independent commercial analytical facility. ALS operations are ISO 9001:2015 certificated and the Johannesburg office is ISO 17025 accredited for Chemical Analysis by SANAS (South African National Accreditation System, facility number T087), although the accreditation does not extend to the methods used for tin.

Received samples at ALS Johannesburg are checked off against the list of samples supplied and logged in the system. Quality Control is performed in the way of sieve tests every 50 samples and should a sample fail, the preceding 50 samples are ground in a ring mill pulveriser using a carbon steel ring set to 85 % passing 75μm. Samples are analysed for tin using method code ME-XRF05 conducted on a pressed pellet with 10% precision and an upper limit of 5,000ppm. The over-limit tin samples are analysed as fused disks according to method ME-XRF15c, which makes use of pre-oxidation and decomposition by fusion with 12:22 lithium borate flux containing 20% Sodium Nitrate as an oxidizing agent, with an upper detection limit of 79% Sn.

Method code ME-ICP61 (HF, HNO3, HClO4 and HCl leach with ICP-AES finish) is used for 33 elements including base metals. ME-OG62, a four-acid digestion, is used on ore grade samples for lead, zinc, copper and silver. Both methods are accredited by SANAS.

The program is designed to include a comprehensive analytical quality assurance and control routine comprising the systematic use of Company inserted standards, blanks and field duplicate samples, internal laboratory standards and analysis at an accredited laboratory. The pulps were accompanied by blind QAQC samples inserted into the sample stream by the Alphamin-Bisie geologists. These comprised blank samples, certified reference materials and pulp duplicates each at an insertion rate of approximately 5%.

The QAQC results demonstrate that the assay results are both accurate and precise with an insignificant amount of contamination (in the order of 10pmm Sn on average) and negligible sampling errors.

Laboratory verification work was conducted by check assays conducted at SGS South Africa (Pty) Ltd. This included 105 check samples submitted in November 2021. These samples comprised duplicated pulps from the maiden resource drillholes derived from the sample preparation at the on-site laboratory. CRMs and blanks to an appropriate level also formed part of the 105-sample submission. Check assay results showed that there was a near zero overall bias and that inter-lab precision, after removal of <0.10% Sn samples,was ~85% within 10% error and ~95% within 20% error. Given the nature of high-grade tin variability and previous knowledge of umpire check exercises at the operation, these results are considered acceptable.


Appendix


2


: SIGNIFICANT INTERCEPTS (0.5% Sn lower threshold)

Mpama South Drillholes prefixed “BGH”

Mpama North Drillholes prefixed “MND”


Hole


Easting

Northing

RLm


Azi (°)


Dip (°)


From


To


Sn %


Width

Sample Position

GPS

GPS

(m)


1


mid_x

mid_y

mid_z
BGH017 582535 9884822 732 55 -10 237.8 238.8 4.99 1 582,732 9,884,966 678.6
BGH018

582535

9884822

732

93

0

141.2 144.35 2.07 3.15 582,691 9,884,820 727.9
145.75 151 0.76 5.25 582,696 9,884,820 727.9
BGH019 582535 9884822 732 85 -5 147 152 2.05 5 582,696 9,884,837 715.8
BGH020

582535

9884822

732

84

-15

160.6 164.4 1.45 3.8 582,704 9,884,846 689.3
169.3 171.1 5.42 1.8 582,711 9,884,846 687.7
BGH021

582535

9884822

732

93

-15

109.15 110.25 3.2 1.1 582,654 9,884,821 700.1
164.6 167.32 3.29 2.72 582,708 9,884,818 687.6
BGH022

582554

9884785

732

90

0

75 80.53 3.99 5.53 582,633 9,884,784 729.3
109 110 1.35 1 582,664 9,884,785 729.9
119.22 122.1 2.22 2.88 582,676 9,884,785 730.1
BGH023

582535

9884822

732

75

-15

171.43 174.32 1.72 2.89 582,710 9,884,859 683.7
175.85 178 1.09 2.15 582,714 9,884,860 683
BGH024

582554

9884785

732

103

-5

127.7 129.6 0.54 1.9 582,679 9,884,749 717.2
137.95 142 1.13 4.05 582,690 9,884,746 716.2
BGH025

582535

9884822

732

55

-20

212.25 213.4 0.6 1.15 582,724 9,884,919 662.3
218 221.45 2.29 3.45 582,731 9,884,921 660.7
222.7 223.7 13.05 1 582,734 9,884,923 659.9
228 234.8 2.73 6.8 582,741 9,884,926 658
BGH026

582554

9884785

732

113

-10

103.71 108 3.3 4.29 582,649 9,884,735 713.7
134.8 136.45 3.72 1.65 582,676 9,884,722 708.6
161 162.5 5.61 1.5 582,699 9,884,711 704.5
BGH030

582554

9884785

732

115

-20

110 111.4 7.24 1.4 582,655 9,884,753 692.2
141.9 152.5 4.85 10.6 582,686 9,884,745 680
158 161.2 3.61 3.2 582,699 9,884,742 675.3
174.45 175.8 11.03 1.35 582,713 9,884,738 670.5
BGH032

582554

9884785

732

125

-20

177 178.72 1.7 1.72 582,692 9,884,684 671.3
182 188.25 3 6.25 582,697 9,884,679 669.1
190.25 193 0.95 2.75 582,702 9,884,676 667.2
194.4 202 1.37 7.6 582,707 9,884,672 665.3
203.5 208 2.67 4.5 582,713 9,884,668 663.2
BGH034

582554

9884785

732

115

-25

174.8 178 11.99 3.2 582,689 9,884,696 653.3
195.7 200 1.21 4.3 582,706 9,884,686 644.8
202.37 206.65 1.86 4.28 582,711 9,884,683 642.3
208 213.3 1.4 5.3 582,716 9,884,680 640.1
216.25 221.3 1.42 5.05 582,722 9,884,676 637.3
225.65 231 0.7 5.35 582,730 9,884,671 634
BGH027

582544

9884822

732

68

-27

212.35 214 0.58 1.65 582,729 9,884,879 634
226 229.3 1.32 3.3 582,741 9,884,883 628.4
235.45 236.58 1.54 1.13 582,749 9,884,885 625.2
BGH028

582554

9884785

732

90

-10

125 126 1.72 1 582,676 9,884,772 700.9
136.1 137.18 1.85 1.08 582,687 9,884,770 698.4
140.28 142 1.03 1.72 582,691 9,884,770 697.4
147.46 151.25 2.88 3.79 582,699 9,884,769 695.5
BGH029

582544

9884822

732

93

-25

126 128.35 4.66 2.35 582,663 9,884,826 678.5
178.9 184.05 1.25 5.15 582,713 9,884,827 657.7
193.7 196.05 3.95 2.35 582,726 9,884,827 653
BGH031

582544

9884822

732

75

-25

208 211.53 0.99 3.53 582,729 9,884,876 639.9
219.4 222.38 1.16 2.98 582,739 9,884,879 636
BGH033

582544

9884822

732

60

-27

259 265.46 7.32 6.46 582,756 9,884,929 612.8
268.53 270.52 1.02 1.99 582,762 9,884,931 610
BGH035

582554

9884785

732

90

-25

152 165 2.96 13 582,686 9,884,816 665
171 173.6 1.47 2.6 582,703 9,884,815 657.4
176.6 180.08 2.4 3.48 582,709 9,884,814 654.9
BGH036

582544

9884822

732

65

0

147.45 151.35 2.31 3.9 582,687 9,884,878 724.8
156.63 160.65 0.93 4.02 582,696 9,884,881 724.7
BGH037

582554

9884785

732

105

-30

154 157 3.81 3 582,680 9,884,741 647.5
194.6 197.55 1.54 2.95 582,712 9,884,730 626
207.95 211.18 1.29 3.23 582,723 9,884,726 619.3
216.25 220.15 2.79 3.9 582,730 9,884,723 615.1
222.4 226.7 1.77 4.3 582,735 9,884,721 612.1
BGH038

582544

9884822

732

75

-30

151.7 154.6 5.22 2.9 582,677 9,884,851 654.3
218.3 223.65 3.38 5.35 582,735 9,884,861 621.4
226.7 231.5 1.95 4.8 582,743 9,884,862 617.6
BGH039

582554

9884785

732

100

-22

112.08 113 2.12 0.92 582665.1 9,884,755 687.6
116.3 120.95 3.33 4.65 582,661 9,884,753 686.1
145 166 2.2 21 582,696 9,884,744 674.2
174.5 176 0.95 1.5 582,713 9,884,739 668.9
BGH040

582544

9884822

732

60

-30

232 233 0.95 1 582,725 9,884,922 618.2
273.7 277.05 3.79 3.35 582,761 9,884,937 600
BGH041 582500 9884847 732 55 -25 340 344.5 3.03 4.5 582,807 9,885,002 599.5
BGH042

582544

9884822

732

60

-35

277.35 280 1.93 2.65 582,751 9,884,922 569.4
308.5 312 0.62 3.5 582,776 9,884,932 552.6
313 315.55 1.52 2.55 582,779 9,884,933 550.5
BGH043

582544

9884822

732

100

-10

102.5 104.15 2.69 1.65 582,644 9,884,808 709
123 124 1.06 1 582,663 9,884,805 704.8
163.64 167 2.82 3.36 582,704 9,884,798 696.7
BGH044 582500 9884847 710 70 -35 330 334.13 1.31 4.13 582,764 9,884,941 533.4
BGH045

582544

9884822

732

100

-20

120.65 121.75 31.55 1.1 582,656 9,884,806 687.4
156 159.4 0.56 3.4 582,689 9,884,799 674.7
176.7 183.62 3.24 6.92 582,708 9,884,795 668.1
BGH046

582544

9884822

732

100

-30

195.18 206 2.85 10.82 582,712 9,884,795 630.5
212.53 215.18 1.9 2.65 582,723 9,884,793 623.7
218 220.6 7.16 2.6 582,728 9,884,792 620.8
225 226 4.36 1 582,733 9,884,791 617.7
BGH047

582565

9884535

718

60

0

121.58 124.57 0.91 2.99 582,653 9,884,879 739.2
147.09 148.09 1.28 1 582,675 9,884,889 741.1
BGH048

582567

9884509

727

90

0

140.75 143.05 0.9 2.3 582,708 9,884,496 727.7
146.53 148 0.74 1.47 582,713 9,884,495 728
BGH049 582565 9884535 718 65 -15 145.4 147.4 4.27 2 582,689 9,884,599 674.5
BGH050 582567 9884509 727 105 -5 160 161.38 1.06 1.38 582,722 9,884,469 711.7
BGH051

582565

9884535

718

40

0

134.8 137 2.23 2.2 582,662 9,884,630 712.3
151 156.3 1.2 5.3 582,675 9,884,642 711.4
164.18 169.45 3.95 5.27 582,685 9,884,651 710.8
171.27 172.57 4.08 1.3 582,688 9,884,655 710.6
BGH052 582567 9884509 727 120 0 205.9 207.1 1.86 1.2 582,732 9,884,385 722.9
BGH053

582565

9884535

718

40

-15

173.73 176.93 9.58 3.2 582,685 9,884,653 669.2
178.55 181.43 4.07 2.88 582,688 9,884,656 667.9
192.41 196.86 3.28 4.45 582,698 9,884,666 664
198.86 206.77 2.45 7.91 582,704 9,884,671 661.8
207.53 209.5 5.04 1.97 582,708 9,884,675 660.3
214.65 216 2.32 1.35 582,713 9,884,680 658.6
BGH054 No significant intercepts
BGH055 582565 9884535 718 80 -15 145 146 0.62 1 582,705 9,884,549 682.7
BGH056 No significant intercepts
BGH057 No significant intercepts
BGH058 582565 9884510 727 95 -5 153.35 155.6 1.98 2.25 582,717.30 9,884,501.20 703.9
BGH059 582567 9884536 718 95 0 165 166 3.63 1 582,732.30 9,884,528.30 714.4
BGH060 No significant intercepts
BGH061 582567 9884536 727 130 -10 157.57 159.19 1.22 1.62 582,719 9,884,525 677.7
BGH062 582567 9884537 718 95 -15 154 156 2.18 2 582,695 9,884,589 650.2
BGH063

582782

9884646

829

270

-70

186.25 194.37 0.82 8.12 582,719 9,884,661 650.5
197.42 202.45 1.12 5.03 582,715 9,884,661 641.8
205 209.05 0.83 4.05 582,712 9,884,661 635.4
211.13 218.9 2.06 7.77 582,709 9,884,661 628.3
220.4 222.55 0.86 2.15 582,706 9,884,661 622.5
231 233 0.87 2 582,701 9,884,661 613
BGH064 582888 9884976 839 270 -50 220.8 222.6 0.63 1.8 582,746 9,884,976 668.9
BGH065

582913

9885057

819

270

-60

271 275.95 2.93 4.95 582,769 9,885,057 586.1
291.56 292.56 1.7 1 582,759 9,885,057 570.9
BGH066

582888

9884976

839

270

-60

276 278.59 8.49 2.59 582,754 9,884,965 596.1
300 301 1.78 1 582,742 9,884,965 576.6
BGH067

582913

9885057

819

270

-67

295.75 300.47 3.21 4.72 582,789 9,885,065 548.1
303 304.62 1.56 1.62 582,786 9,885,065 543.1
337 338 0.55 1 582,769 9,885,068 514.3
BGH068

582913

9885057

819

270

-50

247 248.2 2.1 1.2 582,749 9,885,051 633.1
251.8 255.1 1.75 3.3 582,745 9,885,051 628.8
BGH069 582888 9884976 839 270 -70 321.8 324.73 3.84 2.93 582,779 9,884,962 534.7
BGH070 582913 9885057 819 270 -73 331 336.35 3 5.35 582,802 9,885,040 505.2
BGH071 No significant intercepts
BGH072

582852

9884845

831

270

-67

274.6 279.7 2.7 5.1 582,749 9,884,847 574
290.4 294.8 3.61 4.4 582,742 9,884,847 560
BGH073 582731 9884691 838 280 -60 121 123 0.72 2 582,671 9,884,702 731.9
BGH074

582944

9885130

798

270

-67

278.9 283.93 2.85 5.03 582,810 9,885,137 551.2
285.49 289.1 1.6 3.61 582,807 9,885,138 546.3
294.51 297.3 7.14 2.79 582,802 9,885,139 539.1
299.65 303.34 0.53 3.69 582,799 9,885,139 534.5
BGH075

582731

9884691

838

270

-70

115.4 116.65 6.76 1.25 582,690 9,884,690 729.4
119.5 120.8 15.22 1.3 582,688 9,884,690 725.7
125.09 129.8 3.56 4.71 582,684 9,884,690 719.3
162.55 164.63 8.94 2.08 582,667 9,884,689 687.8
BGH076

582752

9884801

849

300

-40

108 109 0.84 1 582,682 9,884,844 779.6
118.8 119.45 3.71 0.65 582,675 9,884,848 772.7
128.15 131 2.82 2.85 582,668 9,884,852 765.8
136.7 137 0.97 0.3 582,663 9,884,855 761
BGH077

582944

9885130

798

270

-72

316.84 321.2 2.57 4.36 582,830 9,885,130 501.7
323 328.36 2.56 5.36 582,827 9,885,130 495.8
329.06 330.13 0.52 1.07 582,825 9,885,130 492.4
335.25 337.36 9.63 2.11 582,822 9,885,130 486.5
339.77 340.07 7.07 0.3 582,820 9,885,131 483.4
BGH078

582752

9884801

849

280

-40

102 106 1.88 4 582,674 9,884,816 782.6
108 109 0.62 1 582,671 9,884,817 779.7
115 117.15 0.8 2.15 582,665 9,884,818 774.8
BGH079

582852

9884845

831

270

-73

290.15 294.4 1 4.25 582,765 9,884,842 552.6
296.3 302.3 9.46 6 582,763 9,884,841 546.1
304.81 305.7 18.75 0.89 582,761 9,884,841 540.5
312 313 1.08 1 582,758 9,884,841 533.8
316.9 321.63 4.65 4.73 582,755 9,884,840 527.5
322.57 328 5.41 5.43 582,753 9,884,840 522
328.95 329.48 1.59 0.53 582,751 9,884,840 518.4
340.68 341.42 4.29 0.74 582,747 9,884,839 507.6
BGH080

582944

9885130

798

270

-75

339.9 343.6 1.05 3.7 582,853 9,885,141 469.2
345 346.55 4.11 1.55 582,851 9,885,141 465.5
360.7 361 11.95 0.3 582,846 9,885,143 451.5
BGH081a

583022

9885299

776

270

-50

269 274.56 1.99 5.56 582,838 9,885,306 578.6
275.56 275.86 0.64 0.3 582,835 9,885,307 576
BGH082a

583013

9885209

752

270

-50

263.83 266.3 3.43 2.47 582,836 9,885,222 556
268.35 269.15 3.32 0.8 582,833 9,885,223 553.5
276.97 277.27 15.65 0.3 582,827 9,885,224 547.9
BGH083 No significant intercepts
BGH084

583023

9885299

776

270

-57

278.95 280.9 6.25 1.95 582,857 9,885,307 552.8
283.06 286.31 1.28 3.25 582,854 9,885,307 549.2
BGH085 583023 9885299 776 270 -65 294.65 298.35 0.83 3.7 582,890 9,885,304 512.9
BGH086

583013

9885208

752

270

-57

275.35 280.78 3.07 5.43 582,847 9,885,214 530.1
286.05 286.51 18.9 0.46 582,841 9,885,215 524.4
BGH087 583023 9885299 777 270 -75 263.75 264.28 0.59 0.53 582,946 9,885,305 525.0
BGH088

583012

9885208

752

270

-67

297.74 299.46 11.93 1.72 582,876 9,885,221 487.3
301 301.77 6.79 0.77 582,875 9,885,221 485.0
303.7 304 2.47 0.3 582,873 9,885,222 483.0
305.7 306 1.66 0.3 582,872 9,885,222 481.4
307.2 307.55 6.66 0.35 582,871 9,885,223 480.2
308.26 308.93 12.15 0.67 582,871 9,885,223 479.2
309.46 309.77 1.98 0.31 582,870 9,885,223 478.3
310.35 310.68 17.65 0.33 582,869 9,885,223 477.6
313 313.85 2.82 0.85 582,868 9,885,224 475.3
324.48 324.86 5.77 0.38 582,861 9,885,226 466.3
325.43 325.83 10.40 0.4 582,861 9,885,226 465.6
BGH089

582951

9885352

779

270

-50

198 199 4.58 1 582,822 9,885,357 628.9
202.65 203.45 12.25 0.8 582,819 9,885,357 625.5
205.1 205.54 7.96 0.44 582,818 9,885,357 623.7
217.45 218.45 31.90 1 582,809 9,885,358 614.1
BGH090

582951

9885423

769

270

-50

168.8 170.48 2.45 1.68 582,843 9,885,424 638.3
170.88 171.48 12.55 0.6 582,842 9,885,424 637.1
172.97 173.3 5.05 0.33 582,841 9,885,424 635.6
BGH091 582951 9885352 779 270 -65 222.1 223.5 4.02 1.4 582,850 9,885,358 581.3
BGH092 583021 9885430 752 270 -55 193.5 193.88 17.15 0.38 582,913 9,885,431 591.9
BGH093

583013

9885345

759

270

-70

224.25 224.75 4.06 0.5 582,932 9,885,341 549.9
225.8 226.72 1.81 0.92 582,931 9,885,341 548.3
227.7 228.3 2.75 0.6 582,930 9,885,341 546.7
BGH094

582990

9885055

810

270

-65

381 384.81 3.84 3.81 582,808 9,885,054 473.5
389.74 390.25 5.95 0.51 582,805 9,885,054 467.4
408.45 411 5.82 2.55 582,795 9,885,054 450.4
BGH095

582960

9884759

831

270

-60

391.57 399.6 4.56 8.03 582,773 9,884,762 482.7
400 401 1.85 1 582,770 9,884,761 478.6
405 411.97 4.47 6.97 582,766 9,884,761 471.9
414 414.3 1.36 0.3 582,763 9,884,761 467.2
BGH096 No significant intercepts
BGH097

583013

9885345

759

270

-58

242 245.5 1.10 3.5 582,879 9,885,344 555.7
247 250.1 2.66 3.1 582,876 9,885,344 551.8
BGH099 No significant intercepts
BGH100

583013

9885345

759

270

-79

226.76 231.27 2.09 4.51 582,965 9,885,347 535.2
233.08 235 1.58 1.92 582,964 9,885,347 530.3
BGH101

582990

9884975

813

270

-65

387.37 388.62 2.66 1.25 582,802 9,884,968 474.7
392.33 394.68 1.49 2.35 582,799 9,884,968 470.1
396 398.24 0.53 2.24 582,797 9,884,968 467.1
402.74 410.2 3.68 7.46 582,792 9,884,967 459.3
423.64 425.48 13.48 1.84 582,781 9,884,967 444.5
BGH102 No significant intercepts
MND001 No significant intercepts
MND002 No significant intercepts
MND003 No significant intercepts
MND004 583392 9886283 682 270 -52 524.76 525.06 0.67 0.3 582,994 9,886,250 347
MND005 No significant intercepts
MND006 No significant intercepts
MND007 583100 9886210 726 270 -75 402 402.45 0.58 0.45 582,987 9,886,211 340.5
MND009 582881 9886200 752 270 -65 96.35 96.75 2.28 0.4 582,842 9,886,200 667.3
MND010 No significant intercepts
MND011

583103

9886211

726

270

-83

419.26 428 21.85 8.74 583,021 9,886,194 312.7
430.6 438.9 17.52 8.3 583,018 9,886,193 302
MND012 582950 9886140 765 270 -60 64.7 65.35 12.2 0.65 582,916 9,886,142 699.8
MND013

582945

9886142

759

270

-50

142.7 142.98 10.05 0.28 582,852 9,886,146 651.2
177 178 1.02 1 582,829 9,886,146 625.5
MND014 No significant intercepts
MND015a 582950 9886140 755 270 -70 172.32 172.68 6.34 0.36 582,887 9,886,144 594.8
MND016 583063 9886162 741 270 -50 249.42 253 0.62 3.58 582,895 9,886,161 554.1
MND017 583200 9886170 745 270 -50 385 386 1.02 1 582,952 9,886,164 450.4
MND018 583063 9886162 741 270 -60 284.7 285 11.7 0.3 582,912 9,886,160 499.2
MND019

583200

9886170

745

270

-64

432.24 444 25.94 11.76 582,996 9,886,161 357.6
445 445.55 15.3 0.55 582,993 9,886,160 351.6
1. Apparent widths, not true thickness


Appendix 3:


Checklist of Assessment


and Reporting Criteria

Drilling techniques All drillholes were diamond drill cored and drilled from surface (most intersections drilled using NQ size), holes drilled orientated in an east-west direction were angled between -60° and -70°. Holes collared in the west were drilled out in fan patterns into the side of a hill and angled between 0° and minus 35°.
Logging All of the drillholes were geologically logged by qualified geologists. The logging is of an appropriate standard for grade estimation.
Drill sample recovery Core recovery in the mineralised zones was observed to be very good and is on average 97%.
Sampling methods Half core samples were collected continuously through the mineralised zones after being cut longitudinally in half using a diamond saw. Drillhole samples were taken at nominal 1 m intervals, which were adjusted to smaller intervals in order to target the cassiterite vein zones. Lithological contacts were honoured during the sampling. MSA’s observations indicated that the routine sampling was performed to a reasonable standard and is suitable for evaluation purposes.
Quality of assay data and laboratory tests At the on-site ABM laboratory (managed by Anchem), samples were first checked off against the submission list supplied and then weighed and oven dried for 2 hours at 105 degrees Celsius. The dried samples were crushed by jaw crusher to 75% passing 2mm, from which a 250g riffle split was taken. This 250g split was pulverised in ring mills to 90% passing 75μm from which a sample for analysis was taken. Samples were homogenised using a corner-to-corner methodology and two samples were taken from each pulp, one of 10g for on-site laboratory assaying and another 150g sample for export and independent accredited 3rd party laboratory assaying.

Received samples at ALS Johannesburg are checked off against the list of samples supplied and logged in the system. Quality Control is performed by way of sieve tests every 50 samples and should a sample fail, the preceding 50 samples are ground in a ring mill pulveriser using a carbon steel ring set to 85 % passing 75μm. Samples are analysed for tin using method code ME-XRF05 conducted on a pressed pellet with 10% precision and an upper limit of 5,000ppm. The over-limit tin samples are analysed as fused disks according to method ME-XRF15c, which makes use of pre-oxidation and decomposition by fusion with 12:22 lithium borate flux containing 20% Sodium Nitrate as an oxidizing agent, with an upper detection limit of 79% Sn.

Prior to the 2021 drilling the assays were also conducted at ALS Global in Johannesburg where samples were analysed for tin using fused disc ME-XRF05 with 10% precision and an upper limit of 10 000 ppm. This was reduced to 5,000 ppm from 2014 onwards. Over limit samples were sent to Vancouver for ME-XRF10 which uses a Lithium Borate 50:50 flux with an upper detection limit of 60% and precision of 5%.

ME-ICP61, HF, HNO3, HCL04 and HCL leach with ICP-AES finish was used for 33 elements including base metals. ME-OG62, a four-acid digestion, was used on high grade samples for Pb, Zn, Cu & Ag.

External quality assurance of the laboratory assays for the Alphamin samples was monitored. Blank samples (223), certified reference materials (310) and duplicate samples (277) were inserted with the field samples accounting for approximately 11% of the total sample set.

The QAQC measures used by Alphamin revealed the following:

  • Blank samples indicated that no significant contamination occurred overall. Low levels of contamination (mostly <200 ppm Sn) mostly occurred, however 9 values between 229 ppm and 1,285 ppm were returned. Given the high grades at Bisie, the levels of contamination are not significant.
  • Five different CRMs were used with expected values between 0.18% and 31.42% Sn. The lower grade CRMs were prepared by Ore Research and Exploration (OREAS) and the two high grade CRMs (4.19% and 31.42% Sn) by the Bureau of Analysed Samples Ltd (BCS). In general, ALS returned values within the tolerance limits (three standard deviations) for the OREAS CRMs, although slightly lower than the expected value. Assays of the highest grade BCS CRM were mostly outside of the three standard deviation limits but within ±4%of the expected value. The update assays of the high grade BCS-355 CRM were within ±6% of the expected value with no overall bias relative to the CRM expected value. For the 5.07% Sn BCS CRM, assays were consistently lower than the expected value by as much as 7%. This trend continued for the update assays with an average under-assay of 7% relative to the CRM expected value. Overall, the CRMs results indicate a slight negative bias for the ALS assays.
  • Coarse duplicates show mostly excellent correlation, indicating minimal error in the process and a high degree of repeatability.
Verification of sampling and assaying The mineralisation in thirteen of the drillholes completed in 2021 at Mpama South were visually verified during a site-visits by the QP in August 2021 and several of the initial drillholes were examined during earlier site visits to Bisie. The QP observed the mineralisation in the cores and compared it with the assay results. It was found that the assays generally agreed with the observations made on the core. Core photos from the drilling programme have regularly been provided to the QP for inspection.

105 pulp duplicates were sent to SGS (Johannesburg) in November 2021 for confirmation assaying.

  • The pulp duplicates showed acceptable correlation with the ALS assays at both high- and low-grade ranges with an overall bias of near zero.

    • Average bias for grade ranges > 1% is less than 1%.
    • Tendency for ALS to be higher (~5%) for the grade ranges less than 1%.
  • Inter-lab precision (after removal of <0.10%) is 85% within 10% error and 95% within 20% error
Location of data points The drillhole collar positions were surveyed using a differential GPS.

Downhole surveys were completed using a multishot down-hole survey instrument (Reflex EZ-Track), or north seeking gyro (Reflex EZ-Gyro / Reflex Gyro Sprint-IQ).

Tonnage factors (in situ bulk densities) Relative density measurements were made on the majority of recent drillhole samples using the Archimedes Principle of weight in air versus weight in water. A regression formula of tin grade against relative density was developed and applied to the samples that did not have direct measurements. The assigned specific gravity was interpolated into the block model using ordinary kriging.
Data density and distribution A total of 107 holes were drilled in Mpama South. Holes were drilled steeply from east to west, along section lines spaced approximately 60 m to 80 m apart. Several sets of holes were drilled in a fan pattern into the side of a steep hill, with orientations spanning from the northeast to the southeast (from azimuth 045° to 125°). These drillholes fans intersect the mineralisation 25 m to 40 m apart in most of the Mineral Resource area.
Database integrity Data was provided as Excel files. MSA completed spot checks on the database and is confident that the Alphamin database is an accurate representation of the original data collected.
Dimensions The mineralisation consists of seven zones, with a total extent of 1 110 m along strike. The two main zones are MZ1 which has a strike length of 900 metres and 350 m down-dip and MZ2, with a strike length of 650 m and 350 m down-dip, accounting for 88% of the Mineral Resource.

The zones occurring in the footwall and hangingwall of the MZ1 and MZ2 tend to be narrower and irregular in shape with strike lengths from 100 m to 300 m. MZ6, which is located to the south has a strike length of 270 m and a dip length of 110 m.

Geological interpretation The mineralised intersections in drill core are clearly discernible. The Mineral Resource is interpreted to occur as irregular tabular mineralised zones, dipping 65-70° to the east, containing several narrow veins and disseminations of cassiterite. The mineralised zones are hosted in chlorite schist that is the result of intense hydrothermal alteration associated with a fracture system.

The two main zones of the Mineral Resource (MZ1 and MZ2) are continuous for almost 900 m, with average thicknesses of 4.1 m and 3.4 m respectively. However, the thicknesses of these two zones vary from as little as 1 m, up to 14 m thick.

Three smaller zones (MZ3 to MZ5) occur in the footwall of the main mineralisation which progressively become narrower, moving away from the main zone. MZ3 thickness ranges from 1 m to 9 m with an average thickness of 1.5 m. MZ4 has an average thickness of 1 m, attaining a maximum thickness of 5 m. MZ5 has an average thickness of 1.2 m, ranging from 1 m to 5 m. All zones become narrower along the edges, where they pinch-out.

A small, narrow zone (MZ7) occurs in the hangingwall of the main mineralisation with an average thickness of 0.5 m and a maximum thickness of 4 m.

MZ6, which occurs to the south, tends to be lower in grade and has an average thickness of 4 m, ranging from 1 m up to 9 m.

A three-dimensional wireframe model was created for the seven zones of mineralisation based on a grade threshold of 0.40% Sn. The MZ1 and MZ2 make up the main zone, which are the most consistent zones and occur within a persistent chlorite schist. Narrower less continuous zones occur above and below the main zone within chlorite-mica schists.

Domains The mineralisation was modelled as seven tabular zones containing irregular vein style mineralisation. A hard boundary was used to select data for estimation in order to honour the sharp nature of vein boundaries.
Compositing Sample lengths were composited to 1 m by length and density weighting.
Statistics and variography Statistics for the seven estimation domains show distributions that are positively skewed with coefficients of variation (CV) ranging from 1.33 to 1.97, the only exception being domain MZ7 which shows lower variability due to very few composites resulting in a CV of 0.79.

The two main zones (MZ1 and MZ2) have similar average tin grades (2.30% and 2.07% respectively). The smaller, footwall zones (MZ3 to MZ5) are higher in tin grade with averages ranging from 2.4% to 4.11% while MZ6 and MZ7 are lower in tin grade, with an average of 0.57% and 1.05% respectively.

Normal Scores semivariograms were calculated in the plane of the mineralisation, down-hole and across strike. Variograms were modelled for tin, with a range of 40 m within the plane of mineralisation and with a range of 3 m across the structures.

Top or bottom cuts for grades Top caps were applied to outlier values, identified as breaks in the cumulative, probability plots.
Data clustering Data clustering occurs where the fan drilling, collared on the western side of the deposit, intersect the surface drilling collared in the east, resulting in a data spacing of 25 m to 40 m towards the centre of the deposit. Outside of this area, the grid spacing becomes more regular, 60m to 80 m along strike and 50 m down-dip.
Block size A rotated block model with a parent cell of 10 mX by 10 mY by 2 mZ was used. Sub-celling was used to divide the parent cells to a minimum sub-cell of 1 mX by 1mY by 0.2 mZ to closely fit the narrow portions of the vein structures
Grade estimation Tin, copper, lead, zinc, silver, arsenic and density were estimated using ordinary kriging. A minimum number of 5 and a maximum of 10 one metre composites were required for the tin and density estimates. A minimum of 5 and maximum of 8 composites were used for the other elements.

Estimation was carried out in three passes, with the first pass using search volumes coinciding with the variogram ranges. A second pass estimate expanded the search volumes by a factor of 1.5 to estimate blocks where insufficient samples were present for an estimate in the first pass. Where blocks remained un-estimated from the first two passes, a third pass, using an expansion factor of 10 was used to ensure all blocks in the model received a grade and density estimate.

Dynamic Anisotropy was used to orientate the search volumes to the strike and dip of the individual mineralised zones.

Resource classification Indicated Mineral Resources were declared where the drillhole spacing is approximately 40 m and where the geological model has low variability. The remainder of the interpreted model was classified as Inferred Mineral Resources, corresponding to areas informed by drilling spaced 50 m to 80 m apart with a maximum extrapolation of 20 m from the nearest drillhole.
Mining cuts and cut-off grade assumptions. A minimum of 1 m was applied to the mineralisation model. The thickness, grade and steep dip implies that the Mineral Resource can be extracted using established underground mining methods similar to those applied at Mpama North.

A 1% cut-off grade was applied based on the Mpama North costs and prevailing tin price.

Isolated blocks above cut-off grade in dominantly low-grade areas of the model were not included in the Mineral Resource

Metallurgical factors or assumptions The tin mineralisation occurs as cassiterite, an oxide of tin (SnO

2

). At Mpama North gravity separation is used to produce a tin concentrate. The Cu, Zn and Pb mineralisation occurs as sulphides, which are removed by flotation to create the cassiterite product. It is assumed that similar processes will be used to process the Mpama South mineralisation.
Legal aspects and tenure Alphamin through its wholly owned DRC subsidiary, Alphamin Mining Bisie SA, has a Mining License PE 13155 which includes the Bisie Tin Mine. Alphamin has an 84.14 percent interest in ABM. The Government of the Democratic Republic of Congo (GDRC) has a non-dilutive, 5% share in ABM.
Audits, reviews and site inspection The following review work was completed by MSA:

  • Inspection of approximately 20% of mineralised core intersections used in the Maiden Mineral Resource estimate.
  • Database checks.
  • Inspection of Mpama South drill sites in August 2021.
  • On-site review of the exploration processes.
  • Laboratory inspections.



1

Data obtained from International Tin Association Tin Industry Review 2020.


2

This is a non-GAAP financial measure, is not standardized and may not be comparable to similar financial measures of other issuers. See “Use of Non-IFRS Financial Performance Measures” below for a further explanation of this performance metric and how it is calculated.


3

Data obtained from Preliminary Economic Assessment study announced on 7 March 2022.


4

CIM Definition: An Indicated Mineral Resource is that part of a Mineral Resource for which quantity, grade or quality, densities, shape and physical characteristics are estimated with sufficient confidence to allow the application of Modifying Factors insufficient detail to support mine planning and evaluation of the economic viability of the deposit.


5

CIM Definition: An Inferred Mineral Resource is that part of a Mineral Resource for which quantity and grade or quality are estimated on the basis of limited geological evidence and sampling. Geological evidence is sufficient to imply but not verify geological and grade or quality continuity.


Primary Logo