Burkina Faso

Perkoa Mine

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Overview

Mine TypeUnderground
StatusCare and Maintenance
Commodities
  • Zinc
Mining Method
  • Longhole stoping
  • Longitudinal stoping
  • Transverse stoping
Backfill type ... Lock
Production Start... Lock
SnapshotAll operations have been suspended as a result of the flooding event at the Perkoa mine on April 16, 2022.

Trevali Mining Corporation announced that its 90%-owned subsidiary Nantou Mining Burkina Faso S.A. has filed an application for liquidation with the Judicial Tribunal of Commerce in Burkina Faso. A liquidator has been appointed by the Judicial Tribunal. The liquidator has assumed responsibility for the management of the affairs of Nantou Mining and Trevali no longer exercises operational control over Nantou Mining or the Perkoa mine.

On June 30, 2023, Trevali Mining Corporation announced that the Supreme Court granted an order in the Company's ongoing CCAA proceedings pursuant to which FTI Consulting Canada Inc., the Court appointed "Monitor", has been granted enhanced powers in the CCAA Proceedings with respect to the Company's business and affairs.

The Monitor's powers to manage the Company, the remaining employees have ceased their employment with the Company.

Owners

SourceSource
CompanyInterestOwnership
Government of Burkina Faso 10 % Indirect
Trevali Mining Corp. 90 % Indirect
Trevali Mining, which owned and operated the Perkoa zinc mine, filed for bankruptcy in August 2022.

Trevali is the indirect owner of 90% of the shares in the capital of Nantou Mining Burkina Faso S.A., the entity that owns the Perkoa Mine. The remaining 10% of Nantou Mining is owned by the Government of Burkina Faso, in accordance with the Burkina Faso Mining Law.

On November 14, 2022, Trevali Mining Corporation ("Trevali" or the "Company") announced that further to the October 6, 2022 press release of the Company, the Judicial Tribunal of Commerce in Burkina Faso has granted an order providing for the liquidation of the Company's 90%-owned subsidiary Nantou Mining Burkina Faso S.A. ("Nantou Mining"). A liquidator has been appointed by the Judicial Tribunal. The liquidator has assumed responsibility for the management of the affairs of Nantou Mining and Trevali no longer exercises operational control over Nantou Mining or the Perkoa mine.

Deposit type

  • VMS

Summary:

The Perkoa deposit lies in a felsic to intermediary series of volcanic and volcaniclastic rocks, within the Paleoproterozoic Birimian Supergroup of West Africa. The prospective Birimian-aged rocks in Burkina Faso are the same sequences that host major gold deposits in Burkina Faso and in the neighbouring countries of Ghana and Mali. The Birimian Supergroup of West Africa is renowned for their gold mineralization; however, known occurrences of base metals are scarce. The Perkoa deposit represents the only significant zinc-silver massive sulphide mineralization discovered in the Birimian to date and it is also the first zincsilver massive sulphide mineralization discovered in this region. Only zinc is being recovered at the Perkoa Mine.

The Perkoa deposit has been classified as a volcanogenic massive sulphide (“VMS”) deposit. VMS deposits are lenses and sheets of massive sulphide that form from seafloor hydrothermal systems where metal rich fluids precipitate on (exhalative) or near the seafloor (sub-seafloor replacement.). The Perkoa mineralization occurs as a series of stacked, northeast-southwest striking tabular VMS lenses hosted, and separated by, tuffaceous material that has been overturned with an average dip of approximately 70°. The deposit is unusual for its high concentrations of zinc and barium mineralization, and relatively low levels of lead and copper. Mineralization occurs within two continuous VMS lenses, the main Perkoa lens and the Hanging Wall lens. The main lens outcrops on surface and extends to a depth of approximately 620 metres below the topographic surface, characterized by a strike length that varies between 300 and 470 metres with a width that varies between 5 metres to 25 metres. The Hanging Wall lens extends from approximately 100 metres below the topographic surface down to a depth of approximately 820 metres with a strike extension that varies between 250 metres to 350 metres. Thickness of the Hanging Wall lens is narrower than the Main lens, varying from 5 metres to 15 metres.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

All production and cost data for 2022, are given for the first two quarters of the year, following the Perkoa flooding event on April 16, 2022 that resulted in the suspension of all operations to date.
CommodityProductUnits20222021202020192018201720162015
Zinc Payable metal M lbs  ....  Subscribe  ....  Subscribe  ....  Subscribe180184
Zinc Metal in concentrate M lbs 204180152

Operational metrics

Metrics20222021202020192018201720162015
Ore tonnes mined  ....  Subscribe  ....  Subscribe  ....  Subscribe751,681 t708,263 t721,503 t580,411 t551,814 t
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe739,849 t724,995 t657,933 t590,083 t513,283 t
Daily milling capacity  ....  Subscribe  ....  Subscribe  ....  Subscribe2,000 t2,000 t2,000 t1,900 t

Production Costs

CommodityUnits202220212020201920182017
Total cash costs Zinc USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 0.88 / lb   0.8 / lb   0.91 / lb  
All-in sustaining costs (AISC) Zinc USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 0.94 / lb   0.91 / lb   1.02 / lb  

Operating Costs

Currency201920182017
Total operating costs ($/t milled) USD 96  105  114.39  

Financials

Units20222021202020192018
Sustaining costs M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 7.1   20.9  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 152   162.5  
EBIT M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe -4.8   -0.7  
EBITDA M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 30.9   27.2  

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 3, 2024

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2021
...... Subscription required ...... Subscription required ...... Subscription required 2020
...... Subscription required ...... Subscription required ...... Subscription required 2019
...... Subscription required ...... Subscription required ...... Subscription required 2018
...... Subscription required ...... Subscription required ...... Subscription required 2017

Aerial view:

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