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Burkina Faso
Perkoa Mine

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 Location:
29 km NW from Koudougou, Burkina Faso

  Regional Office:
Av. Houari Boumedienne-, Immeuble Pharmacie Koulouba, 11BP, Ouga, 1527 CMS
Ouagadougou
Burkina Faso
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Fax+226-50-33-19-50
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Zinc
Mining Method
  • Longhole stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
Production Start...
Mine Life4.8 years (as of Jan 1, 2018)
Perkoa operations remain suspended following the April 16th flooding event that resulted in eight fatalities and the suspension of mining and milling operations. Costs related to the flooding event for Q2 amount to $15.2 million. Operating cost and production guidance at Perkoa remain suspended.


Owners

Source: p. 31-32
CompanyInterestOwnership
Government of Burkina Faso 10 % Indirect
Trevali Mining Corp. 90 % Indirect
Ownership Tree
Trevali is the indirect owner of 90% of the shares in the capital of Nantou Mining Burkina Faso S.A. (“Nantou Mining”), 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.

Contractors

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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 len ........


Mining Methods

  • Longhole stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill


Summary:

The Perkoa mine is an underground operation, however, a small open pit was mined to reach near surface material during initial start-up to increase plant throughput as the underground mine ramped up production. The pit is now complete. Underground mining with contractors carrying out all aspects of the mining process commenced in February 2013.

The mine is accessed via an 85 m long decline in the box cut prior to entering the portal.

The decline and associated cross cuts are excavated in the competent quartz diorite of the footwall. The 5.3 m wide x 5.5 m high decline is a spiral and the level spacing is set at 30 m. Each level is identical with a footwall drive, sumps, and services cubbies.

A ventilation shaft connects all levels of the mine and acts as an emergency egress via the inking bucket (kibble). A further secondary ventilation ramp egress exists into the completed open pit to allow personnel to escape on foot in an emergency situation. A 35 m crown pillar has been maintained between the open pit and underground production workings.

Longhole stoping is being used as the primary extraction method. There are several variations on this mining method employed such as longitudinal and transverse, with both bottom-up and top-down mining sequences. The exact method chosen is dependent on the orebody geometry. Stopes are backfilled with either cemented rock fill (CRF) or waste.

Longitudinal bottom-up stoping has been u ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Zinc Payable metal M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required184
Zinc Concentrate kt 197171154
Zinc Metal in concentrate M lbs 204180
^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required751,681 t708,263 t721,503 t580,411 t
Tonnes milled  ......  Subscription required  ......  Subscription required739,849 t724,995 t657,933 t590,083 t
Daily milling capacity  ......  Subscription required  ......  Subscription required2,000 t2,000 t2,000 t1,900 t
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Reserves at December 31, 2021:
The Perkoa Underground Mine Mineral Reserve estimate is reported based on planned stopes with a net smelter return cutoff value of $90/tonne, with an average zinc price of $1.39 per pound.
The Perkoa Underground Mine Mineral Resource estimate is reported based on a cut-off grade of 5% zinc equivalent.

CategoryTonnage CommodityGradeContained Metal
Proven 0.73 Mt Zinc 11.31 % 181 M lbs
Probable 0.23 Mt Zinc 9.45 % 48 M lbs
Proven & Probable 0.96 Mt Zinc 10.86 % 229 M lbs
Measured 1.51 Mt Zinc 12.72 % 424 M lbs
Indicated 1.2 Mt Zinc 9.48 % 251 M lbs
Measured & Indicated 2.71 Mt Zinc 11.29 % 675 M lbs
Inferred 0.47 Mt Zinc 8.51 % 88 M lbs

Commodity Production Costs:

CommodityUnits202220212020201920182017
All-in sustaining costs (AISC) Zinc USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.91 / lb   1.02 / lb  
C1 cash costs Zinc USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 0.8 / lb   0.91 / lb  
^ Guidance / Forecast.
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Operating Costs:

Units201920182017
Total operating costs ($/t milled) USD 96105114.39

Financials:

Units20222021202020192018
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 20.9  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 162.5  
EBIT M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.7  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 27.2  
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Heavy Mobile Equipment as of December 31, 2017:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required 102 mm ....................... Subscription required
Scoop Tram ....................... Subscription required
Truck (haul) 60 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 26, 2022
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Staff:

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

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Technical Report 2017
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