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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

StageProduction
Mine TypeUnderground
Commodities
  • Zinc
Mining Method
  • Longhole stoping
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
Processing
  • Flotation
Mine Life4.8 years (as of Jan 1, 2018)
Latest NewsTrevali Announces Preliminary Q4-2020 Production Results and Provides 2021 Production and Cost Guidance     January 18, 2021


Owners & OPERATOR

Source: p. 50
CompanyInterestOwnership
Byrnecut Offshore Pty. Ltd. (operator)
Trevali Mining Corp. 90 % Indirect
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.

Deposit Type

  • VMS
  • Vein / narrow vein


Summary:

The Perkoa deposit has been classified as a volcanogenic massive sulphide (VMS) deposit (Billiton, 1998). VMS deposits are lenses and sheets of massive sulphide that form from seafloor hydrothermal systems where metal rich fluids (black smoke) precipitate on (exhalative) or near the seafloor (sub seafloor replacement.).

The Footwall Lens is the thickest (up to 25 m to 30 m) and most continuous of all the lenses. The Footwall Lens typically has higher zinc grades than that of the Hanging Wall Lenses. The Footwall Lens is composed of coarse grained sphalerite and pyrite of approximately the same proportions (around 20% to 25%) as the Hanging Wall Lenses with minor content of pyrrhotite, plus locally valuable galena associated with silver, however, with generally lesser amounts than the Hanging Wall Lenses. A large proportion of barite (up to 15%) is a common constituent of the gangue. In the upper northeastern area of the deposit, the Footwall High Grade Lens has grades in excess of 50% Zn at the contact of the sulphide lens and granodiorite pluton. Average zinc grades in the footwall are more in the region of 9% to 15 % Zn.

The Hanging Wall Lenses are typically thinner than the Footwall Lens and represent more interbedded features of massive, vein type, or disseminated VMS together with tuffaceous material along the same geological horizon. In these lenses, the pyrite and pyrrhotite content is higher than that of the Footwall Lens, while barite content is lower and almost no lead and silver are present. Due to the interbedded and disseminated nature of the Hanging Wall Lenses, they are typically of lower average zinc grade, however, they are found to have some enriched zones in proximity to fault zones and/or the footwall granitic pluton. At depth, the Hanging Wall Lenses thicken up to 15 m in width.


Mining Methods

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


Summary:

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 either with cemented rock fill (CRF) or waste rock.

Longitudinal bottom-up stoping has been used above 190 level. Due to the orebody width and mine sequencing, stopes between the 190 level and the 280 level are mined using the transverse method with primary and secondary stopes, with some longitudinal retreat mining occurring at the extremities of the orebody. Most of the primary stopes above the 280 level have been mined out with the majority of the remaining ore to be mined as secondary stopes. A recoverable sill pillar is being established on 310 level in order to be able to convert the mining below 310 level to a longitudinal retreat method, which is expected to reduce the amount of development required. As well, a higher percentage of waste backfill instead of CRF can be used with this method, which is expected to lower the mining cost. Bottom-up mining will be utilized between the 340 level and the 430 level and top-down longitudinal retreat will be utilized between the 460 level and the 520 level.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The process plant at Perkoa is a conventional sulphide flotation plant capable of processing 2,000 tpd and is currently operating at approximately 1,900 tpd. The process plant includes crushing, screening, and grinding, followed by zinc flotation and filtering to produce a zinc concentrate. The process plant originally included a lead recovery circuit, however, this circuit is no longer used and has been reconfigured to increase capacity in the zinc circuit due to higher zinc head grades.

The ROM ore is fed through a grizzly to the primary jaw crusher at a rate of approximately 150 tonnes per hour (tph). The product is sent to a secondary cone crusher circuit operating in closed circuit with a screen, splitting at 10 mm. The screen oversize (+10.0 mm) is sent to the cone crushers. Product from the cone crushers is returned to the primary screen. The undersize (-10.0 mm) from the primary screen is sent to the mill feed stockpile.

From the mill feed stockpile, t ........

Recoveries & Grades:

CommodityParameter2019201820172016201520142013
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Head Grade, % 14.314.915.2151513.66.33
Zinc Concentrate Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018201720162015
Zinc Payable metal M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required
Zinc Concentrate dmt  ......  Subscription required170,707153,715130,269
Zinc Metal in concentrate M lbs 204180152
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required580,411 t551,814 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required590,083 t513,283 t495,651 t
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,900 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 0.67 Mt Zinc 14.54 % 213 M lbs
Probable 1.4 Mt Zinc 11.96 % 368 M lbs
Proven & Probable 2.06 Mt Zinc 2.06 % 581 M lbs
Measured 1.68 Mt Zinc 14.6 % 542 M lbs
Indicated 2.72 Mt Zinc 11.42 % 685 M lbs
Measured & Indicated 4.4 Mt Zinc 12.64 % 1,223 M lbs
Inferred 0.81 Mt Zinc 8.71 % 155 M lbs

Commodity Production Costs:

CommodityUnits2020201920182017
All-in sustaining costs (AISC) Zinc USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 1.02 / lb
C1 cash costs Zinc USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 0.91 / lb
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

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

Financials:

Units20192018
Sustaining costs M USD  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
EBIT M USD  ......  Subscription required  ......  Subscription required
EBITDA M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2017:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required 102 mm 1
Scoop Tram 3
Truck (haul) 60 t 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 13, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
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
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Technical Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Trevali Announces Preliminary Q4-2020 Production Results and Provides 2021 Production and Cost Guidance January 18, 2021
Trevali Announces Drill Results For the Newly Discovered T3 Horizon at the Perkoa Mine and Updates on Regional Exploration and the Hanging Wall Lens Infill Programs December 2, 2019

Aerial view:

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