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Burkina Faso
Bouly Mine (Bissa-Bouly Operation)

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 Location:
87 km N from Ouagadougou, Burkina Faso

  Regional Office:
11 BP 1229 CMS OUAGA 11 783 Rue de la Chambre de Commerce
15 618 commune de Ouagadougou Ouaga 2000
Ouagadougou
Burkina Faso
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption
  • Cyanide (reagent)
Mine Life10 years (as of Jan 1, 2020)


Owners

Source: p. 129, 130
CompanyInterestOwnership
Government of Burkina Faso 10 % Indirect
Nord Gold plc 90 % Indirect
Bissa Gold SA (operator) 100 % Direct
Bissa Gold SA, which owns the Bouly mine, is 90% owned by Nordgold through High River Gold Mines Ltd. and 10% state owned (under law).

Deposit Type

  • Porphyry
  • Vein / narrow vein


Summary:

The Bissa and Bouly gold deposits all occur within an approximate 90 km NW-SE zone, comprising Birimian volcano-sedimentary rocks of the Boromo greenstone belt. The belt consists of mafic volcanic rock, minor felsic volcanic rock and extensive sedimentary units, intruded by Eburnean granitoids, all of which have undergone incipient to low greenschist facies metamorphism (Huot and Sattran, 1987).

The Bouly deposit, approximately 9 km east of the Bissa-Zandkom corridor, is hosted by shear zones within metamorphosed metavolcanics, diorites and porphyritic diorites. The volcanosedimentary sequence is well foliated, with a NE-SW striking fabric. The meta-volcanics are intruded, and mostly replaced, by later diorite, granodiorite and porphyritic diorite bodies, which are not well foliated except in areas where extensive shearing has occurred. As per the BokenZandkom corridor, two phases of deformation are recognised. The earliest deformation phase is associated with NW striking, moderately SW dipping thrust structures. The second deformation phase is associated with NE striking, steeply SE dipping strike slip structures.

Mineralisation at the Bissa and Bouly deposits is primarily orogenic and structurally controlled, with a secondary lithological control. The most significant mineralised zones are associated with anastomosing networks of quartz and quartz-carbonate veins (or stacked, parallel “arrays” of veins) developed within major brittle-ductile shear zones.

Gold mineralisation is most commonly developed in either quartz-sulphide veining ± carbonates and tourmaline, or disseminated and fracture filling sulphides and magnetite. Across most deposits, the primary sulphide species is pyrite, with minor chalcopyrite and arsenopyrite and very rare native gold.

As is typical in the region, the Bissa and Bouly deposits are variably oxidised. The oxidation sequence typically comprises a thin (0 to 20 m) lateritic layer at surface, which overlies a welldeveloped oxidised saprolitic zone. This normally progresses into a transitional zone, comprising a mixture of saprolite and fresh bedrock, with un-altered fresh rock typically around 50 m to 125 m below surface. Secondary enrichment of gold within the laterite layer is common.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Bouly operation extracts material from multiple open pits. The ore is hauled to the heap leach pads, while the waste is hauled to the waste dumps.

Production is undertaken through conventional drilling, blasting, loading and hauling processes.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 2
Cone crusher ....................... Subscription required 2

Summary:

Ore is crushed to a target 100% -45 mm 80% -21 mm using two parallel trains, each train consisting of a single Metso C140 jaw crusher, preceded by a vibrating grizzly with a nominal 102 mm aperture, followed by a single Metso HP800 cone crusher preceded by a double deck screen with apertures 80 mm and 25 mm.


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption
  • Cyanide (reagent)

Source: Subscription required

Summary:

The Bouly process plant treats low grade non-refractory oxidised saprolite and transitional saprock hosted gold ore by heap leaching, with gold doré produced at the Bissa plant. The plant commenced production in 2016 with a design production rate of 7.5 Mtpa of ore.

Heap Leaching
Cement is added from storage soils to the crushed ore at a typical rate of 10 kg/t, and the ore is then agglomerated using a 4.6 m diameter, 14.0 m long agglomeration drum, to which is added barren leach solution at a nominal rate of 115 L/t of ore. The ore is then transported to the leach pad using a series of overland conveyors, feeding onto mobile grasshopper conveyors and finally to a radial stacker. The lift height is 10 – 12 m and the pads are designed to ultimately consist of four lifts with potential to stack up to six lifts being investigated. An interlift liner and drainage are installed for each lift. Leach solution is applied using wobbler sprinklers. The nominal leach cycle is 150 ........

Recoveries & Grades:

CommodityParameter202120202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required79.379.983
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.590.610.57
^ Guidance / Forecast.

Production:

CommodityUnits202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required10712428
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined  ......  Subscription required  ......  Subscription required13,794 kt13,262 kt12,921 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required11,385 kt9,860 kt8,721 kt3,518 kt
Waste  ......  Subscription required  ......  Subscription required2,409 kt3,403 kt4,200 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required0.2 0.3 0.5 1.46
Tonnes processed  ......  Subscription required  ......  Subscription required7,441 kt7,741 kt7,385 kt3,292 kt of ore
Annual processing capacity  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Cut-off grade for resources is 0.23 g/t Au.
Cut-off grades for reserves are variable.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (OP) 15.552 Mt Gold 0.5 g/t 241 koz
Probable Stockpiles 12.173 Mt Gold 0.3 g/t 126 koz
Probable In-Situ (OP) 39.505 Mt Gold 0.5 g/t 589 koz
Probable Total 51.678 Mt Gold 0.4 g/t 715 koz
Proven & Probable Stockpiles 12.173 Mt Gold 0.3 g/t 126 koz
Proven & Probable In-Situ (OP) 55.057 Mt Gold 0.5 g/t 831 koz
Proven & Probable Total 67,230 Mt Gold 0.4 g/t 957 koz
Measured In-Situ (OP) 21.269 Mt Gold 0.49 g/t 338 koz
Indicated Stockpiles 12.173 Mt Gold 0.32 g/t 126 koz
Indicated In-Situ (OP) 158.766 Mt Gold 0.51 g/t 2,584 koz
Indicated Total 170.939 Mt Gold 0.49 g/t 2,710 koz
Measured & Indicated Stockpiles 12,173 Mt Gold 0.32 g/t 126 koz
Measured & Indicated In-Situ (OP) 180.035 Mt Gold 0.5 g/t 2,922 koz
Measured & Indicated Total 192,208 Mt Gold 0.49 g/t 3,048 koz
Inferred In-Situ (OP) 117.907 Mt Gold 0.51 g/t 1,930 koz
Total Resource Stockpiles 12,173 Mt Gold 0.32 g/t 126 koz
Total Resource In-Situ (OP) 297.942 Mt Gold 0.51 g/t 4,853 koz
Total Resource Total 310,115 Mt Gold 0.5 g/t 4,978 koz

Commodity Production Costs:

CommodityUnits202120202019
Total cash costs Gold USD  ......  Subscription required ^
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20202019201820172016
Processing costs ($/t milled) USD 5.274.784.744.923.15

Financials:

Units202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required10.8   11.9   6.2  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required24.1   11.9   92.8  
Revenue M USD  ......  Subscription required  ......  Subscription required133.5   156.2   26.6  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 1, 2021:
HME TypeModelSizeQuantity
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required
Truck (haul) ....................... Subscription required 90 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
....................... Subscription required ....................... Subscription required Subscription required Apr 5, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Press Release 2018
Annual Report 2017
Press Release 2017
Integrated Report 2016
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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