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Burkina Faso
Bissa-Bouly Operation (Bissa Mine, Bouly Mine)

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 Location:
88 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
Burkina Faso
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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
Production Start...
Mine Life9 years (as of Jan 1, 2020)
Bissa and Bouly are open-pit gold mines located in Burkina Faso, West Africa with CIL and heapleaching technologies for gold processing.


Owners

Source: p. 90
CompanyInterestOwnership
Government of Burkina Faso 10 % Indirect
Nord Gold plc 90 % Indirect
Bissa Gold SA (operator) 100 % Direct
Nord Gold plc. owns 90% interest in the Bissa and Bouly mines through Bissa Gold SA and the remaining 10% is owned by the government of Burkina Faso.

Contractors

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Deposit Type

  • Porphyry
  • Vein / narrow vein
  • Orogenic


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 Bissa Hill, SW, IOSE, Z51, Z52 and Boken Zandkom deposits all fall within an approximate 9km NE-SW oriented corridor (“the Bissa-Zandkom corridor”) in the northeastern portion of the Boromo greenstone belt. This corridor comprises a series of interbedded argillaceousarenaceous sediments, alongside sequences of mafic volcanic rock. The thick metasedimentary sequence represents the principal host to mineralisation. Structurally, the lithological assemblage at Bissa-Zandkom appears to be tightly folded, with a broad NE to ENE trend, and is offset by several large-scale faults that trend NW-SE. At least two phases of deformation can be identified at the mine-scale, including an earlier D1 and later D2, resulting in a re-folded fold sequence. Bouly, which lies to the southeast of Bissa, appears to represent a large, low grade gold-copper porphyry. 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 strik ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The operation envisages open pit mining, utilising drill & blast with a truck and shovel approach to ore and waste haulage. Mining – Bissa Mining operations at Bissa are focused on a number of different open pits. Bissa gold mine operates a typical modern open pit operation with drilling and blasting followed by load and haul allowing for selective mining of the ore. The material lithologies are divided into four main categories: Laterite, Saprolite, Transition, and Fresh. Fleet capacity is sufficient, with only rebuilding and some replacement capital necessary during the LoM. There are currently 39 trucks with a payload of 100 t that are used for production from the open pits. Assumed cycle times average 24 minutes. The mine has several significant opportunities to extend the LoM but this will depend on the exploration program and the gold price. The ramps have been designed at a gradient of 10% at 23 m width. The mining benches are between 8 m and 16 m high and are loaded out in 4 m fletches. Mining – Bouly 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. There are currently 16 CAT 777 90 t haul trucks at Bouly which are shared with the Bissa operation. There are two PC2000s and two CAT6015s at Bouly, and CAT 993 front-end loaders (“FEL”) are used on the stockpiles. ........


Crushing and Grinding

BISSA
Crushing
RoM ore is screened at 800 mm on a stationary grizzly, with oversized broken using a rockbreaker. The primary crusher is a Metso C140 jaw crusher operating with a nominal CSS of 170 mm. The crusher is preceded by a 150 mm aperture vibrating grizzly.

Grinding
The first grinding stage consists of a 8.5 x 4.35 m SAG mill (6000 kW) that is closed with a 10 mm slotted aperture screen. A Pebble Crusher was installed in 2014 crushing a recycle rate of approximately 12%. Screen undersize reports to the 6.1 x 9.05 m (6000 kW) ball mill, which operates in closed circuit with a bank of 380 mm cyclones. After screening for trash removal, cyclone overflow reports to the CIL circuit.

BOULY
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

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Summary:

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Production:

CommodityUnits202120202019201820172016
Gold koz  ......  Subscription required  ......  Subscription required  ......  Subscription required262320214
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined  ......  Subscription required56,914 kt54,943 kt50,448 kt47,296 kt
Ore tonnes mined  ......  Subscription required12,502 kt12,148 kt12,041 kt7,466 kt4,545 kt
Waste  ......  Subscription required44,413 kt42,794 kt38,407 kt39,830 kt
Stripping / waste ratio  ......  Subscription required3.6 3.5 3.2 5.3
Tonnes processed  ......  Subscription required12,191 kt12,602 kt11,980 kt7,476 kt4,097 kt
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Reserves at December 31, 2020:
Bissa mine: Open pit Ore Reserves are presented at a 0.42-0.97 g/t Au cut-off grade based on a long term Au price of USD1,400/oz within a final pit design.

Bouly mine: Open pit Ore Reserves are presented at cut-off grades of 0.27 g/t Au for oxide, 0.29 g/t Au for transitional and 0.51 g/t Au for fresh based on a long term Au price of USD1,400/oz.

CategoryTonnage CommodityGradeContained Metal
Proven 18.86 Mt Gold 0.61 g/t 369 koz
Probable 80.027 Mt Gold 0.67 g/t 1,730 koz
Proven & Probable 98.887 Mt Gold 0.66 g/t 2,101 koz
Measured 28.078 Mt Gold 0.74 g/t 671 koz
Indicated 222.721 Mt Gold 0.67 g/t 4,829 koz
Measured & Indicated 250.799 Mt Gold 0.68 g/t 5,500 koz
Inferred 130.522 Mt Gold 0.59 g/t 2,461 koz
Total Resource 381.321 Mt Gold 0.65 g/t 7,960 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 743 / oz†   609 / oz†   659 / oz†  
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required† 992 / oz†   744 / oz†   828 / oz†  
† Net of By-Product.

Financials:

Units202120202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 85.6   43.6   138.6  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 330.8   402.9  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 136.8   209.6   119.5  
Operating Cash Flow M USD 95.1  
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Heavy Mobile Equipment as of June 3, 2021:
HME TypeModelSizeQuantity
Truck (haul) ....................... Subscription required 90 t ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2022
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Staff:

EmployeesYear
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2017
Integrated Report 2016
Technical Report 2012
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