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Burkina Faso
Bomboré Mine

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 Location:
69 km E from Ouagadougou, Burkina Faso

  Regional Office:
Rue 25.264 Porte 131, Zone industrielle Kossodo
Ouagadougou
Burkina Faso
01 B.P. 1639
Phone  ...  Subscription required
Fax+226-50-35-56-44
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life13.3 years (as of Jan 1, 2020)
On December 1, 2022, the Bomboré Gold Mine achieved commercial production.
Latest NewsOrezone Reports Fourth Quarter and Full Year 2022 Results     March 23, 2023


Owners

Source: p. 4
CompanyInterestOwnership
Government of Burkina Faso 10 % Indirect
Orezone Gold Corp. 90 % Indirect
Orezone Bomboré S.A. (operator) 100 % Direct
The Bomboré Mining Permit is registered in the name of Orezone Bomboré S.A. (OBSA), a 90% owned subsidiary of Orezone Inc. s.a.r.l., itself a 100% owned subsidiary of Orezone Inc., which is 100% owned by Orezone Gold Corp.

Contractors

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Deposit Type

  • Hydrothermal
  • Vein / narrow vein
  • Orogenic


Summary:

The Bomboré gold deposit is the principal gold mineralization of potential economic significance found to date on the Property. It is located in an area that is principally prospective for orogenic gold deposits. Similar to gold deposits found elsewhere in late Proterozoic Birimian terrains of West Africa, the Bomboré gold deposit exhibits a structural control and hydrothermal activity. It is a large tonnage, low grade system that has similar characteristics to other Birimian gold deposits such as Kiaka in Burkina Faso, Damang, Yamfo-Selwi and Obuasi in Ghana, and the Sadiola deposit in Mali.

Hydrothermal deposits are typically late orogenic deposits and exhibit strong relationship with regional arrays of major shear zones. The gold mineralization is typically associated with a network of quartz veins containing subordinate amounts of carbonate, tourmaline, sulphides, and native gold. In these deposits, the gold is typically free milling. Alternatively, the gold mineralization can also be associated with disseminated sulphides in strongly deformed alteration zones. In the latter case, gold may be free milling but also locked in the sulphide lattice structure and refractory. The Bomboré deposits are stratabound disseminated sulphide bodies preferentially hosted in the meta-gabbro and meta-argillite lithologies, which are interpreted to have acted as preferential gold traps during a syntectonic deformation and metasomatic event due to their chemical and rheological c ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Bomboré mine will be developed as an open pit operation mining oxide and sulphide material from over 60 separate pits of variable size and depth across a mineralized zone approximately 12.2 km long and 3 km wide. The oxides include the regolith, upper saprolite, lower saprolite, and upper transition weathering units. The oxide material can be readily excavated in situ (free-dig material). The sulphides include the lower transition and fresh rock weathering units, which will require a varying degree of drill and blast prior to being loaded onto trucks.

Mining within the Restricted Zones targets the free-dig oxide material and will only take place during the dry seasons. Mining, backfilling, and rehabilitation of the pits within these areas is to be fully completed prior to re-establishing river flow by the start of the next wet season.

Mining of ore and waste will be contracted out with an owner’s team responsible for site management, grade control, and mine planning activities. Mining of oxides will be undertaken with 4.5 m3 hydraulic excavators (i.e. Komatsu PC850) and 30-50 t highway dump trucks. The sulphides will be mined using a separate fleet (i.e. Komatsu PC1250 and 50 t Volvo FMX rigid body trucks) to account for the increased density, abrasion and hardness of the material.

ROM ore will be hauled to the process plant and low-grade material hauled to the low-grade stockpiles.

Separate waste rock dumps (WRD) will be constr ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnitsAvg. Annual (Projected)LOM (Projected)
Gold koz 1341,600
All production numbers are expressed as metal in doré.


Reserves at June 26, 2019:
Oxide resources are made up of the regolith, saprolite, and upper transition layers reported at a cut-off of 0.2 g/t Au.
Sulphide resources are made up of lower transition and fresh layers reported at 0.2 g/t Au and 0.38 g/t Au respectively.
Mineral Reserves are based on cut-off grades that range from 0.300 to 0.325 g/t Au for oxides, and 0.466 to 0.555 g/t Au for sulphides.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Sulphide 3,241 kt Gold 1.31 g/t 136 koz
Proven Oxide 20,213 kt Gold 0.73 g/t 473 koz
Proven Total 23,453 kt Gold 0.81 g/t 610 koz
Probable Sulphide 14,320 kt Gold 1.17 g/t 538 koz
Probable Oxide 32,326 kt Gold 0.66 g/t 687 koz
Probable Total 46,647 kt Gold 0.82 g/t 1,225 koz
Proven & Probable Sulphide 17,561 kt Gold 1.19 g/t 675 koz
Proven & Probable Oxide 52,539 kt Gold 0.69 g/t 1,161 koz
Proven & Probable Total 70,100 kt Gold 0.81 g/t 1,835 koz
Measured Sulphide 9,000 kt Gold 0.9 g/t 260 koz
Measured Oxide 31,600 kt Gold 0.62 g/t 628 koz
Measured Total 40,600 kt Gold 0.68 g/t 888 koz
Indicated Sulphide 113,600 kt Gold 0.79 g/t 2,894 koz
Indicated Oxide 75,300 kt Gold 0.53 g/t 1,273 koz
Indicated Total 188,900 kt Gold 0.69 g/t 4,167 koz
Measured & Indicated Sulphide 122,600 kt Gold 0.8 g/t 3,154 koz
Measured & Indicated Oxide 106,900 kt Gold 0.55 g/t 1,901 koz
Measured & Indicated Total 229,400 kt Gold 0.69 g/t 5,055 koz
Inferred Sulphide 32,400 kt Gold 0.81 g/t 842 koz
Inferred Oxide 20,900 kt Gold 0.4 g/t 265 koz
Inferred Total 53,300 kt Gold 0.65 g/t 1,107 koz



Proposed Heavy Mobile Equipment as of January 6, 2020:
HME TypeModelSizeQuantityLeased or
Contractor
Bulldozer ....................... Subscription required ....................... Subscription required Leased
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
....................... Subscription required ....................... Subscription required Subscription required Jan 6, 2020
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 5, 2023
....................... Subscription required ....................... Subscription required Subscription required Jan 5, 2023
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Annual Information Form 2022
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Annual Information Form 2018
Feasibility Study Report 2018
Press Release 2018
Press Release 2018
Technical Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Orezone Reports Fourth Quarter and Full Year 2022 Results March 23, 2023

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