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Burkina Faso
Bagassi South Mine (Yaramoko Mine)

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 Location:
43 S from Safane, Burkina Faso

  Regional Office:
Rue Worg-Ntondo, Zone du Bois – Secteur 22
Ouagadougou
Burkina Faso
01 BP 4861
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Cemented backfill
Processing
  • Calcining
  • Intensive Cyanidation Reactor (ICR)
  • Gravity separation
  • Smelting
  • Centrifugal concentrator
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life4 years (as of Jan 1, 2017)
Commercial production achieved at Bagassi South in September 2019.
Latest NewsRoxgold Announces Under Budget Completion of Bagassi South Project     December 13, 2018


Owners & OPERATOR

Source: p. 5
CompanyInterestOwnership
African Underground Mining Services (operator)
Roxgold Inc. 90 % Indirect
Roxgold owns a 90% beneficial interest in Roxgold SANU S.A., which owns the Yaramoko exploitation permit. The government of Burkina Faso retains a 10% carried interest.

Deposit Type

  • Vein / narrow vein


Summary:

Gold is the main mineralization of economic interest found on the Yaramoko Gold Project. The main areas of gold mineralization are the 55 Zone, Bagassi South Zone, 109 Zone, and 117 Zone. The 55 Zone and Bagassi South Zone are the two main zones, both of which are hosted in the Diebougou granitoid domain.

Both the 55 Zone and Bagassi South Zone deposits occur along dextral shear zones and gold is primarily associated with quartz veining. The bulk of the gold mineralization occurs in dilational segments of the shear zone where quartz veins are thicker and exhibit greater continuity. Gold typically occurs as coarse free grains in quartz and is associated with pyrite). The gold bearing veins range in size from a few centimetres to over 5 metres in width, and contain only minor concentrations of disseminated pyrite (frequently less than one percent). Adjacent sheared vein wall rock locally contains a small percentage of pyrite.

At the Bagassi South Zone, the gold mineralization is associated with laminated quartz-carbonate veins developed in two shear zones: QV1 and QV'. The average thickness of the gold mineralization at QV1 varies from less than one metre to over 18 metres and extends from the surface to over 300 metres depth; gold mineralization remains open along strike and at depth. Gold mineralization at the Bagassi South Zone is associated with quartz and pyrite alteration in similar structural settings as at the 55 Zone.


Mining Methods

  • Longhole stoping
  • Cemented backfill


Summary:

Mining operations at Yaramoko are comprised of the 55 Zone underground mine, which was commissioned in 2016, and Bagassi South underground mine, which was commissioned in 2019. The underground operations utilize longhole stoping with cemented rock fill as its primary mining method. Mine development and stoping operations are conducted for Roxgold by African Underground Mining Services under a mining services agreement.


Crushing and Grinding


Processing

  • Calcining
  • Intensive Cyanidation Reactor (ICR)
  • Gravity separation
  • Smelting
  • Centrifugal concentrator
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The processing plant was expanded in 2018 increasing the design capacity from 270,000 tonnes per annum to 400,000 tonnes per annum. The expansion was designed by DRA (Pty.) Ltd in Johannesburg, South Africa.

The processing plant uses the conventional gravity/CIL gold recovery processes.

This is followed by a gravity circuit fed from the cyclone underflow stream, consisting of two centrifugal concentrators and an intensive leach reactor for treatment of the gravity concentrate, treating 70 percent of the cyclone underflow. The process also includes a carbon-in-leach (CIL) circuit consisting of one leach tank and five adsorption tanks, treating the cyclone overflow.

The metal recovery and refining circuit consists of an elution circuit, electrowinning cells, and smelting furnace.

Recoveries & Grades:

CommodityParameter20202019
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 8.56
Subscription required - Subscription is required.

Production:

CommodityUnits20202019
Gold oz  ......  Subscription required *  ......  Subscription required *
All production numbers are expressed as metal in doré. * Combined production for Yaramoko Mine and Bagassi South Mine
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Mineral Reserves are reported at a gold grade cut-off of 2.8g/t Au for Bagassi South Underground, based on a gold price of US$1,500/ounce.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 576 kt Gold 7.6 g/t 141 kt
Indicated 436 kt Gold 12.9 g/t 180 kt
Inferred 176 kt Gold 8.1 g/t 46 kt


Proposed Heavy Mobile Equipment as of December 20, 2017:
HME TypeModelSizeQuantityLeased or
Contractor
Drill (long hole) ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required 3 Leased
....................... Subscription required ....................... Subscription required 1 Leased
....................... Subscription required ....................... Subscription required ....................... Subscription required 3 Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Feasibility Study Report 2017
Press Release 2017
Feasibility Study Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Roxgold Announces Under Budget Completion of Bagassi South Project December 13, 2018
Ausdrill-Barminco JV wins $220m mining services contract August 13, 2018
Roxgold Provides Operations and Bagassi South Construction Update February 26, 2018
Roxgold Announces Permitting Approval to Develop the Bagassi South Project January 3, 2018
Roxgold Announces Feasibility Study Results for Bagassi South Project; After-Tax IRR of 53.2% November 7, 2017

Aerial view:

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