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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
  • Gravity separation
  • Smelting
  • Concentrate leach
  • 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:

The Bagassi zone is an area of artisanal prospecting located south of 55 Zone that yielded positive geochemical results. At Bagassi South the mineralization consists of pyrite hosted in quartz veining. The surface definition of the vein can be traced by the artisanal mining. The vein is discontinuous over a strike length of some 800 m and is believed to dip to the southwest. Gold mineralization at Bagassi South is associated with quartz, white mica and pyrite alteration.


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
  • Gravity separation
  • Smelting
  • Concentrate leach
  • 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. The comminution circuit of the process plant is comprised of a primary jaw crusher and secondary cone crusher – both in open circuit – followed by a SAG (Semi Autogenous Grinding) mill.

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:

CommodityParameter2019
Gold Recovery Rate, %  ......  Subscription required
Gold Head Grade, g/t 6
Subscription required - Subscription is required.

Production:

CommodityUnits2019
Gold oz  ......  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:

Metrics2019
Ore tonnes mined  ......  Subscription required
Subscription required - Subscription is required.

Reserves at March 25, 2019:

CategoryTonnage CommodityGradeContained Metal
Measured 37 kt Gold 13.5 g/t 16 koz
Indicated 445 kt Gold 15.3 g/t 219 koz
Measured & Indicated 482 kt Gold 15.2 g/t 236 koz


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

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 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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