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Burkina Faso
Yaramoko Mine (Bagassi South Mine)

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 Location:
42 S from Safane, Burkina Faso

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

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Cemented backfill
Processing
  • Gravity separation
  • Smelting
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life7 years (as of Jan 1, 2020)
Latest NewsRoxgold Produces 133,940 Ounces Exceeding 2020 Production Guidance and Provides Outlook For 2021     January 12, 2021


Owners & OPERATOR

Source: p. 5
CompanyInterestOwnership
African Underground Mining Services (operator)
Government of Burkina Faso 10 % Indirect
Roxgold Inc. 90 % Indirect
Roxgold SANU S.A. 100 % Direct
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
  • Orogenic


Summary:

Yaramoko is underlain by geology considered to be similar to that of other Birimian-age volcano- sedimentary sequences. Hence, this region is considered prospective for orogenic gold deposits, which typically exhibit a strong relationship with regional arrays of major shear zones.

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

The 55 Zone occurs in a reverse dextral shear zone and gold is primarily associated with quartz veining. The bulk of the gold mineralization occurs in dilatational segments of the shear zone where quartz veins are thicker and exhibit greater continuity. Gold typically occurs as coarse free grain in quartz and is associated with pyrite. The gold-bearing veins range from a few centimetres to more than 4 m in width, and have only minor contents of disseminated pyrite (frequently less than 1%). Adjacent sheared vein wall rock locally contains a small percentage of pyrite.

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.

Four mineralogically distinct hydrothermal veins were defined: 1) quartz-rich veins, 2) iron- dolomite rich veins with quartz and muscovite, 3) iron-dolomite and quartz veins with albite, and 4) albite-rich veins with quartz and iron-dolomite (GeoMinEx, 2013). Native gold is present in each vein type, with accompanying sulphides mainly as pyrite and traces of tellurides. The most abundant sulphide mineral, pyrite, occurs in veins, altered wall rock. Textural and chemical complexity of pyrite document protracted period of crystallization from a compositionally evolving hydrothermal fluid. Native gold occurs in numerous textural associations and at a wide range in grain size ranging from less than 1 and up to 300 micrometres.

The second type of gold mineralization encountered is also associated with pyrite, occurring in zones of conspicuous shearing primarily in the volcanic rocks, with minimal to no significant quartz veining. These two styles of mineralization represent two end-members of brittle-ductile deformation within the 55 Zone where coarse gold in veining, usually seen in a granitic host, defines a more brittle environment while pyrite and shearing in the volcanic rocks is typical of a ductile domain.


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

  • Gravity separation
  • Smelting
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • 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:

CommodityParameter2019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 9.513.515.316
Subscription required - Subscription is required.

Production:

CommodityUnits20202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required126,99075,078
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required133,601 t
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required143,855 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Daily processing rate  ......  Subscription required  ......  Subscription required  ......  Subscription required664 t
Subscription required - Subscription is required.

Reserves at March 25, 2019:

CategoryTonnage CommodityGradeContained Metal
Measured 542 kt Gold 11.9 g/t 208 koz
Indicated 1,580 kt Gold 12.2 g/t 619 koz
Measured & Indicated 2,122 kt Gold 12.13 g/t 827 koz
Inferred 477 kt Gold 12.4 g/t 191 koz

Commodity Production Costs:

CommodityUnits20202019201820172016
Cash costs Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 438 / oz 375 / oz
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 491 / oz 431 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 740 / oz 705 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units2019201820172016
Total operating costs ($/t milled) 149184208196

Financials:

Units2019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 20, 2017:
HME TypeSizeQuantity
Drill 1
Drill (long hole) 1
Drill jumbo (single boom) 2
Drill jumbo (two boom) 1
Grader 1
Load-Haul-Dump (LHD) 4.6 cu. m 2
Load-Haul-Dump (LHD) 3 cu. m 5
Trans Mixer 1
Underground truck 60 t 2

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2020
....................... 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 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Feasibility Study Report 2017
Financial Review 2017
Management Discussion & Analysis 2017
Management Discussion & Analysis 2016
Feasibility Study Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Roxgold Produces 133,940 Ounces Exceeding 2020 Production Guidance and Provides Outlook For 2021 January 12, 2021
Roxgold Reports Updated Mineral Reserve and Resource Estimate at Yaramoko Mine Complex November 10, 2020
Roxgold Reports 77.2 GPT Over 6.0 Metres in Near-Surface Drilling at 55 Zone, Yaramoko Mine Complex September 30, 2020
Roxgold Announces Updated Mineral Reserves & Mineral Resources Statement Including Maiden NI 43-101 Mineral Resources Statement for the Séguéla Gold Project July 11, 2019
Roxgold Reports Solid 2019 First Quarter Production Results and Provides Exploration Update at Yaramoko April 29, 2019
Roxgold Exceeds 2018 Production Guidance and Provides 2019 Operational Outlook January 21, 2019
Roxgold announces Increase in Full Year Production Guidance May 16, 2018

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