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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
  • Intensive Cyanidation Reactor (ICR)
  • Smelting
  • Centrifugal concentrator
  • Calcining
  • 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)
The Yaramoko Mine Complex consists of two high- grade underground gold mines: the 55 Zone and Bagassi South.
Latest NewsRoxgold Reports Fourth Quarter and Full Year 2020 Results     March 3, 2021


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
  • Orogenic
  • Hydrothermal


Summary:

Primary gold deposits in Burkina Faso occur within the Paleoproterozoic Birimian belt. Mineralization was synchronous with regional metamorphism and deformation. Gold deposits found within the Birimian greenstone belts of the West African shield are typically late orogenic hydrothermal deposits that exhibit a strong relationship with regional arrays of major shear zones. The gold mineralization is typically associated with an organized network of quartz veins containing subordinate amounts of carbonate, tourmaline, sulphides, and native gold. In these deposits, the gold is typically free milling. Alternatively, gold mineralization can also be associated with disseminated sulphides in strongly deformed alteration zones. In the alteration zones, gold may be free milling, but also refractory.

Gold mineralization is related to regional arrays of alteration and deformation zones, commonly located at major lithological discontinuities. The local controls on the distribution of the gold mineralization are structural and lithological.

In Burkina Faso, the weathering profile is deep and typically results in extensive surface oxidation of bedrock to a depth reaching more than 100 metres locally. In such areas, gold deposits typically comprise a surface oxide zone, an intermediate transition zone, and a deeper fresh rock zone. Gold is typically free milling in the oxide zone.

The gold mineralization found at the 55 Zone and Bagassi South Zone deposits is associated with low sulphide quartz veins and is free milling. The weathering profile over the deposit is shallow and ranges from approximately 10 to 30 metres.

Property Geology
The north-northeast trending Boni shear zone divides the Yaramoko Gold Project between predominantly Houndé volcanic and volcaniclastic rocks to the west and the minor volcanic rocks of the Diébougou granitoid domain to the east.

The eastern assemblage contains several intrusive bodies, including a diorite body east of the village of Yaramoko, a large quartz bearing granitoid which stretches south from the town of Bagassi, and a smaller granitoid body to the east of Bagassi. The granitoid body east of Bagassi hosts the 55 Zone gold deposit. A diabase (dolerite) dike trends north-northeast across the southern portion of the property.

Outcrop and core observations document the main lithological units present on the Yaramoko Gold Project as mafic volcanic rocks, felsic dikes, and late dolerite dikes. The mafic volcanic rocks constitute the main country rock, and are locally strongly magnetic and in places affected by calc- silicate skarn alteration (garnet, calcite, epidote, and magnetite). The mafic rocks are crosscut by multiple generations of felsic dikes with aplitic, pegmatitic, or porphyritic textures. Late dolerite dikes crosscut mafic volcanic rocks, felsic dikes and gold mineralization (SRK, 2013b).

Mineralization
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.

Four mineralogically distinct hydrothermal veins were defined from samples from the 55 Zone: quartz rich veins, iron-dolomite rich veins with quartz and muscovite, iron-dolomite and quartz veins with albite, and albite rich veins with quartz and iron-dolomite (GeoMinEx, 2013). Native gold is present in each vein type, with accompanying sulphides of pyrite and trace tellurides. The most abundant sulphide mineral, pyrite, occurs in veins and altered wall rock. Textural and chemical complexity of pyrite document a protracted period of crystallization from a compositionally evolving hydrothermal fluid. Native gold occurs in numerous textural associations and at a wide range of 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
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 1
SAG mill 1

Summary:

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.


Processing

  • Gravity separation
  • Intensive Cyanidation Reactor (ICR)
  • Smelting
  • Centrifugal concentrator
  • Calcining
  • 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:

CommodityParameter20202019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 8.59.513.515.316
Subscription required - Subscription is required.

Production:

CommodityUnits202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required13312775
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required351,689 t319,855 t133,601 t
Plant annual capacity  ......  Subscription required  ......  Subscription required400 kt270 kt
Tonnes processed  ......  Subscription required  ......  Subscription required307,591 t266,599 t143,855 t
Daily processing capacity  ......  Subscription required  ......  Subscription required1,100 t
Daily processing rate  ......  Subscription required  ......  Subscription required730 t664 t
Subscription required - Subscription is required.

Reserves at June 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven 393 kt Gold 5.1 g/t 65 koz
Probable 2,750 kt Gold 7.3 g/t 645 koz
Proven & Probable 3,143 kt Gold 7 g/t 710 koz
Measured 351 kt Gold 7.2 g/t 81 koz
Indicated 2,303 kt Gold 10.5 g/t 776 koz
Measured & Indicated 2,654 kt Gold 10 g/t 857 koz
Inferred 556 kt Gold 6.8 g/t 121 koz

Commodity Production Costs:

CommodityUnits202120202019201820172016
Cash costs Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 426 / oz 438 / oz 375 / oz
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 485 / oz 491 / oz 431 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^  ......  Subscription required  ......  Subscription required 740 / oz 740 / oz 705 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units20202019201820172016
Total operating costs ($/t milled) USD 152149184208196

Financials:

Units20202019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required75.7  30.9  
Revenue M USD  ......  Subscription required  ......  Subscription required168.86  159.41   41.4  
Operating Income M USD  ......  Subscription required  ......  Subscription required69.1  44.6   8.84  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required66.9  30.4   -1.76  
After-tax Income M USD  ......  Subscription required  ......  Subscription required45  23.2   -1.07  
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
Truck (underground) 60 t 2

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 11, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Financial Review 2018
Management Discussion & Analysis 2018
Press Release 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 Reports Fourth Quarter and Full Year 2020 Results March 3, 2021
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 announces Increase in Full Year Production Guidance May 16, 2018

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