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DRC
Ruashi Mine

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 Location:
0 km E from Lubumbashi, DRC

  Address:
Ruashi Mine Site, Luano
Lubumbashi
DRC
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Cobalt
Mining Method
  • Truck & Shovel / Loader
Processing
  • Sulfuric acid (reagent)
  • Counter current decantation (CCD)
  • Acid tank leaching
  • Solvent Extraction & Electrowinning
Mine Life10 years (as of Jan 1, 2019)


Owners & OPERATOR

Source: p. 15, 240, 253, 255
CompanyInterestOwnership
Gécamines S.A 25 % Indirect
Jinchuan Group International Resources Co. Ltd. 75 % Indirect
Ruashi Mining SAS (operator) 100 % Direct
Jinchuan Group International Resources (“Jinchuan International”) is a majority-owned subsidiary of Jinchuan Group and flagship platform for overseas resources development.

Via its subsidiary – Metorex, Jinchuan International owns 75% interest in Ruashi Mining SAS which owns the Ruashi Mine. The remaining 25% interest in Ruashi Mining SAS is held by Gécamines S.A.(La Générale des Carrières et des Mines)

Deposit Type

  • Sediment-hosted


Summary:

The Ruashi ore body is a stratiform, sediment-hosted copper deposit (“SSC”) located in the Central African Copper belt. The Copper belt forms one of the world’s greatest metallogenic provinces containing over a third of the world’s cobalt reserves and a tenth of the world’s copper reserves. The Central African Copper belt is second only to the Chilean Porphyry belt in terms of copper endowment but lags significantly in terms of production.

The Ruashi copper-cobalt ore bodies are situated within a 24 km long by 2 km wide, northwest to southeast trending fold structure. The Lukuni-Ruashi Etoile trend consists of a recumbent, synclinal fold, Ruashi on the southern limb and Etoille on the northern limb. The flanks are made up of Roan rocks and the core by the Mines Group, all occurring to the southwest of a prominent regional northwest to southeast trending thrust fault. A local thrust fault dipping to the south, locates within the RAT formation immediately south of the Ruashi ore bodies. A listric fault-breccia pattern separates the ore bodies from one another.

Three ore bodies have been identified at the Ruashi Mine, namely Ruashi I, Ruashi II and Ruashi III.

Ruashi I, the largest of the three, is located in the northwest of the mining area. The lateral extent of Ruashi I measures approximately 900 m in a northwest to southeast direction and 350 m across strike. In cross-section, the oxide zone extends to approximately 130 m below surface, whilst sulphide mineralisation has been intersected to depths of more than 300 m below surface. The Ruashi I ore body terminates against a brecciated shear zone on the north-western and south-eastern edges of the pit.

Ruashi II is a smaller fragment, extending along strike for approximately 200 m and 250 m across strike. It terminates against listric shear zones to the north-west and south-east. Currently, a flat lying thrust fault terminates the ore body in depth. Exploration is planned to confirm the lack of, or existence of a mineralised ore body below the thrust fault. A large gap of approximately 200 m of brecciated Lower Kundelungu strata separates Ruashi II from Ruashi I.

Ruashi III occurs at the south-easterly end and has a strike length of approximately 650 m and a cross strike width of 200 m. Unlike Ruashi I and II, the copper orebody is buried by 30 m to 80 m of cover rocks. A HG cobalt zone or “cap” with low grade copper starts at a depth of approximately 12 m below surface in the west. Ruashi III is structurally controlled within a complex fold structure. The oxide zone extends to a depth of 300 m in the east. Drilling during the latter part of 2010 exposed malachite mineralization some 200 m beyond the previous eastern limits of the ore-body, down to depths of 300 m. Artisanal mining on Ruashi III has not been as extensive as at Ruashi I and II, and was restricted to the upper near surface cobalt zone 10 to 20 m below surface.

Oxide copper minerals at Ruashi include malachite, chrysocolla, native copper, cuprite, cornetite and azurite. Other oxide minerals include magnetite and specularite. The dominant cobalt mineral in the oxide zone is heterogenite. Trace quantities of oxidised uranium minerals have been observed but are very uncommon.

Chalcopyrite and diginite dominate the copper minerals in the sulphide zone (up to 96%). Bornite is found in minor quantities. Cobalt sulphides in the form of linnaeite and carrollite are irregularly distributed in intimate mixtures with the copper sulphides, with sporadic abnormal concentrations. Extremely high quantities of cobalt may occur in veins dominated by cobalto-calcite. Disseminated pyrite is found in all the formations and occurs as small amorphous masses in the grey RAT (Roches Argileuses Talceuse).

Abundant pyrite mineralization occurs in the graphitic shales of the SDS zone. Chalcocite together with malachite occurs below the water table in the transition zone as replacement rims on primary bornite and chalcopyrite sulphides. Cobalt sulphides generally decrease with depth beyond the transition zone.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Ruashi Mine is an open cast mining operation and the deposit is mined by conventional open-pit mining methods using truck and excavator combinations. It has an annual production capacity of approximately 38.5 kt of copper and 5 kt of cobalt.

Ruashi I is largely mined out up to a depth of approximately 52 m below surface (1 240 amsl). The design extends another 28 m down to the 1 205 level. However, a southern pushback is planned to access additional ore at depth. The pit is accessed by a ramp from the north, with the north-western and south-eastern parts being serviced by ramps branching off from the existing northern ramp.

Ruashi II is the smallest of the three ore bodies. The design extends up a depth of 90 m below surface (1 195 amsl). The pit has a diameter of roughly 400 m on surface. A single ramp provides access to all the levels in both Pit II and Pit III. The current pit floor is 41 m below surface.

Ruashi II is the smallest of the three ore bodies. The design extends up a depth of 90 m below surface (1 195 amsl). The pit has a diameter of roughly 400 m on surface. A single ramp provides access to all the levels in both Pit II and Pit III. The current pit floor is 41 m below surface.

Ruashi III is the largest ore body with the highest overburden stripping requirement. The pit floor of phase I stripping is now at 25 m below surface and the BOMZ horizon containing HG cobalt ore is exposed in the northern portion of the pit. The pit has a designed depth of 190 m with the lowest bench on the 1 095 m elevation and is accessed by a dual ramp system. However, the poor geotechnical qualities of the weathered RAT unit on the southern pit walls preclude the presence of permanent ramps. The ramp configuration is largely a function of the separate mining stages on the southern and northern side of the pit.

The mining equipment is owned and maintained by MCK, the mining contractor. The majority of material can be loaded without drilling and blasting. Loading is carried out by diesel powered hydraulic excavators. Waste and ore is hauled by 40 t ADTs.


Crushing and Grinding


Processing

  • Sulfuric acid (reagent)
  • Counter current decantation (CCD)
  • Acid tank leaching
  • Solvent Extraction & Electrowinning

Flow Sheet: Subscription required

Summary:

Ruashi Mining commenced stockpile mining operations in June 2005 for processing through the Ruashi Phase I oxide flotation concentrator plant. Phase I involved the construction of a concentrator plant to treat the oxide stockpiles that were left untreated by Union Minière and Gécamines with the concentrate being transported to the SX-EW facility owned by Sable Zinc in Zambia where copper cathode and cobalt carbonate were produced. Phase II of the project commenced in March 2007 and involved the development of the Ruashi Mine opencast orebody and the construction of an expanded crushing and milling section, the new acid leaching section and SX-EW plant for the production of copper cathode and cobalt hydroxide on site from ore mined from the Ruashi Mine orebody. Open-pit mining operations at the Ruashi Mine commenced in October 2007. Stockpile reserves were depleted and the Phase I concentrator plant was placed on care and maintenance in March 2009. All copper and cobalt have been produc ........

Recoveries & Grades:

CommodityParameter201920182017
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 2.922.642.91
Subscription required - Subscription is required.

Production:

CommodityProductUnits201920182017201620152014
Copper Cathode t  ......  Subscription required  ......  Subscription required31,54632,12935,05637,170
Cobalt Hydroxide t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019
Tonnes processed  ......  Subscription required
Annual milling capacity  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 0.1 Mt Copper 6.1 % 6 kt
Proven 0.1 Mt Cobalt 0.4 %
Probable 12.1 Mt Copper 2.17 % 262 kt
Probable 12.1 Mt Cobalt 0.23 % 28 kt
Proven & Probable 12.2 Mt Copper 2.19 % 268 kt
Proven & Probable 12.2 Mt Cobalt 0.24 % 29 kt
Measured 0.1 Mt Copper 6.1 % 6 kt
Measured 0.1 Mt Cobalt 0.4 %
Indicated 27.6 Mt Copper 2.03 % 560 kt
Indicated 27.6 Mt Cobalt 0.25 % 70 kt
Inferred 6.8 Mt Copper 1.66 % 113 kt
Inferred 6.8 Mt Cobalt 0.31 % 21 kt
Total Resource 34.4 Mt Copper 1.97 % 678 kt
Total Resource 34.4 Mt Cobalt 0.27 % 92 kt

Financials:

Units2019201820172016201520142013
Capital expenditures M USD  ......  Subscription required 2.2   2.3   29.7  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 262.1   331.3   304.7  
Subscription required - Subscription is required


Heavy Mobile Equipment as of August 30, 2013:
HME TypeSizeQuantity
Dozer (crawler) 4
Excavator 8
Grader 4
Truck (dump) 40 t 28

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 28, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 28, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Annual Report 2015
Annual Report 2014
Annual Report 2013
Other 2013
Subscription required - Subscription is required.

Aerial view:

Subscription required - Subscription is required.

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