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South Africa
Nkomati Mine

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 Location:
238 km E from Pretoria, South Africa
  Address:
ARM House 29 Impala Road Chislehurston
Johannesburg
South Africa
2196
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News
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Overview

StatusCare and Maintenance
Mine TypeOpen Pit & Underground
Commodities
  • Nickel
  • Copper
  • Cobalt
  • PGM
  • 4E (Pt, Pd, Rh, Au)
Mining Method
  • Truck & Shovel / Loader
  • Mechanized Cut & Fill
Production Start...
Nkomati Mine was placed on care and maintenance in March 2021. African Rainbow Minerals and its joint-venture partner are evaluating various options on the way forward for Nkomati Mine.

Owners

Source: p. 41
CompanyInterestOwnership
African Rainbow Minerals Ltd. 50 % Indirect
Norilsk Nickel Africa (Pty) Ltd. 50 % Indirect
Ownership Tree
African Rainbow’s attributable beneficial interest in the Nkomati operation is 50%. The other 50% is held by Norilsk Nickel Africa (Pty) Ltd.

Contractors

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Deposit Type

  • Magmatic

Summary:

Sulphide and chromite mineralisation occurs within the Uitkomst Complex, a Bushveld-age, layered, mafic-ultramafic intrusion, which concordantly intrudes dolomite/chert of the Malmani Subgroup and shales/quartzites of the Timeball Hill Formation. The Uitkomst Complex, which lies unconformably on an Archaean basement, is a north-west/south-east tubular shaped body which outcrops in the Slaaihoek Valley for approximately 9 kilometres before dipping at 4º below an escarpment where it has been drilled down-dip for another 4 kilometres and is still open-ended to the north west.

From the base to top, the stratigraphy of the Uitkomst Complex comprises the Basal Gabbro Unit (up to 15 metres thick), the Lower Pyroxenite Unit (average 35 metres), the Chromititic Peridotite Unit (30 to 60 metres), the Massive Chromitite Unit (up to 10 metres), the Peridotite Unit (330 metres), the Upper Pyroxenite Unit (65 metres), the Gabbronorite Unit (250 metres), and the Upper Gabbro Unit (50 metres). The complex and surrounding sediments are intruded by numerous diabase sills up to 30 metres in thickness.

Apart from the now mined-out Massive Sulphide Body (MSB), situated at and below the base of the Uitkomst Complex, there are three main economic sulphide mineralised zones:
-The Basal Mineralised Zone (BMZ) within the Basal Gabbro;
-The Main Mineralised Zone (MMZ) occurring within the Lower Pyroxenite Unit;
-The Chromititic Peridotite Mineralised Zone (PCMZ) wh ........

Mining Methods

  • Truck & Shovel / Loader
  • Mechanized Cut & Fill

Summary:

Mining operations comprise open-pit mining operation which feeds two concentrators (Main Mineralised Zone and Chromititic Peridotite Mineralised Zone) producing concentrate containing PGMs, nickel, copper and cobalt. Previously, MMZ was also mined by underground mechanised mining methods but this operation is now on care and maintenance.

Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2021202020192018201720162015
Nickel t  ......  Subscription required  ......  Subscription required  ......  Subscription required13,30215,87521,59221,298
Copper t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Cobalt t  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
PGM oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.
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Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required7.09 Mt5.9 Mt5.2 Mt7.61 Mt
Tonnes milled  ......  Subscription required  ......  Subscription required8.15 Mt8.04 Mt7.49 Mt8.24 Mt
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Reserves at June 30, 2021:
The Mineral Resources as at 30th June 2022 at Nkomati are unchanged from June 30, 2021.

Key assumptions for Mineral Resources:
Grade cut-off Underground: 0.30% Ni MMZ (Main Mineralised Zone) and 0.30% Ni PCMZ (Chromititic Peridotite Mineralised Zone). Grade cut-off Open-pit: 0.16% Ni MMZ and 0.16% Ni PCMZ.

MMZ (Main Mineralised Zone) and PCMZ (Chromititic Peridotite Mineralised Zone) stockpile Mineral Resources: grade cut-off 0.16% Ni.

CategoryOreTypeTonnage CommodityGrade
Measured 72.89 Mt Nickel 0.32 %
Measured Stockpiles 0.34 Mt Nickel 0.22 %
Measured 72.89 Mt Copper 0.12 %
Measured Stockpiles 0.34 Mt Copper 0.08 %
Measured 72.89 Mt Cobalt 0.02 %
Measured Stockpiles 0.34 Mt Cobalt 0.01 %
Measured 72.89 Mt 4E (Pt, Pd, Rh, Au) 0.89 g/t
Measured Stockpiles 0.34 Mt 4E (Pt, Pd, Rh, Au) 0.63 g/t
Indicated 94.62 Mt Nickel 0.37 %
Indicated 94.62 Mt Copper 0.15 %
Indicated 94.62 Mt Cobalt 0.02 %
Indicated 94.62 Mt 4E (Pt, Pd, Rh, Au) 0.98 g/t
Measured & Indicated 167.51 Mt Nickel 0.35 %
Measured & Indicated 167.51 Mt Copper 0.14 %
Measured & Indicated 167.51 Mt Cobalt 0.02 %
Measured & Indicated 167.51 Mt 4E (Pt, Pd, Rh, Au) 0.94 g/t
Inferred 46.35 Mt Nickel 0.4 %
Inferred 46.35 Mt Copper 0.13 %
Inferred 46.35 Mt Cobalt 0.02 %
Inferred 46.35 Mt 4E (Pt, Pd, Rh, Au) 0.97 g/t

Commodity Production Costs:

CommodityUnits202120202019201820172016
C1 cash costs Nickel USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 5.86 / lb†   4.81 / lb†   4.18 / lb†  
† Net of By-Product.
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Operating Costs:

Units2021202020192018201720162015
Total operating costs ($/t milled) ZAR 384380394339367338347

Financials:

Units2022202120202019201820172016
Capital expenditures M ZAR  ......  Subscription required 428   718   488  
Revenue M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 3,278   3,991   4,491  
Operating Income M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required 494   660   -112  
After-tax Income M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 20   -1,240  
EBITDA M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 360   618  
Operating Cash Flow M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 542   566  
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Pipelines
TypeMaterialDiameterLengthDescription

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014
Subscription required Subscription required Subscription required 2013

Corporate Filings & Presentations:

DocumentYear
Integrated Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Other 2018
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Project Description 2013
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