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South Africa
Black Rock Operation

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 Location:
66 km NW from Kuruman, South Africa

  Address:
PO Box 187 Santoy Northern Cape
South Africa
8491
Phone  ...  Subscription required
Fax(053) 751 5251
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
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  • Personnel
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Manganese
Mining Method
  • Bord-and-pillar
Production Start...
Mine Life30 years (as of Jan 1, 2022)
Nchwaning and Gloria mines are collectively Black Rock Mine.

The Nchwaning II main drive North system and Nchwaning III satellite tip 2 system were commissioned and handed over to operations in September 2022. The Gloria surface plant and underground silo system and conveyors were successfully commissioned and handed over to operations in October 2021 and May 2022 respectively.

Ramp up production at the Black Rock Mine to 4.6 million tonnes saleable product per annum by F2025.


Owners

Source: p. 84
CompanyInterestOwnership
African Rainbow Minerals Ltd. 50 % Indirect
Assore Ltd. 50 % Indirect
Assmang Proprietary Ltd. (operator) 100 % Direct
African Rainbow Minerals Ltd. (ARM) owns 50% of Assmang (Pty) Ltd and Assore (Pty) Ltd owns 50%.

Assmang is jointly managed by ARM and Assore. ARM provides the administration and technical services while Assore performs the sales and marketing function.

Contractors

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Deposit Type

  • Banded iron formation


Summary:

The manganese ores of the Kalahari Manganese Field are contained within sediments of the Hotazel Formation in the Postmasburg Group of the Griqualand West Sequence, a sub-division of the Proterozoic Transvaal Supergroup. The Griqualand West Sequence comprises a basal dolomite and banded ironstones dominating the Ghaap, Postmasburg and the Olifantshoek Groups. The Postmasburg Group consists of basal basaltic andesites of the Ongeluk lava and banded ironstone and manganese of the Hotazel Formation.

On Belgravia, Santoy and Nchwaning farms the Hotazel Formation and overlying Mapedi shales and Lucknow quartzite sequences have been duplicated by thrusting. The thrusted orebodies were mined from surface at the Kalahari Manganese Field discovery outcrop, the Black Rock Koppie and at two other down dip interconnected Belgravia 1 and Belgravia 2 shafts. Mining reached depths of approximately 200 metres. The manganese resources hosted in the thrusted orebodies are reported, collectively, under Black Rock (Koppie area) orebodies. The average thickness of the HotazelFormation is approximately 75 metres, with the banded iron formation (BIF) hosted manganese orebodies occurring as three stratabound and stratiform units of variable thickness. The lowermost orebody (Seam 1) is of a higher grade in comparison to the topmost orebody (Seam 2). Seam 3, which occurs in between Seams 1 and 2, is thin and uneconomic.

The manganese orebodies exhibit a complex mineralogy and mor ........


Mining Methods

  • Bord-and-pillar


Summary:

Trackless mechanised equipment is used in the Bord and Pillar mining method. Two manganese seams are mined. The lowermost (Seam 1) at Nchwaning 3 is up to 6 metres thick, of which up to 5 metres is mined. There is, therefore, minimum dilution. Mining of Nchwaning Seam 2 has also been done on an optimum cut of 4.0 metres. Gloria Seam 1 is approximately 14 metres thick, but only an optimum cut of 4.2 metres is mined. No mining has been undertaken to date on Gloria Seam 2.

Mining in the eastern extremity of Nchwaning occurs at a depth of 200 metres, while the deepest (current) excavations are 570 metres below surface. Ore from Nchwaning No 2 Mine is crushed underground before being hoisted to a surface stockpile via a vertical shaft. Similarly, ore from the Nchwaning No 3 Mine is crushed underground before being conveyed to a surface stockpile via a decline conveyor system.

Gloria Mine's Manganese is extracted at depths that vary between 180 to 250 metres. Ore is crushed underground before being conveyed to a surface stockpile via a decline shaft.


Crushing and Grinding


Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Manganese Mt  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required3.73.1
All production numbers are expressed as lump & fines. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required3.74 Mt4.12 Mt3.5 Mt
Subscription required - Subscription is required.

Reserves at June 30, 2022:
Mineral Resources:
Nchwaning Mine true thickness cut-off: 4.0 metres-5.1 metres (Seam 1), true thickness cut-off: 4.0 metres to 5.0 metres (Seam 2);
Black Rock (Koppie area Seam 1, Seam 2) Cut-off: 30% Mn;
Gloria Mine (Seam 1) true thickness cut-off: 4.5 metres, Gloria Mine (Seam 2) true thickness cut-off: 4.0 metres.

CategoryTonnage Commodity
Proven 148.57 Mt Manganese
Probable 133.39 Mt Manganese
Proven & Probable 281.96 Mt Manganese
Measured 316.42 Mt Manganese
Indicated 283.56 Mt Manganese
Measured & Indicated 599.98 Mt Manganese
Inferred 152.94 Mt Manganese

Commodity Production Costs:

CommodityUnits202220212020201920182017
Site cash costs (produced) Manganese ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 525 / t   453 / t  
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Financials:

Units202220212020201920182017
Capital expenditures M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,240   1,671  
Revenue M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 10,495   8,322  
Operating Income M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 4,478   3,351  
EBITDA M ZAR  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 5,015   3,759  
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Heavy Mobile Equipment as of April 19, 2022:
HME TypeModel
Scoop Tram ....................... Subscription required
Truck (underground) ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 25, 2022
....................... Subscription required ....................... Subscription required Subscription required Oct 28, 2022
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2022
Subscription required 2021
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017

Corporate Filings & Presentations:

DocumentYear
Annual Result 2022
Integrated Report 2022
Other 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Integrated Report 2018
Other 2018
Integrated Report 2017
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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