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South Africa
Great Noligwa Mine (Moab Khotsong Mine)

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 Location:
16 km SE from Klerksdorp, South Africa

  Regional Office:
Randfontein Office park Corner of Main Reef Road and Ward Avenue
P.O. Box 2
Randfontein
South Africa
1760
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Fax+27-11-692-3879
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
  • Uranium
Mining Method
  • Pillar mining
Processing
  • Flotation
  • Agitated tank (VAT) leaching
  • Acid tank leaching
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Great Noligwa was merged with Moab Khotsong in 2014.


Owners

Source: p. 71
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
On October 18, 2017, Harmony entered into a share and asset sale and purchase agreement with AngloGold Ashanti Limited and Coreland Property Investment Company Proprietary Limited (now known as Harmony Moab Khotsong Operations Proprietary Limited) to acquire the Moab Khotsong and Great Noligwa mines, together with certain long life projects and tailings dams for consideration of US$300 million in cash, which was paid in full without any post-closing adjustment. The Moab Acquisition was completed with effect from March 1, 2018.

Deposit Type

  • Sedimentary


Summary:

The VR is the principal economic horizon at Moab Khotsong and the C Reef is the secondary economic horizon and contributes less than 5% of the mining. Both reefs are narrow tabular deposits forming part of the Witwatersrand Supergroup and are stratigraphically located near the middle of the Central Rand Group. The Vaal Reef lies approximately 255m below the C Reef.

The geology at Moab Khotsong is structurally complex with large fault-loss areas between the three predominant mining areas (Top mine, Middle mine and Zaaiplaats). The geological setting is one of crustal extension, dominated by major south-dipping fault systems with north-dipping Zuiping faults sandwiched between them. The De Hoek and Buffels East faults structurally bound the reef blocks of the Middle mine to the north west and south-east respectively and the northern boundary is a north-dipping Zuiping fault. Extensive drilling is taking place on the extremities of Middle mine targeting potential preserved blocks. Close infill drill spacing is required to delineate the structural definition between the major structures to optimise the mine design and extraction of the orebody.

The VR consists of a thin basal conglomerate (the C-Facies) and a thicker sequence of upper conglomerates (the A-Facies). These two sedimentary facies are separated by the B-Facies, which is a layer of barren orthoquartzite. The A Facies is the principal economic horizon at Moab Khotsong, but remnants of the C-Facies are sporadically preserved below the A-Facies. High gold values in the VR are often located at the base of this unit and are associated with high uranium values as well as with the presence of carbon. Uranium is an important by-product.

The C Reef is mined on a limited scale, in the central part of Top mine where a high-grade, north-south orientated sedimentary channel, containing two economic horizons, has been exposed. To the east and the west of this channel, the C Reef is poorly developed with relatively small areas of economic interest. As with the VR, high uranium values are also often associated with high gold values and the presence of a 5mm to 2cm thick carbon seam at the base of the conglomerate. To the north of the mine, the C Reef sub-crops against the Gold Estates Conglomerate Formation and, in the extreme south of the mine, the C Reef has been eliminated by a deep Kimberley erosion channel and the Jersey fault.


Mining Methods

  • Pillar mining


Summary:

Moab Khotsong mines (Great Noligwa has been incorporated with Moab Khotsong) are situated near the town of Klerksdorp.

The Vaal Reef, the operation’s primary reef, and the Crystalkop Reef, a secondary reef, are mined from a twin-shaft system over eight main levels at an average depth of 2,400m. Given the geological complexity of the orebody at Great Noligwa, the pillar mining method is employed.


Crushing and Grinding


Processing

  • Flotation
  • Agitated tank (VAT) leaching
  • Acid tank leaching
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Moab Khotsong’s mineral processing is done through the Great Noligwa gold plant with design capacity exceeding the maximum planned production volume from the operation. The plant uses the reverse gold leach method which recovers gold and uranium through gold cyanide and acid uranium leaching.

The operation has a dedicated ore processing plant within close proximity to Moab Khotsong and tailings are pumped to existing tailings storage facilities. Most of the waste rock is separated from reef ore underground and accounted for separately. All waste and reef is delivered to the metallurgical plant. [MINERAL RESOURCES AND MINERAL RESERVES P.65]

Noligwa plant was commissioned in 1971 and treats approximately 200 000 tons per month of reef material from the Great Noligwa, Noligwa and Moab Khotsong mines. Following milling in two run-of- mine mills, the slurry is thickened before being pumped to the uranium section for uranium extraction.

The uranium plant r ........

Recoveries & Grades:

CommodityParameter20142013
Gold Head Grade, g/t 6.446.15

Production:

CommodityUnits20142013
Gold koz 7883
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics20142013
Tonnes processed 0.4 Mt0.4 Mt

Reserves at December 31, 2013:

CategoryTonnage CommodityGradeContained 
Commodity
Proven & Probable 1.83 Mt Gold 8.12 g/t 0.48 M oz
Proven & Probable 1.83 Mt Uranium (U3O8) 270 g/t 1.11 M lbs
Total Resource 2.94 Mt Gold 17.29 g/t 1.64 M oz
Total Resource 2.94 Mt Uranium (U3O8) 520 g/t 3.34 M lbs

Commodity Production Costs:

CommodityUnits20142013
Total cash costs Gold USD 1,074 / oz 1,100 / oz
All-in sustaining costs (sold) Gold USD 1,185 / oz 1,305 / oz

Financials:

Units20142013
Capital expenditures M USD 7   13  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 10, 2020
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Staff:

Total WorkforceYear
Subscription required 2014
Subscription required 2013

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Other 2014
Year-end Mineral Reserves 2013
Annual Report 2012
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Aerial view:

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