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South Africa
Masimong Mine

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 Location:
2 km E from Welkom, South Africa

  Regional Office:
Randfontein Office park Corner of Main Reef Road and Ward Avenue
P.O. Box 2
Randfontein
South Africa
1760
Phone  ...  Subscription required
Fax+27-11-692-3879
EmailEmail
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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
  • Undercut mining
  • Open stoping
Processing
  • Calcining
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • AARL elution
  • Merrill–Crowe
  • Cyanide (reagent)
Mine Life1.5 years (as of Jan 1, 2020)


Owners

Source: p. 100
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. 100 % Indirect
Harmony purchased Saaiplaas 3 from Anglo American in March 1997 and the two Erfdeel shafts in September 1998, which were renamed Saaiplaas 4 and 5. In September 1998 entire complex was renamed Masimong.

Deposit Type

  • Conglomerate hosted


Summary:

Mining takes place in a structurally complex zone between two major north-south trending faults: the De Bron/Homestead Fault in the west and the Saaiplaas Fault in the east. The orebody has been subjected to severe deformation and contains numerous folds (anticlines and synclines) as well as an abundance of smaller faults.

The dip of the reef bands is very variable – from 45 degrees to the east, adjacent to the western side of the lease, to less than two degrees in parts of the southern area.

Production is hosted within two quartz pebble conglomerate bodies, developed above unconformity surfaces, the Basal and the B reefs.


Mining Methods

  • Undercut mining
  • Open stoping


Summary:

The Masimong complex comprises two shafts with the 5 shaft being used as the operating shaft and 4 shaft used for ventilation, pumping and as a second escape outlet. Masimong exploits the Basal Reef and the B-Reef by means of conventional tabular narrow reef stoping method. Mining is conducted at a depth of between 1 650m and 2 010m below collar.

Masimong mines at moderate depths of between 1 650m and 2 010m below surface. The reef horizon is accessed by means of conventional grid development. The Basal Reef, which accounts for approximately 80% of the on-reef production profile, is mined as by the open and undercut method, depending on whether the reef is overlain by shale. The B Reef, making up the remaining 20% of the on-reef production profile, is located approximately 120m stratigraphically above the Basal Reef, which necessitates separate infrastructure (footwall development).

The presence of the upper shale marker, approximately 20m thick below the B Reef, strains the development rates of the B Reef, requiring drop raising for holing on all boxholes. In addition, all on-reef development must be conducted by means of wide raising. Despite the marginality of the orebody and the current economic environment, current mine reserves give a life expectancy of three years, mainly due to the successful opening of known value trend extensions.


Crushing and Grinding


Processing

  • Calcining
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • AARL elution
  • Merrill–Crowe
  • Cyanide (reagent)

Source: Subscription required

Summary:

The ore mined is transported by rail for processing at the Harmony One carbon-in-pulp plant, situated some 12km from the shaft.

The ore is taken up the slow-moving conveyers from underneath the silos and discharged directly into the feed hopper for the six fully autogenous mills. For control purposes the mill feed belts and the mill discharge pumps both have variable speed drives. Each mill is a closed circuit with a 1200mm primary cyclone with mass flow measurement on the feed. The primary cyclone overflow is screened on a 600µm linear screen for the removal of coarse woodchips and tramp steel.

Calcium Oxide (lime) is added to the 6 thickeners (operating in 3 parallel modules) as slaked lime with levels of CaO being controlled at between 0.014 and 0.016% CaO. The lime maintains a protective level of alkalinity in the leach section to prevent the generation of poisonous HCN (cyanide) gas in the process. Thickening is carried out in six 60m diameter, cable torque ........

Recoveries & Grades:

CommodityParameter2020201920182017201620152014
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required4.053.973.743.684.06

Production:

CommodityUnits2021202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required84,33281,59978,19079,187
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Tonnes milled  ......  Subscription required602 kt647 kt640 kt650 kt670 kt
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Masimong 2020 cut-off 1,021 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 0.8 Mt Gold 4.26 g/t 108 koz
Probable 0.02 Mt Gold 2.95 g/t 2 koz
Proven & Probable 0.8 Mt Gold 4.23 g/t 110 koz
Measured 2.6 Mt Gold 8.65 g/t 733 koz
Indicated 0.2 Mt Gold 7.02 g/t 45 koz
Inferred 0.02 Mt Gold 6.62 g/t 5 koz
Total Resource 2.9 Mt Gold 8.51 g/t 783 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 1,071 / oz 1,005 / oz 916 / oz 1,080 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 1,242 / oz 1,146 / oz 1,059 / oz 1,302 / oz
Subscription required - Subscription is required.

Operating Costs:

Units20172016
Total operating costs ($/t milled) USD 116100

Financials:

Units2021202020192018201720162015
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required10   9   8   15  
Revenue M USD  ......  Subscription required  ......  Subscription required117   107   91   98  
Gross profit M USD  ......  Subscription required  ......  Subscription required27   25   19   11  
Subscription required - Subscription is required


Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Oct 27, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Form 20-F 2017
Integrated Report 2017
Other 2017
Other 2017
Other 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Form 20-F 2016
Integrated Report 2016
Year-end Mineral Reserves 2016
Other 2015
Other 2014
Subscription required - Subscription is required.

Aerial view:

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