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South Africa
Masimong Mine

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 Location:
2 km E from Welkom, South Africa

  Address:
2VHF+3M, Free State
Welkom
South Africa
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  • Overview
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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Undercut mining
  • Conventional narrow-reef mining
Mine Life2 years (as of Jan 1, 2022)


Owners

Source: p. 51
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. (operator) 100 % Indirect
Harmony has Masimong underground mining operation.

Contractors

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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. Approximately 80% of the centares (1 centare = 1 square metre) are from the Basal Reef horizon and 20% from the Basal B Reef horizon.


Mining Methods

  • Undercut mining
  • Conventional narrow-reef mining


Summary:

Masimong is a deep-level mine. The operation is close to the end of its mine life, with two years of mining left.

The Masimong complex comprises two shafts with 5 Shaft used as the operating shaft and 4 Shaft for ventilation, pumping and a second escape outlet. Masimong exploits the Basal Reef and B Reef, using a conventional tabular narrow-reef stoping method.

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 two years, mainly due to the successful opening of known value trend extensions.


Crushing and Grinding


Processing

Source: Subscription required

Summary:

- subscription is required.

^ Guidance / Forecast.

Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required84,33281,59978,190
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required602 kt647 kt640 kt
Subscription required - Subscription is required.

Reserves at June 30, 2022:
Masimong 2022 cut-off 1,014 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 0.7 Mt Gold 4.95 g/t 117 koz
Probable 0.3 Mt Gold 3.47 g/t 30 koz
Proven & Probable 1 Mt Gold 4.55 g/t 147 koz
Measured 2.6 Mt Gold 9.25 g/t 785 koz
Indicated 0.2 Mt Gold 7.12 g/t 53 koz
Inferred 0.02 Mt Gold 6.91 g/t 5 koz
Total Resource 2.9 Mt Gold 9.06 g/t 843 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,071 / oz   1,005 / oz   916 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,242 / oz   1,146 / oz   1,059 / oz  
Subscription required - Subscription is required.

Operating Costs:

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

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M ZAR  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 10  USD 9  USD
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 117  USD 107  USD
Gross profit M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 27  USD 25  USD
Subscription required - Subscription is required



Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
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
Corporate Presentation 2022
Form 20-F 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
................................... 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
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