South Africa

Masimong Mine

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Overview

Mine TypeUnderground
StatusActive
Commodities
  • Gold
Mining Method
  • Undercut mining
  • Conventional narrow-reef mining
Production Start... Lock
Mine Life... Lock
SnapshotMasimong is a deep-level mine in the Free State. The operation is close to the end of its mine life. 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. Ore mined is processed at the nearby Harmony One plant.

Owners

SourceSource
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.

The primary facies of Basal Reef intersected at Masimong 5 Mine is the Black Chert facies. It comprises two upward fining cycles. The lower one has a small to medium pebble conglomerate at its base, overlain by a grey ortho-quartzite. The upper unit consists of a pyrite-rich grit. The upper cycle tends to erode large segments of the Lower higher grade cycle in the south-west, with resultant lower values. Towards the east of the shaft, it appears that only the upper unit is present. Carbon is almost always present on the bottom contact of the lower cycle of the black chert facies.

The B3 facies of the B-Reef comprises polymictic medium to large pebble-supported conglomerates, with porphyry clasts, and yellow and green shale pebbles (fragments). The shale clasts are angular and tabular with the most common being yellow to mustard in colour. The non-durables account for 5-10% of the total clast composition. The durable pebbles are mainly black, smoky and vein quartz, sub rounded to rounded. Pebble sizes range from 0.7-4.5cm, and are poorly sorted. The matrix has a yellow-green argillaceous composition with noticeable yellow and black speckling. The B3 can occur on the shale or above the B2 quartzite. It can be a solid band or inter-bedded. The B3 facies is the primary facies being mined at Masimong and range from a pebbly quartzite to matrix or clast supported conglomerate with carbon present in the latter.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

Milling equipment has not been reported.

Processing

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Production

CommodityUnits2024202320222021202020192018201720162015
Gold oz  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe74,23784,33281,59978,19079,187
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational metrics

Metrics202320222021202020192018201720162015
Tonnes milled  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe602 kt647 kt640 kt650 kt670 kt

Production Costs

CommodityUnits2023202220212020201920182017
Cash costs Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,153 / oz   1,071 / oz   1,005 / oz  
All-in sustaining costs (sold) Gold USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 1,302 / oz   1,242 / oz   1,146 / oz  

Operating Costs

Currency20172016
Total operating costs ($/t milled) USD 116  100  

Financials

Units20242023202220212020201920182017
Capital expenditures (planned) M USD  ....  Subscribe
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 8   10   9  
Revenue M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 96   117   107  
Gross profit M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe  ....  Subscribe 11   27   25  

Heavy Mobile Equipment

Fleet data has not been reported.

Personnel

Mine Management

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ........... Subscription required ........... Subscription required Subscription required Nov 7, 2023
....................... Subscription required ....................... Subscription required Subscription required Nov 7, 2023

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2023
...... 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

Aerial view:

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