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Ghana
Tarkwa Mine

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 Location:
1 km W from Tarkwa, Ghana

  Regional Office:
No 7 Dr Amilcar Cabral Road Airport Residential
Accra
Ghana
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Fax+233-302-770-187
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life2035
The Tarkwa mine consists of several open pit operations. Mining is done by open pit using conventional drill and blast and truck and shovel methods. Gold Fields operates the mine with a conventional carbon-in-leach plant.


Owners

Source: p. 201
CompanyInterestOwnership
Government of Ghana 10 % Indirect
Gold Fields Ltd. 90 % Indirect
Gold Fields Ghana Ltd owns 100% interest in the Tarkwa operation in Ghana. Gold Fields Limited owns 90% interest in Gold Fields Ghana Limited and the remain 10% is held by the government of Ghana, as required under the mining law of Ghana.

Contractors

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Deposit Type

  • Paleoplacer
  • Hydrothermal


Summary:

The Tarkwa orebody consists of a series of planar meta-sedimentary palaeoplacer deposits (2,132-2,095 Ma old), similar to those mined in the Witwatersrand Basin of South Africa (2,900-2,700 Ma old) with haematite being the dominant heavy mineral at Tarkwa in place of pyrite seen within the Witwatersrand deposits.

The mineral association of the reefs is consistent throughout all the open pits. The predominant gangue minerals are quartzite (83-90 wt%), muscovite (6-12 wt%) and kaolinite (1-3 wt%). The presence of kaolinite is an indication of the degree of superficial weathering of the orebody. Iron oxide, predominantly haematite, is the most common nonsilicate gangue mineral found in most parts of the deposit, varying between 2-3 wt%, along with minor magnetite. There are also trace amounts of todorokite (a hydrous manganese oxide, < 1 wt%) and copper. Sulphur exists in very minor quantities, especially associated with quartz veining at Pepe North and the Pepe West Limb area, most of which is already mined out. The concentrations are too low to have any detrimental effect on gold cyanidation or the environment. The reefs are interbedded with barren quartzite zones. The major gold bearing horizons are:
• AFc – up to 3.0 m thick, only occurs in the west and subcrops against the A1 in the east. Well sorted with rounded clasts of quartzite and visible gold. The AFc sub-outcrops against the A1 package at Akontansi East and is therefore not developed in the Pepe-Teb ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

In open pit mining, access to the orebody is achieved by stripping the overburden in benches of fixed height to expose the ore below. This is most typically achieved by drilling and blasting an area, loading the broken rock with excavators into dump trucks and hauling the rock and/or soil to dumps. The overburden material is placed on designated waste rock dumps.

Mining operations are carried out by contractor miners using open-pit, conventional drill and blast with truck and shovel methods. Mining occurs from several pits, which haul to the processing facility. Blast restrictions are applied to the Teberebie Cut 4 pit only. Slope stability has been supported by effective wall monitoring and blasting practices.

Four large open pits currently exploit the stacked narrow auriferous conglomerates.

Extraction of the orebody involves a similar activity as in stripping the overburden. Lines are established on the pit floor demarcating ore from waste material and the rock is then drilled and blasted. Post blasting, the ore is loaded into dump trucks, based on a defined ‘dig plan’ demarcating the position of the ore and waste boundaries post the heave and throw movement caused by the blasting, and hauled to interim stockpiles or directly to the crusher at the process plant, while the waste is hauled to waste rock dumps.

Mining at Tarkwa is carried out using conventional selective open pit mining methods which have been highly successful over ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityUnits2023202220212020201920182017
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required525566
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Plant annual capacity  ......  Subscription required  ......  Subscription required14 Mt13.5 Mt13.5 Mt13.5 Mt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required6.5 5.2 5.3 5.2
Ore tonnes mined  ......  Subscription required  ......  Subscription required11,877 kt15,029 kt14,176 kt16,703 kt
Waste  ......  Subscription required  ......  Subscription required77,027 kt77,494 kt75,471 kt87,085 kt
Total tonnes mined  ......  Subscription required  ......  Subscription required88,904 kt92,523 kt89,647 kt103,788 kt
Tonnes processed  ......  Subscription required  ......  Subscription required14,234 kt13,749 kt13,791 kt13,527 kt
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Reserves at December 31, 2022:
Mineral Resources Cut-off for mill feed 0.34 g/t.

Mineral Reserves Cut-off for mill feed 0.40 g/t.

CategoryTonnage CommodityGradeContained Metal
Proven 43,327 kt Gold 1.16 g/t 1,612 koz
Probable 120,339 kt Gold 0.84 g/t 3,243 koz
Proven & Probable 163,666 kt Gold 0.92 g/t 4,856 koz
Measured 9,615 kt Gold 1.47 g/t 453 koz
Indicated 51,763 kt Gold 1.35 g/t 2,240 koz
Measured & Indicated 61,378 kt Gold 1.36 g/t 2,693 koz
Inferred 5,425 kt Gold 1.46 g/t 255 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 951 / oz†   940 / oz†  
All-in costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 951 / oz†   940 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 156   181  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 156   181  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 666.9   710.8  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 40.1   85.4  
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Water Supply
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Heavy Mobile Equipment as of December 31, 2022:
HME TypeModelQuantity
Drill ....................... Subscription required ....................... Subscription required
Drill ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 22, 2023
....................... Subscription required ....................... Subscription required Subscription required Aug 22, 2023
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022

Corporate Filings & Presentations:

DocumentYear
Financial Review 2022
Form 20-F 2022
Integrated Report 2022
Other 2022
Technical Report 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Other 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Financial Review 2016
Year-end Mineral Reserves 2016
Financial Review 2015
Year-end Mineral Reserves 2015
Technical Report 2012
Technical Report 2011
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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