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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
Processing
  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life14 years (as of Jan 1, 2019)


Owners

Source: p. 95, 218
CompanyInterestOwnership
Gold Fields Ltd. 90 % Indirect
Gold Fields Ghana Ltd (“GFG”) 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.

Deposit Type

  • Hydrothermal
  • Paleoplacer


Summary:

The ore bodies are located within the Tarkwaian System, which is an important stratigraphic component of the Ashanti Belt in south-western Ghana. The Ashanti Belt is a north-easterly striking, broadly synclinal structure made up of lower proterozoic sediments and volcanics underlain by the metavolcanics and metasediments of the Birimian System. The Tarkwaian unconformably overlies the Birimian, and is characterised by lowerintensity metamorphism and the predominance of coarse grained, immature sedimentary units

Mineralisation hosted by conglomerates
- Laterally continuous with mid- to longrange predictability
- Clear patterns of mineralisation governed by sedimentary characteristics
- Exploration programmes ongoing to test homogeneity of geology and grade domains
- Targets are both palaeoplacer and hydrothermal.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mine utilises selective surface mining methods to optimise the extraction of the mineralised conglomerate units. Short-term mine planning and forecasts are based on grade controlled models. During mining, fresh rock and transitional zones are drilled and blasted in six-metre lifts, with excavation in three metre flitches.

The mine is owner-operated and has its own load and haul fleet of 13 excavators, which range from 120 to 400 tonnes. The haul fleet includes 67 dump trucks with a payload of 146 tonnes, eight dump trucks with a payload of 240 tonnes and nine dump trucks with a payload of 90 tonnes. The load and haul fleet are supported by an ancillary fleet consisting of dozers, graders, water carts and compactors. A total of 22 owneroperated drill rigs are used for blast hole drilling. Maintenance of the fleet is carried out by Tarkwa mine, while maintenance of the excavators is carried out by contractors.

Mining operations are carried out using contractor mining. Mining occurs from several pits which haul to the processing facility. Blast restrictions are applied to the Pepe 8, Atuabo and Mantraim pits, which will be complete in 2020. Pit wall steepening has been supported by effective wall monitoring and blasting practices. [2019 Mineral Resources and Mineral Reserves Supplement to the Integrated Annual Report. P.96]


Crushing and Grinding


Processing

  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

Ore is processed utilising a conventional CIL plant, with a gyratory crusher feeding a SAG mill and ball mill. Gold is recovered from solution by electro-winning and smelted in an induction furnace. Current plant capacity is 13.5Mtpa.

LoM tailings deposition requirements are catered for in the short term by wall raise sequences at the operating TSF 1, 2 and 5 facilities. The TSF 5 starting facility, whose downstream construction commenced in 2016, was completed in 2018. In the longer term, LoM tailings deposition requirements will be catered for by planned extended expansions to TSF 1, 2 and 5 and establishment of a new TSF 5 Annex that is planned to be constructed adjacent to TSF 5. [2019 Mineral Resources and Mineral Reserves Supplement to the Integrated Annual Report. P.96]

The initial development, Tarkwa Phase 1, was completed in April 1998 processing 4.7 million tonnes per annum (Mtpa) heap leach feed ore. An expansion, Phase 2, was completed in July 1999 inc ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.21.221.371.361.381.26
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required566568586
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required101,154 kt101,421 kt87,343 kt
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required14,551 kt14,754 kt13,625 kt
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required86,603 kt86,667 kt73,719 kt
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required6.4 5.9 5.4
Plant annual capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required13.5 Mt13.5 Mt13.5 Mt
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required13,608 kt13,520 kt13,553 kt
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Total 53,215 kt Gold 1.13 g/t 1,928 koz
Probable Total 143,468 kt Gold 0.86 g/t 3,967 koz
Proven & Probable Total 196,683 kt Gold 0.93 g/t 5,894 koz
Measured Total 70,003 kt Gold 1.32 g/t 2,960 koz
Indicated Total 217,569 kt Gold 1.02 g/t 7,161 koz
Inferred Total 20,331 kt Gold 1.21 g/t 791 koz
Total Resource Total 307,903 kt Gold 1.1 g/t 10,913 koz

Commodity Production Costs:

CommodityUnits2020201920182017201620152014
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required† 940 / oz† 959 / oz† 970 / oz† 1,068 / oz†
All-in costs Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required† 940 / oz† 959 / oz† 970 / oz† 1,068 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2020201920182017201620152014
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 204   174  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 204.2   174.1  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 680.7   706.7  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 87.5   83.7  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2015:
HME TypeSizeQuantity
Drill 22
Excavator 16
Truck (dump) 240 t 8
Truck (dump) 90 t 9
Truck (dump) 146 t 67

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 10, 2020
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Feb 18, 2019
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 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
Annual Report 2014
Technical Report 2012
Technical Report 2011
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Aerial view:

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