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Ghana
Akyem Mine

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 Location:
76 km SE from Kumasi, Ghana

  Address:
PO Box 251
Nkawkaw
Ghana
Phone+233-50-132-3692
Fax+233-30-701-1855
WebsiteWeb
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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
  • Smelting
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life19 years (as of Jan 1, 2013)


Owners

Source: p. 42
CompanyInterestOwnership
Newmont Corp. 100 % Indirect
The Project is held through Newmont Ghana Gold Ltd., an indirectly-wholly owned subsidiary.

Deposit Type

  • Vein / narrow vein
  • Orogenic

Source: Source p.47

Summary:

The Akyem mine is an orogenic gold deposit that has oxide and primary mineralization. The gold is found in shear zones within greenschist-facies metasediments that have kilometer-scale vertical and lateral extent. Gold occurs primarily in pyrite and secondarily as native gold in quartz veins.


Mining Methods

  • Truck & Shovel / Loader

Source: p.48

Summary:

The mining method at the Akyem mine involves removal of ore and waste rock from an open pit mine. The open pit is an elongated structure consisting of a large western lobe (Main Pit) and a small eastern lobe (East Pit), connected near the surface. The planned pit covers an area of approximately 345 acres (139 hectares).

Mining is conducted using large scale conventional hard rock drill and blast open pit methodology. Run of Mine (ROM) ore is trucked from the pits using CAT 785 DT’s.


Crushing and Grinding
Source: Source p.2
Crusher / Mill TypeModelSizePowerQuantity
SAG mill 1
Ball mill 1


Processing

  • Smelting
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Source p.48

Summary:

The ore sources that are being treated in the Akyem mill includes an Oxide ore (consisting of Oxide Mafic and Oxide Greywacke ores), followed by a deeper Primary ore body (consisting of primary Mafic and primary Greywacke ores).

The Akyem gold processing plant was commissioned in 2013 to treat an average of 8.5 million tonnes of ore annually. With the depletion of oxide ore.

The process plant consists of a large conventional SAG and Ball Mill in closed circuit configuration with an annual production rate of >8mt. The rest of the Process Plant consists of a carbon-in-leach circuit with cyanidation followed by elution and refining for gold doré recovery.

Tailings remaining after completion of the processing and precious metals recovery are conveyed by pipeline to a counter-current decantation (CCD) plant where the tailings are rinsed with decant return water to reduce WAD cyanide concentrations to less than 50ppm WAD cyanide prior to final disposal. After the CCD circuit, the tailings are transferred via a lined tailings trench, to an engineered, lined tailings storage facility (TSF) for permanent disposal.

Sparging is a closed circuit mixing process that passes pH-adjusted water from a mixing tank through the isotainer in a continuous circuit until the required concentration of liquid cyanide is achieved. On completion of the sparging process, the liquid cyanide is transferred from the mixing tank to a dedicated storage tank, ready for delivery by pipeline to the process plant. All pipelines used for the transfer of cyanide to the process plant or within the process plant are either double-piped or installed above containment facilities to prevent the escape of leaks or spills to the surrounding surface.

The cyanide mixing facility at Akyem is specifically designed to handle the bulk sparging operations.

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Recovery Rate, % 90.690.891.292.391.790.8
Gold Head Grade, oz/ton 0.050.050.050.060.060.06

Production:

CommodityUnits2020201920182017201620152014
Gold koz 371422414473470473472
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics202020192018201720162015
Total tonnes mined 31,041 k tons35,687 k tons35,675 k tons35,227 k tons36,538 k tons35,832 k tons
Ore tonnes mined 7,793 k tons12,845 k tons11,709 k tons9,058 k tons9,899 k tons10,325 k tons
Waste 23,248 k tons22,842 k tons23,966 k tons26,169 k tons26,639 k tons25,507 k tons
Tonnes processed 9,007 k tons8,660 k tons8,566 k tons9,273 k tons9,276 k tons7,991 k tons
Daily mining rate 88 kt91 kt91 kt90 kt
Annual processing capacity 7.7 Mt8.5 Mt8.5 Mt8.5 Mt

Reserves at December 31, 2020:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Stockpiles 15,100 kt Gold 0.82 g/t 400 koz
Proven & Probable In-Situ (OP) 34,200 kt Gold 1.7 g/t 1,870 koz
Proven & Probable Total 49,300 kt Gold 1.43 g/t 2,270 koz
Measured & Indicated In-Situ (OP) 2,300 kt Gold 0.54 g/t 50 koz
Measured & Indicated In-Situ (UG) 5,300 kt Gold 3.85 g/t 650 koz
Measured & Indicated Total 7,600 kt Gold 2.86 g/t 700 koz
Inferred In-Situ (OP) 2,600 kt Gold 1.2 g/t 100 koz
Inferred In-Situ (UG) 3,700 kt Gold 3.31 g/t 390 koz
Inferred Total 6,300 kt Gold 2.42 g/t 490 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Total cash costs (sold) Gold USD 621 / oz† 558 / oz† 546 / oz† 573 / oz† 497 / oz† 435 / oz†
All-in sustaining costs (sold) Gold USD 757 / oz† 718 / oz† 705 / oz† 664 / oz† 584 / oz† 572 / oz†
† Net of By-Product.

Financials:

Units2020201920182017201620152014
Sustaining costs M USD 26  28  40  26   24   44   17  
Capital expenditures M USD 27  33  40  26   22   45   26  
Revenue M USD 671  585  
Pre-tax Income M USD 291  176  125  152   214   227   323  


Heavy Mobile Equipment as of December 31, 2018:
Source: Source p.48
HME TypeSizeQuantity
Excavator 2
Shovel 2
Truck (haul) 136 t 19

Mine Management:

Job TitleNameProfileRef. Date
General Manager Joshua Mortoti LinkedIn Feb 26, 2021
Health & Safety Manager Yaw Kyei Amoako LinkedIn Feb 26, 2021
Mine Maintenance Superintendent Raul Chauca LinkedIn Feb 26, 2021

Staff:

Total WorkforceYear
1,400 2018
1,400 2017
1,400 2016
1,450 2015

Corporate Filings & Presentations:

DocumentYear
Form 10-K 2020
Other 2020
Year-end Mineral Reserves 2020
Form 10-K 2019
Year-end Mineral Reserves 2019
Form 10-K 2018
Other 2018
Year-end Mineral Reserves 2018
Form 10-K 2017
Year-end Mineral Reserves 2017
Form 10-K 2016
Other 2016
Press Release 2016
Year-end Mineral Reserves 2016
Form 10-K 2015
Other 2015
Other 2014
Form 10-K 2013

Aerial view:

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