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Ghana
Damang Mine

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 Location:
65 km N from Takoradi, Ghana

  Regional Office:
No 7 Dr Amilcar Cabral Road Airport Residential
Accra
Ghana
Phone+233-302-770-189
Fax+233-302-770-187
EmailEmail
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
  • Gravity separation
  • Centrifugal concentrator
  • Smelting
  • Carbon re-activation kiln
  • Filter press plant
  • Agitated tank (VAT) leaching
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2025


Owners

Source: p. 97,221
CompanyInterestOwnership
Government of Ghana 10 % Indirect
Gold Fields Ltd. 90 % Indirect
Ownership Tree
Gold Fields Limited owns 90% of the issued shares of Abosso Goldfields Ltd. (AGL), with the Ghanaian government owning the remaining 10% free carried interest.

Deposit Type

  • Hydrothermal
  • Vein / narrow vein
  • Paleoplacer

Source: Source

Summary:

The Damang ore body is hosted by a north to north-easterly plunging antiform, developed within Tarkwaian sediments. The main Damang pit is located close to the closure of the antiform, and all other known mineralisation is located on the east and west limbs of the Damang anticline. The mine exploits fresh hydrothermal and oxide mineralisation in addition to Witwatersrand-style, palaeoplacer mineralisation.

Palaeoplacer mineralisation.
There are three gold-bearing conglomerate horizons recognised on the western limb of the Damang anticline. From footwall to hangingwall, these are known as the Star/Composite, Malta/Breccia and Gulder Reefs. There are also three gold-bearing conglomerate horizons recognised on the eastern limb, namely the Lima, Kwesie-K1 and Kwesie-K2 Reefs. These conglomerate horizons are separated by poorly-mineralised sandstone units.

The reefs are usually characterised by a fining upwards sequence of poorly to moderately sorted, clast-supported polymictic conglomerates. However, local variations are observed where the conglomerate domain is interbedded with fine to coarse grained, poorly sorted sandstones. The Star/Composite, Malta/Breccia and Gulder Reefs on the west limb and the Lima, Kwesie-K1 and Kwesie-K2 Reefs on the east limb of the Damang anticline contain higher gold grades than the poorly mineralised sandstone units, which separate the reefs. The conglomerate reefs may contain between 1.3 and 1.5 g/t gold, and the poorly mineralised sandstone units usually contain between 0.1 and 0.2 g/t gold.

Hydrothermal mineralisation.
Hydrothermal gold mineralisation at Damang occurs in pyrite and pyrrhotite alteration selvages, which are usually less than one metre wide and located immediately adjacent to en-echelon quartz veins. Gold is also associated with accessory vein minerals such as carbonate, muscovite, tourmaline, ilmenite and apatite. These alteration zones are often linked and may result in significant volumes, characterised by intense veining and gold mineralisation.


Mining Methods

  • Truck & Shovel / Loader

Source: p.113-114

Summary:

Damang has two open pits constituting the Mineral Reserves, seven open pits comprising the Mineral Resources, one ore stockpile.

Using open-pit, conventional drill and blast with truck and shovel methods, mining operations are carried out by contract mining. Mining is focused on the Damang complex. Gold mineralisation is mined selectively to COG and segregated into grade ranges to balance ore production and processing capacities. The east wall of Damang has been monitored to mitigate geotechnical challenges, with additional controls implemented to ensure safe operations. There were no changes in the wall angles over the past 18 months. The east wall is now used as a geotechnical berm (and second form of egress) to catch any material movement off the upper east wall. Drape meshing in hard rock has been done for the majority of the wall to prevent scats plus ongoing pre-split and wall control blasting.

Deposition of tailings is occurring on the Far East TSF (FETSF), which was commissioned in January 2018. In addition, the second stage of the downstream embankment lift, which commenced in November 2019, has been completed. The third stage of construction activities commenced in 2021.

The East TSF (ETSF) was constructed as a combined TSF and waste dump using compacted earth fill and fresh waste rock for the embankment construction. Closure deposition of tailings into the ETSF was embarked upon in early 2017 until January 2018 when the deposition ceased.

The FETSF is located south of the existing ETSF abutting the ETSF’s south embankment. The FETSF has been designed and constructed with a compacted clay liner across the facility basin and upstream slopes. The facility is planned to be constructed through five stages and has a remaining LoM storage capacity of approximately 18Mt. The ANCOLD consequence classification for FETSF is High C. The South TSF (STSF), also with earth fill embankments, has been closed and is fully rehabilitated. The ETSF and STSF have an ANCOLD consequence classification of High B and Significant, respectively.

Mining in the Damang pit will be completed in 2022; only the Huni and the small Lima Kwesi Gap (LKG) pit will be mined in 2023. The processing plant is planned to continue through to 2025 treating stockpiled lower grade ore.

Mining of the Huni pit extension was approved in early 2021, and mining commenced in H1 2021 and will be completed in 2023.


Crushing and Grinding
Flow Sheet: Source
Source: Source
Crusher / Mill TypeModelSizePowerQuantity
Gyratory crusher ThyssenKrupp 54" x 75" 1
Cone crusher Sandvik CS660 2
Cone crusher Sandvik CH440 5
Pebble crusher 2
SAG mill 8.0m x 5.1m 5.8 MW 1
Ball mill 6.1m x 9m 5.8 MW 1

Summary:

ROM ore is crushed using a gyratory crusher followed by a secondary and tertiary crushing stages and subsequently stockpiled. Ore is then fed to a milling circuit consisting of a SAG (semi autogenous grinding) mill in a closed circuit with two pebble crushers and ball mill. The milled ore is classified by means of a cyclone with the overflow reporting to a pre-leach thickener. The thickened leach feed (50% solid density) reports to the eight CIL tanks (3000 m3 each). The final leach tails report to two tails tanks and pumped to the tailings dam. The cyclone underflow returns to the ball mill for regrinding.


Processing

  • Gravity separation
  • Centrifugal concentrator
  • Smelting
  • Carbon re-activation kiln
  • Filter press plant
  • Agitated tank (VAT) leaching
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Source
Source: Source

Summary:

The Damang Mine operates a carbon-in-leach (CIL) processing plant which is fed run-of-mine (ROM) ore at approximately 12,600 dry tonnes per day (4.5 million tonnes per annum). Plant feed consists of 100% fresh (blasted) hard rock.

The milled ore is classified by means of a cyclone with the overflow reporting to a pre-leach thickener. The thickened leach feed (50% solid density) reports to the eight CIL tanks (3000 m3 each). The final leach tails report to two tails tanks and pumped to the tailings dam. The cyclone underflow returns to the ball mill for regrinding.

The underflow stream is also bled to feed 2 x 48” Knelson concentrators. The concentrate from the Knelsons is leached directly in an in-line leach reactor (ILR) at high cyanide concentration. The leached tails from the ILR reports to the Ball Mill for regrinding after the clarified pregnant solution has been transferred to the electrowinning circuit and the remaining solids have been subjected to several wash cycles using raw water. The wash water is collected into either the electrowinning circuit or transferred to the CIL circuit for recovery of residual soluble gold, depend on the stage of washing. The pre leach thickener overflow joins the process water pond as recycled water. Loaded carbon from the CIL is acid washed and eluted at high pressure and temperature. Gold is finally recovered by electrowinning of the pregnant solution and smelting of the cathodes with flux.

The cyanide facilities at the Damang Gold Mine are:
- solid cyanide storage area; ? mixing and storage tanks;
- leaching facilities, including CIL tanks and ILR;
- tailings storage tanks; and
- tailings storage facility and tailings delivery pipeline.

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Gold Recovery Rate, % 93919294.192.291.990.9
Gold Head Grade, g/t 1.81.61.511.421.051.181.33

Production:

CommodityUnits2022202120202019201820172016
Gold koz 229 ^254223208181144148
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.

Operational Metrics:

Metrics202120202019201820172016
Total tonnes mined 24,023 kt29,229 kt34,098 kt45,937 kt39,726 kt18,846 kt
Ore tonnes mined 8,271 kt6,680 kt4,680 kt4,495 kt3,329 kt2,819 kt
Waste 15,752 kt22,549 kt29,418 kt41,442 kt36,397 kt16,027 kt
Tonnes milled 4,720 kt4,798 kt4,645 kt4,205 kt4,590 kt4,268 kt
Stripping / waste ratio 1.9 3.4 6.29 9.22 10.9 5.68
Annual processing capacity 4.6 Mt4.5 Mt4.5 Mt4.2 Mt
Daily processing capacity 12,600 t

Reserves at December 31, 2021:
Mineral Resources cut-off for fresh ore 0.61 – 0.86 g/t;
Mineral Resources cut-off for oxide ore 0.52 – 0.66 g/t;
Mineral Reserves cut-off for fresh ore 0.67 – 0.75 g/t;
Mineral Reserves cut-off for oxide ore 0.57 – 0.65 g/t.

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 8,227 kt Gold 0.87 g/t 229 koz
Proven In-Situ (OP) 1,233 kt Gold 1.21 g/t 48 koz
Proven Total 9,460 kt Gold 0.91 g/t 277 koz
Probable In-Situ (OP) 7,795 kt Gold 1.44 g/t 360 koz
Proven & Probable Stockpiles 8,227 kt Gold 0.87 g/t 229 koz
Proven & Probable In-Situ (OP) 9,028 kt Gold 1.4 g/t 408 koz
Proven & Probable Total 17,255 kt Gold 1.15 g/t 637 koz
Measured Stockpiles 8,230 kt Gold 0.91 g/t 241 koz
Measured In-Situ (OP) 5,374 kt Gold 1.68 g/t 289 koz
Measured Total 13,603 kt Gold 1.21 g/t 531 koz
Indicated In-Situ (OP) 52,051 kt Gold 2.05 g/t 3,438 koz
Inferred Stockpiles 933 kt Gold 0.59 g/t 18 koz
Inferred In-Situ (OP) 8,981 kt Gold 2.04 g/t 589 koz
Inferred Total 9,914 kt Gold 1.9 g/t 606 koz
Total Resource Stockpiles 9,163 kt Gold 0.88 g/t 259 koz
Total Resource In-Situ (OP) 66,406 kt Gold 2.02 g/t 4,316 koz
Total Resource Total 75,568 kt Gold 1.88 g/t 4,575 koz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
All-in sustaining costs (sold) Gold USD 802 / oz† 1,008 / oz† 809 / oz† 813 / oz† 1,027 / oz† 1,254 / oz† 1,326 / oz†
All-in costs Gold USD 852 / oz† 1,035 / oz† 1,147 / oz† 1,506 / oz† 1,827 / oz† 1,254 / oz† 1,326 / oz†
^ Guidance / Forecast.
† Net of By-Product.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD 52  
Growth Capital M USD 6  6  
Sustaining costs M USD 17.4  14  5.8  14   17.2   37.9  
Capital expenditures M USD 23.4  20  76.3  139   132   37.9  
Revenue M USD 457.5  400.8  288.3  229   180.3   183.4  
After-tax Income M USD 98.7  45.2  25.5  -8.3   20.4   -4.5  


Heavy Mobile Equipment as of December 31, 2020:
Source: Source p.94
HME TypeModel
Excavator Liebherr EX96
Truck (dump) Caterpillar 777

Mine Management:

Job TitleNameProfileRef. Date
Drilling & Blasting Manager Abraham Beni LinkedIn Apr 12, 2022
General Manager Michiel Van Der Merwe LinkedIn Apr 12, 2022
Metallurgical Manager Catherine Kuupol Kuutor LinkedIn Apr 12, 2022
Mine Planning Manager John Ankomah LinkedIn Apr 12, 2022
Mining Manager Charles Kofi Nti LinkedIn Apr 12, 2022


Corporate Filings & Presentations:

DocumentYear
Financial Review 2021
Form 20-F 2021
Integrated Report 2021
Other 2021
Year-end Mineral Reserves 2021
Annual Report 2020
Financial Review 2020
Form 20-F 2020
Other 2020
Year-end Mineral Reserves 2020
Corporate Presentation 2019
Financial Review 2019
Integrated Report 2019
Year-end Mineral Reserves 2019
Form 20-F 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
Annual Report 2014
Financial Review 2014
Technical Report 2012

Aerial view:

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