Overview
Stage | Production |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
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Production Start | ... |
Mine Life | 2028 |
Edikan Gold Mine is a large-scale, low-grade multi open-pit operation located in the Central Region of Ghana.
The Nkosuo deposit is located approximately 7 kilometres north-northwest of the Edikan Gold Mine in Ghana and added substantial Mineral Resources and Ore Reserves to Edikan at 30 June 2022. Early in FY23, Perseus Mining announced the completion of the Nkosuo Feasibility Study.
A proposed enlargement of the Nanankaw ML to incorporate a portion of the western arm of the Agyakusu Prospecting Licence (“PL”), which includes the Nkosuo deposit, was approved by the Minister for Land and Resources. This is an important milestone in the delivery of the Nkosuo deposit into the Edikan Life of Mine (“LOM”).
Planned processing of the Nkosuo Ore Reserves in the Edikan mill is expected to increase the life of the Edikan operation by 18 to 24 months. |
Source:
p. 147,164
Perseus owns a 90% beneficial interest in Edikan. The remaining 10% interest in Edikan is a free carried interest owned by the Ghanaian government.
Contractors
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Deposit Type
- Breccia pipe / Stockwork
- Intrusion related
- Vein / narrow vein
- Orogenic
- Sediment-hosted
Summary:
Deposit Types
The Edikan gold deposits are structurally controlled, orogenic style gold deposits.
Gold occurs both in classic Ashanti-style sediment hosted shear zones, and within granitic plugs and sills or dykes situated along several regional shear structures.
Most of the known gold Mineral Resources at the Edikan Gold Mine are hosted by the granite plugs and sills or dykes, which occur along the same structural corridors that contain the sediment shear hosted gold occurrences. Gold mineralisation within the granites occurs in two to three generations of quartz veins and stockworks with individual veins millimetres to centimetres in thickness and rarely more than a metre thick. Gold is associated with pyrite, lesser arsenopyrite, and traces of sphalerite, chalcopyrite, galena and rutile. Mineralised quartz veining is nearly pervasive throughout the granite host bodies, rarely extending into the adjacent sediments.
The sediment-hosted shear zone deposits consist either of pinch and swell quartz reefs in relatively tight shears or quartz +/- carbonate stockwork veining in broader shear zones. Coarser grained wacke to sandstone sediments are often preferentially mineralised due to their more competent and brittle nature. Pervasive iron carbonate and more localised sericite and silica alteration has affected the host sediments, and fine-grained pyrite with lesser arsenopyrite occurs as disseminations in the host sediments and to a lesser ........
Summary:
Mineral Reserve estimates for Edikan include both open pit and underground Mineral Reserves. Edikan is an existing open pit operation, with a 10 year history of production. Open pit mining by conventional truck and excavator methods with a 180t and 100t class excavator fleet and 100t class haul truck fleet is a productive and cost-effective method of extracting near-surface Mineral Reserves.
The chosen method for the Open Pit Ore Reserves is conventional open pit mining utilising hydraulic excavators and trucks, mining bench heights of 5 metres with 2.5 metre flitches to minimise ore loss and waste rock dilution.
Overall pit slopes are 30 to 50 degrees inclusive of berms spaced at between 5 and 20 metres vertically and berm widths of 5 to 12 metres.
Pit ramps have been designed for a 100-tonne payload truck fleet and are set at 24 metres (dual lane) to 16 meters (single lane).
Minimum mining width of 40 meters was generally applied to the pit cutback designs.
Waste Dump Design Parameters
Waste dumps are designed with 15m high lifts, 10 m wide berms and using the natural angle of repose (35°) slopes during active waste placement. For rehabilitation process, the waste dump face will be re-shaped to 20° slopes to increase the long-term stability factor, erosion retention, and considering the maximum working gradient for dozers. The final slope configuration will be 15m high batters, approx. 0.5m wide berms and 20° batt ........
Source:
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Flow Sheet:
Summary:
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Source:
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Reserves at June 30, 2023:
Ore Reserves: variable gold grade cut-off for each material type, ranging from 0.30 g/t to 0.40 g/t.
Mineral Resource estimates are reported: AF Gap, Esuajah North and Fetish open pits - 0.4g/t gold cut-off applied, Nkosuo open pit - 0.3g/t gold cut-off applied, Esuajah South underground - 1.0 g/t gold cut-off applied, and Stockpile reported at zero cut-off grade.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
7.4 Mt
|
Gold
|
1.07 g/t
|
255 koz
|
Probable
|
25 Mt
|
Gold
|
1.09 g/t
|
874 koz
|
Proven & Probable
|
32.5 Mt
|
Gold
|
1.08 g/t
|
1,129 koz
|
Measured
|
15.6 Mt
|
Gold
|
1.07 g/t
|
534 koz
|
Indicated
|
46.6 Mt
|
Gold
|
1.02 g/t
|
1,523 koz
|
Measured & Indicated
|
62.2 Mt
|
Gold
|
1.03 g/t
|
2,057 koz
|
Inferred
|
6.2 Mt
|
Gold
|
1.6 g/t
|
311 koz
|
Corporate Filings & Presentations:
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