Overview
Stage | Permitting |
Mine Type | Open Pit |
Commodities |
|
Mining Method |
|
Mine Life | 3 years (as of Jan 1, 2022) |
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, which was submitted to the Ghanaian Minerals Commission with an application to include land covered by the current Exploration Licence to Perseus’s existing Nanakaw Mining Lease (“ML”).
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. 17
Company | Interest | Ownership |
Government of Ghana
|
10 %
|
Indirect
|
Perseus Mining Ltd.
|
90 %
|
Indirect
|
Perseus Mining (Ghana) Ltd.
(operator)
|
100 %
|
Direct
|
Perseus owns a 90% beneficial interest in Edikan and the remaining 10% interest is a free-carried interest owned by the Ghanaian government.
Contractors
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Deposit Type
- Vein / narrow vein
- Orogenic
Summary:
The Nkosuo project is an addition to the Edikan group of gold deposits that occur near the western flank of the Ashanti Greenstone Belt in south-western Ghana. The regional geology of the Edikan property is underlain principally by Paleoproterozoic Birimian metasediments of the Kumasi-Afema basin, positioned between the Ashanti and Sefwi Greenstone Belts.
The Nkosuo prospect is a granite-hosted orogenic gold deposit similar to several deposits exploited at Perseus’s nearby Edikan Gold Mine. Edikan gold deposits occur near the western flank of the Ashanti Greenstone Belt along the Obuasi-Akropong gold corridor. The Central Ashanti property is underlain principally by Paleoproterozoic Birimian metasediments of the Kumasi-Afema basin, positioned between the Ashanti and Sefwi Greenstone Belts. The flysch type metasediments consist of dacitic volcaniclastics, greywackes plus argillaceous (phyllitic) sediments, intensely folded, faulted and metamorphosed to upper green schist facies. Minor cherty and manganiferous exhalative sediments are locally present, and graphitic schists coincide with the principal shear (thrust) zones. Numerous small Basin-type or Cape Coast-type granitoids have intruded the sediments along several regional structures. Structurally controlled gold mineralisation occurs in two principal modes: disseminated pyrite-arsenopyrite mineralisation associated with quartz veining and sericite alteration hosted by granitoids and shear-zone hosted mineralisat ........
Summary:
The chosen method of mining is conventional open pit mining utilising hydraulic excavators and trucks, mining bench heights of 5 m with 2.5m flitches to minimise ore loss and waste rock dilution. This configuration is the same as currently used for mining of similar orebodies at the nearby Edikan Gold Mine.
Nkosuo will be mined in a single open pit, with a waste dump located to the west of the pit. Ore from the pit will be trucked on a dedicated haul road to the Edikan processing plant for co-processing with ores from existing Edikan open pits and stockpiles.
Inter-ramp pit slopes are 30 to 60 degrees and vary by material weathering. Inter-ramp slopes are excluding ramp but include a 6m berm every 5m vertically in weathered material and 10m berms every 20 m in fresh rock. Additional berms are located at the top of fresh rock (10m wide), and every third bench (60 m vertically) in fresh rock (13m wide).
Pit ramps have been designed for a 100-tonne payload truck fleet and are set at 24 metres (dual lane) to 16 metres (single lane). Minimum mining with is 40m for the 100-tonne class truck fleet.
The Nkosuo pit shell is approximately 680m long, 300m wide and extends to a maximum depth of 160m.
It is assumed that all Ore Reserve material is mined and fed to the processing plant during Edikan’s mine life based on the material blending schedule and all the material is rehandled on the ROM stockpile. Stockpiles of Nkosuo low grade ........
Flow Sheet:
Summary:
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Source:
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Projected Production:
Commodity | Units | LOM |
Gold
|
koz
| 272 |
All production numbers are expressed as metal in doré.
Operational Metrics:
Metrics | |
Ore tonnes mined, LOM
| ...... |
Tonnes milled, LOM
| ...... |
* According to 2022 study.
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Reserves at June 30, 2023:
Ore Reserves: Variable gold grade cut-offs for each material type, ranging from 0.30 g/t to 0.40 g/t.
Mineral Resources: 0.4 g/t gold cut-off applied.
Mineral Resources are reported inclusive of Mineral Reserves.
Category | Tonnage | Commodity | Grade | Contained Metal |
Probable
|
11.2 Mt
|
Gold
|
1 g/t
|
358 koz
|
Indicated
|
14.5 Mt
|
Gold
|
0.91 g/t
|
423 koz
|
Inferred
|
0.9 Mt
|
Gold
|
0.9 g/t
|
27 koz
|
Commodity Production Costs:
| Commodity | Units | Average |
All-in sustaining costs (AISC)
|
Gold
|
USD
|
......
|
Assumed price
|
Gold
|
USD
|
......
|
* According to 2022 study / presentation.
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