Overview
| Stage | Preliminary Economic Assessment |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 13 years (as of Jan 1, 2021) |
The Doropo Project (“Doropo”) consists of seven exploration permits, covering an area of approximately 1,850km2. |
Source:
p. 5
The Doropo Project is contained within seven (7) current exploration permits that were granted to Ampella Mining Cote d’Ivoire and Ampella Mining Exploration Cote d’Ivoire, which are both 100% owned Ivoirian subsidiaries of Centamin. The block of permits covers a total area of 1,847 km2.
Contractors
- Subscription is required.
Summary:
The Doropo Project currently includes thirteen distinct mineralised bodies that host the actual resource plus numerous prospects and geochemical surface anomalies yet to be tested, fitting an area of about 170 km2, or within a circular area of 28 km radius.
The mineral occurrences tested to date include two model types, a “classic” shear hosted gold deposit model and a quartz vein hosted gold deposit model.
The granitic complex displays lozenge-shaped arrays of anastomosing shear zones. The shears have a broad South-South-West to North-North-East orientation, dipping shallowly towards the NW. The mineralisation occurs all along the shears, which were all channel ways for the fluid flows, however at a generally lowgrade gold deposition. Significant higher grade mineralisation occurs on specific localised trend orientations, or when shears intersect, and often spatially associated with doleritic dyke swarms (Davis, 2017).
The quartz veins mainly occur along the NW-SE orientation, as sub-vertical or steeply dipping towards the SW. These veins show significant gold grades and often visible gold but have a limited width.
Mineral assemblages distal to the mineralised zones include epidote-chlorite and hematite. Hematite alteration is then pervasive at weak to medium intensity. This hematite alteration can be very strong in the vicinity of the doleritic dykes, making the vectoring towards mineralisation difficult in such areas.
Summary:
The Project basis is a contract mining operation, delivering nominally 4.0 Mtpa of ore to the ROM pad annually based on 100% fresh ore feed.
An annualised pit production schedule was produced with the primary aim of supplying ore grade material to the processing facility at a rate of 4.0 Mtpa for fresh ore and 4.5 Mtpa for the softer oxide and transition ores.
A contract mining model undertaken with the use of standard open pit mining equipment which includes diggers consisting of back-hoe configured excavators in the 100t to 200t class size, loading into circa 100t off-highway mining dump trucks delivering material to the waste dump, stockpiles and ROM pad locations in line with the material classifications. Drilling and blasting is included within the estimated mining costs as part of the contract mining assumption, with drilling and blasting typicallyassumed to be over 10m bench heights which were planned to be mined in 2.5m to 5m high mining flitches based on grade control determinations for selective mining practices.
Open pit optimisations were completed for each pit and mine production scheduled of the selected shells.
No pit designs were undertaken for this study and the selected pit shells the tonnages of which were factored to simulate ore losses of 5% and waste gains of 10% to simulate anticipated inventories fromdetailed pit designs.
The primary aim of the production schedule was to produce an ore feed within ........
Source:
- subscription is required.
Flow Sheet:
Summary:
- subscription is required.
Projected Production:
| Commodity | Units | Avg. Annual | LOM |
|
Gold
|
oz
| 150,956 | 1,962,432 |
All production numbers are expressed as metal in doré.
Operational Metrics:
| Metrics | |
|
Stripping / waste ratio
| ...... |
|
Waste tonnes, LOM
| ...... |
|
Ore tonnes mined, LOM
| ...... |
|
Total tonnes mined, LOM
| ...... |
|
Tonnes processed, LOM
| ...... |
|
Annual mining rate
| ...... |
|
Annual ore mining rate
| ...... |
* According to 2021 study.
- Subscription is required.
Reserves at October 25, 2022:
Resource estimates have been reported at 0.5 g/t gold cut-off.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Indicated
|
51.51 Mt
|
Gold
|
1.52 g/t
|
2.52 M oz
|
|
Inferred
|
13.67 Mt
|
Gold
|
1.14 g/t
|
0.5 M oz
|
Corporate Filings & Presentations:
- Subscription is required.
- Subscription is required.