Overview
Stage | Production |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Longhole stoping
- Transverse open stoping
- Longitudinal retreat
- Cemented backfill
- Backfill
|
Production Start | ...  |
Mine Life | 11 years (as of Jan 1, 2022) |
Mana mine was acquired by Endeavour in July 2020 and the focus ever since has been on increasing the mine life to more than ten years, through the expansion of the underground deposits and evaluating local open pit targets. |
Source:
p. 50
Mana's mineral rights comprise of one mining exploitation permit. The Mana License is held by Semafo Burkina Faso. Endeavour, indirectly through its subsidiary Semafo (Barbados) Ltd., holds a 90% stake in Semafo BF. The remaining 10% interest in Semafo BF is held by the State of Burkina Faso.
Contractors
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Deposit Type
- Vein / narrow vein
- Orogenic
Summary:
The Mana district is located in the northern part of the Houndé greenstone belt. Five gold deposits, WonaKona, Nyafé, Fofina, Yaho and Siou, are hosted in different rock types. The lithostratigraphic succession is typical of greenstone belts and is characterized at the base by a major tholeiitic basaltic suite with some intercalations of argillic sedimentary rocks that are overlain by predominant pelagic and detrital sedimentary rocks (shale, sandstones, greywacke and volcanoclastics). The Mana district basalt unit has undergone submarine hydrothermal alteration with epidote, chlorite and local albite, and shows zones of strong silicification, some of which are anomalous in gold. The Paleoproterozoic formations are affected by polyphase deformation and greenschist facies metamorphism with amphibolite facies assemblages that locally occur as metamorphic aureoles around some later formed granitoids.
All deposits on the Mana property are characterized as typical West African, shear-hosted orogenic gold deposits. The major sulphides associated with the gold mineralization are pyrite and arsenopyrite. Free visible gold is encountered at the Wona-Kona and Siou deposits. Magnetite occurs as small millimetric prisms along schistosity planes in the walls of mineralized zones. The five major deposits of the Mana property are described below.
The Wona-Kona deposit is hosted in a series of deformed sedimentary, volcano-sedimentary and metavolcanic rocks. The gold mi ........

Mining Methods
- Truck & Shovel / Loader
- Longhole stoping
- Transverse open stoping
- Longitudinal retreat
- Cemented backfill
- Backfill
Summary:
Two mining methods are employed at the Mana Mine, namely open pit and underground.
UNDERGROUND MINING AT SIOU
Longitudinal sublevel retreat and transverse open stope long-hole mining methods were selected for Siou underground due to the inclination of mineralised lenses and varying widths associated with wide stockwork ore zones. Stopes are designed with suitable allowances for ore recovery and dilution. Transverse open stoping is the main mining method and Cemented Rock Fill (CRF) is used to ensure safe ore recovery from secondary transverse stopes. Waste rock backfill is used in secondary stopes in all levels other than sill levels (5070 and 4995). Large sill pillars have been left in the first horizon under 5070 level and the second horizon under 4995 level. In 2022, the mine commenced with planning the extraction of a number of these sill pillar stopes. The extraction strategy includes a mining sequence that follows Geotechnical recommendations, an assessment of the regional stability in terms of stress re-distribution and a sound void management strategy in terms of the mining sequence and monitoring of the stability of the undercut backfill on the upper levels. These assessments and strategies will be concluded in 2023 prior to the extraction of the first undercut stope.
WSP-Golder was retained to undertake the geotechnical and hydrogeological analysis of the underground project at Siou, including stope dimension, ground support and crown pi ........

Source:

- subscription is required.
Flow Sheet:
Summary:

- subscription is required.
Production:
Commodity | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Gold
|
koz
| ...... ^ | ......  | ......  | ......  | ......  | 181 | 206 |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
Daily processing capacity
| ......  | ......  | 8,000 t | 8,000 t | 8,000 t | 8,000 t |
Ore tonnes mined
| ......  | ......  | 2,216 kt | 1,437,400 t | 2,109,700 t | 2,268,100 t |
Waste OP
| ......  | ......  | 14,742 kt | 9,253,800 t | 17,802,100 t | 16,913,100 t |
Waste UG
| ......  | ......  | 281 kt | | | |
Total tonnes mined
| ......  | ......  | 25.6 Mt | | | |
Tonnes processed
| ......  | ......  | 2,433 kt | 2,061,200 t | 2,573,900 t | 2,739,900 t |
Daily ore mining rate
| ......  | ......  | 7,000 t | | | |
Stripping / waste ratio
| ......  | ......  | | | 8.4 | 7.5 |
Daily mining capacity
| ......  | ......  | | | | |
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Reserves at December 31, 2022:
Cut-off grades for the resources are as follows: open pit for oxide at 0.41g/t Au to 0.56g/t Au, for transitional 0.44g/t Au to 0.69 g/t Au, and sulphide at 0.72g/t Au to 2.54g/t Au.
Cut-off grades for the reserves are as follows: Mana OP: Not Applicable. Mana UG: Siou cut-off grade: 2.35g/t Au; Wona cut-off grade: 2.23g/t Au.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
Mt
|
Gold
|
1.85 g/t
|
1 koz
|
Probable
|
8.3 Mt
|
Gold
|
3.19 g/t
|
852 koz
|
Proven & Probable
|
8.3 Mt
|
Gold
|
3.19 g/t
|
852 koz
|
Measured
|
7.8 Mt
|
Gold
|
1.83 g/t
|
460 koz
|
Indicated
|
26.1 Mt
|
Gold
|
2.04 g/t
|
1,718 koz
|
Measured & Indicated
|
34 Mt
|
Gold
|
1.99 g/t
|
2,177 koz
|
Inferred
|
2.9 Mt
|
Gold
|
3.48 g/t
|
326 koz
|
Pipelines and Water Supply
Source:

- subscription is required.
HME Type | Model | Size | Quantity | Status | Leased or Contractor | Ref. Date |
Backhoe
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6.5 cu. m
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Existing
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Dozer
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Existing
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Dec 31, 2017
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Drill
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Existing
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Dec 31, 2017
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Drill
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Existing
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Dec 31, 2017
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Drill
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Existing
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Dec 31, 2017
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Drill
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Existing
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Dec 31, 2017
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Drill
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Existing
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Excavator
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10 cu. m
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Existing
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Dec 31, 2017
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Excavator
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6.5 cu. m
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Existing
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Dec 31, 2017
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Excavator
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Existing
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Dec 31, 2017
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Excavator
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Existing
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Dec 31, 2017
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Grader
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Existing
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Loader
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Existing
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Scoop Tram
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Existing
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Apr 1, 2020
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Proposed
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Dec 31, 2017
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Truck (haul)
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65 t
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Existing
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Dec 31, 2017
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Truck (haul)
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90 t
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Existing
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Dec 31, 2017
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Truck (haul)
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Existing
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Proposed
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Dec 31, 2017
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Truck (water)
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50 cu. m
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.......................
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Existing
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Dec 31, 2017
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Corporate Filings & Presentations:
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