Overview
| Stage | Production |
| Mine Type | Open Pit |
| Commodities |
|
| Mining Method |
|
| Production Start | ...  |
| Mine Life | 6 years (as of Jan 1, 2021) |
In July 2022, Robex and Vivo Energy finalized the hybrid solar power plant of the Nampala gold mine in Mali. This plant, funded by Vivo Energy, is expected to reduce the carbon footprint by approximately 60,000 tons over ten years. |
Source:
p. 5,78
| Company | Interest | Ownership |
|
Government of Mali
|
10 %
|
Indirect
|
|
Robex Resources Inc.
|
90 %
|
Indirect
|
|
Nampala SA.
(operator)
|
100 %
|
Direct
|
Robex Resources currently operates the Nampala mine. Nampala SA is 90% owned by Robex. The Malian government was awarded 10% of Nampala SA's shares for free.
Contractors
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Deposit Type
- Vein / narrow vein
- Mesothermal
Summary:
Specifically, the Nampala deposit can be classified as a turbidite-hosted structurally controlled orogenic (mesothermal) lode-gold system.
Gold mineralization is primarily hosted in competent coarse-grained sedimentary rock where brittle fracturation, openings and veining occurred. Gold is associated to structurally controlled tension quartz vein systems and stockworks developed in the brittle fractures and in areas of increased porosity as a result of the deformation of the more competent coarse-grained greywacke, siliciceous sandstone and sandstone.
Shear zones are developed in the more ductile adjacent (or locally intercalated) shales (particularly the graphitic shale) and are commonly barren. Some narrow NNE-trending subvertical shear corridors are exposed in the pit from north to south and have been traced nearly continuously to the southernmost drill hole of the 2017-2018 drilling program.
Some anomalous gold values can also be found locally in the chill margins or along the contact of the intermediate intrusives. Local brittle deformation seems to have created space for tension quartz veins to penetrate the fringe of the stock and this seems to be confirmed by resistivity and conductivity geophysical maps which display what seem to be a slight NE/SW and NW/SE fracture pattern. This corresponds to the general orientation of the mineralization in the mine where mineralized domains are oriented 020°N and are controlled laterally by subve ........
Summary:
The Nampala Mine is excavated using a conventional truck and shovel operation. The widest equipment used by the contractors is a Caterpillar 773B haul truck matched with a 385 hydraulic excavator. The ore and waste are composed mostly of saprolite located in the oxidized horizon. No drilling and blasting are required to access the current Mineral Reserve. A total of 7 pits are planned to recover the identified Mineral Reserve.
The pit designs follow closely the Pit Shell provided by the pit optimizer when evaluating the Mineral Reserve and the pit design parameters. The access ramp centerline follows mostly the Pit Shell of the Mineral Reserve. For operational purposes, only openings identified by the optimizer which are wider than 100 m in diameter are converted to pit designs.
Pit design parameters:
- Ramp Grade - 10%;
- Bench height - 10 m;
- Minimum catch bench width - 5 m;
- Maximum face angle - 70o;
- Design face angle - 67o;
- Maximum pit slope - 45o;
- Minimal opening diameter - 100 m.
The ore body is subvertical and located predominantly in the center of each pit. This allows the access ramps to be positioned mostly in the waste to avoid leaving ore in the pit walls. Also, since the Lower Transition material is not part of the Mineral Reserve, it is left in place in the lower part of the pit. This constrains the pit design along the near-h ........
Source:
Flow Sheet:
Summary:
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Production:
| Commodity | Units | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Gold
|
oz
| ...... ^ | ...... | ...... | ...... | ...... | 44,946 | 36,997 |
All production numbers are expressed as metal in doré.
^ Guidance / Forecast.
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Operational Metrics:
| Metrics | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 |
|
Stripping / waste ratio
| ...... | ...... | 3.3 | 1.8 | 1.6 | 1.5 |
|
Ore tonnes mined
| ...... | ...... | 1,852,789 t | 1,873,721 t | 1,797,809 t | 1,451,497 t |
|
Waste
| ...... | ...... | 6,193,081 t | 3,458,443 t | 2,951,212 t | 2,184,546 t |
|
Total tonnes mined
| ...... | ...... | 8,045,870 t | | | |
|
Tonnes processed
| ...... | ...... | 1,886,318 t | 1,909,663 t | 1,795,591 t | 1,615,966 t |
|
Daily processing rate
| ...... | ...... | | | | 4,400 t |
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Reserves at February 15, 2021:
As of December 31, 2022, there were no changes in the reported Mineral Resources and Reserves at Nampala compared to February 15, 2021.
The Mineral Reserve was estimated using cut-off of 0.28 g/t in the Oxide and 0.31g/t in the Upper Transition.
The Mineral Resource was estimated using cut-off of 0.25 g/t in the Oxide, 0.33 g/t in the Transition and 0.71 g/t in the Fresh Rock.
| Category | Tonnage | Commodity | Grade | Contained Metal |
|
Probable
|
17,147 kt
|
Gold
|
0.71 g/t
|
391 koz
|
|
Indicated
|
32,282 kt
|
Gold
|
0.74 g/t
|
772 koz
|
|
Inferred
|
555 kt
|
Gold
|
0.9 g/t
|
16 koz
|
|
Total Resource
|
32,838 kt
|
Gold
|
0.75 g/t
|
788 koz
|
Source:
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Corporate Filings & Presentations:
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