Overview
Stage | Preliminary Economic Assessment |
Mine Type | Open Pit & Underground |
Commodities |
|
Mining Method |
- Truck & Shovel / Loader
- Longhole stoping
- Longitudinal stoping
- Cemented backfill
|
Mine Life | 9 years (as of Jan 1, 2019) |
The Nabanga Project was acquired by Endeavour in July 2020 as part of the SEMAFO transaction. The previous owners completed a Preliminary Economic Study on the project in September 2019. Endeavour is evaluating this project in the context of its overall exploration portfolio and will determine next steps. |
Source:
p. 21,88
Company | Interest | Ownership |
Government of Burkina Faso
|
10 %
|
Indirect
|
Endeavour Mining plc
|
90 %
|
Indirect
|
The Nabanga exploration permit (also known as Nabangou and the Nabanga Permit) is registered under the name of Birimian Resources, in which the Endeavour Mining plc has a 90% equity interest with the remaining 10% reflecting a carried ownership of the GoBF.
Contractors
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Deposit Type
- Vein / narrow vein
- Intrusion related
- Mesothermal
Summary:
The Yactibo Permit Group straddles a major NE-trending shear separating the Youga Belt in the northwest from the Diapaga Belt in the southeast. The Nabanga deposit is located to the southeast of the shear, in the Diapaga Belt, which is the easternmost Belt in Burkina Faso.
The Diapaga Belt is dominantly comprised of metamorphosed intermediate volcanic rocks, sediments, foliated or migmatitic granite and gneiss, with less common mafic volcanic rocks and mafic-ultramafic intrusive complexes. Conglomeratic sediments are present and are mapped as Tarkwaian equivalents. Early banded or and/or foliated granitoids, which may be ascribed to the TTG Group, are also very common.
The overall strike of the Nabanga mineralized structure is NE-SW and the dip varies between 55° and 70° toward the northwest. It has an average horizontal thickness of 3.2 m. A large proportion of the high gold values are contained within the quartz vein. The mineralization is arranged as a series of shoots plunging at 45º to the NE. The mineralization is often lower-grade and/or narrower where the main zone is hosted in the amphibolite.
The Nabanga deposit is divided into the North, Central and Southern Extension Zones. A subparallel, 800 m long structure referred to as the Nabanga North Lode is present to the NW.
The main feature on the Property is the granodiorite hosting the mineralization. The intrusion is in contact on the north with an assemblage of volcanic ........

Mining Methods
- Truck & Shovel / Loader
- Longhole stoping
- Longitudinal stoping
- Cemented backfill
Summary:
The Nabanga deposit will be mined by the use of the Open Pit and Underground mining methods.
A conventional truck/shovel operation will be used for all open pits. Drill and blast will be required almost at the beginning of the excavation work because there is almost no overburden (saprolite). Given the expected short life of the Open Pit operation, it is anticipated that a contractor will be selected and be responsible for all aspect of surface mining (operation, maintenance, office, garage erection and management).
The ramps and haul roads were designed with an overall width of 15.5 m. For double lane traffic industry practice indicates the running surface width to be a minimum of 2.5 times the width of the largest truck. The overall width of a 50-tonne haul truck is 3.9 m which results in a running surface of 9.75 m. The allowance for berms and ditches increases the overall haul road width to 15.5 m. A maximum ramp grade of ten (10) % was used. This grade is acceptable for a 50-tonne haul truck.
The open pit mining will be completed during Year 2 of the operation, and the total duration of the open pit operation is expected to be approximately 31 months.
All of the underground mining will be contracted as a turnkey project. The contractor will oversee all mining aspects including mobile, fixed equipment and the maintenance, mine services and facilities.
The underground mine has been designed for a 1,000 t/d production ........

Source:

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Flow Sheet:
Summary:

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Projected Production:
Commodity | Units | Avg. Annual | LOM |
Gold
|
oz
| 70,000 | 570,768 |
All production numbers are expressed as metal in doré.
Operational Metrics:
Metrics | |
Daily processing capacity
| 1,080 dmt * |
Annual processing capacity
| 360,000 dmt * |
Stripping / waste ratio
| 22.8 * |
Waste tonnes, LOM
| 14,058,323 t * |
Ore tonnes mined, LOM
| 2,980,434 t * |
Total tonnes mined, LOM
| 17,038,757 t * |
Tonnes processed, LOM
| 2,980,434 t * |
* According to 2019 study.
Reserves at December 31, 2019:
Cut-off grade 3.0 g/t Au.
Category | Tonnage | Commodity | Grade | Contained Metal |
Inferred
|
3,402,000 t
|
Gold
|
7.69 g/t
|
841,000 oz
|
Source:

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