Overview
Stage | Production |
Mine Type | Underground |
Commodities |
|
Mining Method |
- Longhole stoping
- Longitudinal stoping
- Cemented backfill
|
Production Start | ...  |
Mine Life | 6 years (as of Jan 1, 2021) |
The Yaramoko Mine Complex consists of two high- grade underground gold mines: the 55 Zone and Bagassi South.
Recent exploration drilling and a review of mine engineering designs in 2020 and 2021 supports the development of an open pit mine, at the completion of the 55 Zone underground mine, which includes the mining of near surface mineralization remaining in the crown pillar and remnant mineralization from earlier underground mining. Open pit mining would only commence at the conclusion of underground mining due to the need to remove certain key surface infrastructure associated with the underground mine. |
Latest News | Fortuna reports on Yaramoko’s updated reserves and resources evaluation work and its Brownfields exploration program January 27, 2023 |
Source:
p. 14, 15, 35, 52
Company | Interest | Ownership |
Government of Burkina Faso
|
10 %
|
Indirect
|
Fortuna Silver Mines Inc.
|
90 %
|
Indirect
|
Roxgold SANU S.A.
(operator)
|
100 %
|
Direct
|
Fortuna Silver Mines Inc. operates the underground Yaramoko mine in southwestern Burkina Faso.
Roxgold SANU S.A. is the principal subsidiary of the Fortuna Silver Mines.
Roxgold SANU S.A. – operates the Yaramoko gold mine.
The non-controlling interest represents a 10% interest in the legal entity that owns the Yaramoko property, by the Burkina Faso government.
Contractors
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Deposit Type
- Orogenic
- Vein / narrow vein
- Hydrothermal
Summary:
Primary gold deposits in Burkina Faso occur within the Paleoproterozoic Birimian belt. Mineralization was synchronous with regional metamorphism and deformation. Gold deposits found within the Birimian greenstone belts of the West African shield are typically late orogenic hydrothermal deposits that exhibit a strong relationship with regional arrays of major shear zones. The gold mineralization is typically associated with an organized network of quartz veins containing subordinate amounts of carbonate, tourmaline, sulphides, and native gold. In these deposits, the gold is typically free milling. Alternatively, gold mineralization can also be associated with disseminated sulphides in strongly deformed alteration zones. In the alteration zones, gold may be free milling, but also refractory.
Gold mineralization is related to regional arrays of alteration and deformation zones, commonly located at major lithological discontinuities. The local controls on the distribution of the gold mineralization are structural and lithological.
In Burkina Faso, the weathering profile is deep and typically results in extensive surface oxidation of bedrock to a depth reaching more than 100 metres locally. In such areas, gold deposits typically comprise a surface oxide zone, an intermediate transition zone, and a deeper fresh rock zone. Gold is typically free milling in the oxide zone.
The gold mineralization found at the 55 Zone and Bagassi South Zone deposits i ........

Mining Methods
- Longhole stoping
- Longitudinal stoping
- Cemented backfill
Summary:
Mining operations at Yaramoko are comprised of the 55 Zone underground mine, which was commissioned in 2016, and Bagassi South underground mine, which was commissioned in 2019.
Longitudinal longhole stoping with delayed cemented rockfill is the primary mining method adopted for both underground mines. Other than sill pillar stopes, up holes are drilled to breakthrough and surveyed to ensure drilling accuracy prior to production blasting. Sill pillar stopes are drilled as blind up hole stopes as these are the final level to be mined in a panel of four or three for 55 Zone and Bagassi South respectively. A longitudinal stope mining sequence, along strike from vein extremities retreating to a central access in an east and west direction.
Each stope is mined in this fashion over a 25 m strike length for 55 zone and 10 m strike length for Bagassi South.
Blast holes generally consist of parallel up holes utilizing a dice five or zipper drilling pattern due to the narrow nature of the orebody. Holes range from 12 m to 17 m in length, with some drillholes fanned out where vein widths exceed 5.0 m. Drill factors average 2.5 t to 3.5 t per drill meter, common factor for narrow vein ore bodies. Blast holes are loaded with ammonium nitrate fuel oil (ANFO) and low-density ANFO for perimeter control to a powder factor ranging from 1.00 to 1.50 kg per tonne for the initial void firings and 0.50 to 1.00 kg/t for ring firings. Any wet holes are charged with ........

Source:

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Flow Sheet:
Summary:

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Reserves at December 31, 2021:
Mineral Reserves for Yaramoko are reported at a cut-off grade of 0.9 g/t Au for the 55 Zone open pit, 3.4 g/t Au for 55 Zone underground and 3.0 g/t Au for Bagassi South underground.
Yaramoko Mineral Resources are reported in situ at a gold grade cut-off grade of 0.5 g/t Au for the 55 Zone open pit and 2.7 g/t Au for underground.
Category | Tonnage | Commodity | Grade | Contained Metal |
Proven
|
300 kt
|
Gold
|
3.78 g/t
|
36 koz
|
Probable
|
1,826 kt
|
Gold
|
7.27 g/t
|
427 koz
|
Proven & Probable
|
2,126 kt
|
Gold
|
6.78 g/t
|
464 koz
|
Measured
|
48 kt
|
Gold
|
5.83 g/t
|
9 koz
|
Indicated
|
456 kt
|
Gold
|
5.8 g/t
|
85 koz
|
Measured & Indicated
|
504 kt
|
Gold
|
5.8 g/t
|
94 koz
|
Inferred
|
247 kt
|
Gold
|
4.41 g/t
|
35 koz
|
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