Operating highlights | 20231 | 2024E1 |
---|---|---|
Gold production (koz) | 78.6 | 126 – 138 |
AISC2,3,4 (US$/oz AuEq) | 760 | 1,110 – 1,230 |
Geology and mineralization
The Séguéla Mine is situated within the Paleoproterozoic (“Birimian”) Baoule-Mossi Domain of the West African Craton. Two cycles of volcanism/sedimentation are recognised within the Birimian rocks of the Baoule-Mossi Domain; each followed by a period of orogenesis, and together described as the Eburnian Orogeny which is dated c. 2.19–2.08 Ga. Rocks of the Baoule-Mossi Domain are primarily polyphase granitoids, and volcano-sedimentary sequences forming granite-greenstone terranes. The first cycle of sedimentation and orogenesis (“Eburnian 1”) is described by the accumulation of volcanic and volcaniclastic rocks; then subsequently intruded by early stage granitoids. Following a period of uplift and erosion, the Eburnian 2 cycle is described by the filling of intra-montaine basins with predominantly arenaceous sediments of the Tarkwaian Series.
Mineral reserves
11.8 million tonnes
averaging 3.05 g/t Au containing 1.2 Moz Au
Refer to Mineral Reserves and Resources table below for full disclosure
- The Antenna deposit occurs within a greenstone package deposited during Eburnian 1, is an orogenic lode-style gold system, hosted by a brittle-ductile quartz-albite vein stockwork predominantly contained within flow banded rhyolite units.
- The Koula deposit is located approximately one kilometer to the east of Antenna and was discovered through field reconnaissance and coincident recent artisanal workings in an area previously considered to be a lower exploration priority. Results from the first of four drill holes testing the projected depth extensions approximately 120 meters down-plunge from the previously deepest intersection of 14 meters at 4.3 g/t Au included an intersection of six meters at 10.8 g/t Au from 355 meters downhole.
- The Ancien deposit is associated with an interpreted D2 sinistral shear zone. Significant mineralization is restricted to the more reactive and competent tholeiitic basalt unit and is best developed in zones of strong brittle-ductile brecciation and shearing, with selective sericite+/-silica alteration and intense quartz and quartz-carbonate veining.
- The Boulder and Agouti prospects are both located within a distinct northerly-trending litho-structural corridor that extends from Boulder in the south to Gabbro in the north. Gold mineralization at the Boulder and Agouti prospects is associated with strongly foliated or mylonitized, quartz/quartz-carbonate veined basalt and the margins of the felsic intrusives.
- The Sunbird deposit is hosted in the same mafic lithological package as Ancien and Koula, with the setting analogous to Koula. Hosted within a strongly foliated and sheared tholeiitic basalt unit, mineralization is best developed in discrete zones of strong shearing with associated biotite-sericite alteration and quartz-carbonate veining. Visible gold to 5mm is common within quartz veins, similar to what is also seen at Ancien and Koula. Mineralization remains open at depth.
Mineral reserves and resources
Contained Metal | ||||
---|---|---|---|---|
Property | Classification | Tonnes (000) | Au (g/t) | Au (koz) |
Mineral Reserves – Proven and Probable | ||||
Séguéla, Côte d’Ivoire | ||||
Stockpiles | Proven | 436 | 2.06 | 29 |
Antenna | Probable | 4,354 | 2.30 | 321 |
Koula | Probable | 1,445 | 5.77 | 268 |
Ancien | Probable | 1,811 | 3.80 | 221 |
Agouti | Probable | 905 | 2.39 | 70 |
Boulder | Probable | 710 | 1.73 | 39 |
Sunbird | Probable | 2,102 | 3.04 | 206 |
Combined | Proven + Probable | 11,763 | 3.05 | 1,154 |
Mineral Resources – Measured and Indicated | ||||
Séguéla, Côte d’Ivoire | ||||
Open pit (OP) | ||||
Antenna | Indicated | 1,333 | 1.32 | 57 |
Koula | Indicated | 54 | 5.84 | 10 |
Ancien | Indicated | 195 | 2.79 | 17 |
Agouti | Indicated | 298 | 1.69 | 16 |
Boulder | Indicated | 433 | 1.13 | 16 |
Sunbird | Indicated | 548 | 1.77 | 31 |
OP Combined | Measured + Indicated | 2,860 | 1.60 | 147 |
Underground (UG) | ||||
Koula | Indicated | 45 | 4.54 | 7 |
Ancien | Indicated | 192 | 3.79 | 23 |
Sunbird | Indicated | 1,562 | 4.05 | 203 |
UG Combined | Measured + Indicated | 1,799 | 4.03 | 233 |
Combined | Measured + Indicated | 4,659 | 2.54 | 381 |
Mineral Resources – Inferred | ||||
Séguéla, Côte d’Ivoire | ||||
Open pit | ||||
Antenna | Inferred | 1,734 | 1.61 | 90 |
Koula | Inferred | 373 | 4.44 | 53 |
Ancien | Inferred | 17 | 0.89 | 1 |
Agouti | Inferred | 49 | 1.53 | 2 |
Sunbird | Inferred | 23 | 2.29 | 2 |
OP Combined | Inferred | 2,196 | 2.09 | 147 |
Underground | ||||
Koula | Inferred | 290 | 3.24 | 30 |
Ancien | Inferred | 154 | 3.82 | 19 |
Sunbird | Inferred | 419 | 3.62 | 49 |
UG Combined | Inferred | 863 | 3.53 | 98 |
Combined | Inferred | 3,059 | 2.50 | 245 |