Highlights
- NI 43-101 resource on Gongondy and Dienemera now over 2 billion pounds of copper and 3.4 million ounces of gold at a copper-equivalent grade of 0.53%, with both deposits still open along strike and down dip
- Large wholly-owned land position on 3 contiguous concessions, comprising 558 km2 with over 35 km strike of copper-gold porphyry corridor
- Two deposits contributing to current resources PLUS two additional deposits drilled confirming porphyry mineralization AND multiple untested, co-incident geophysical/geochemical targets
- Largest of only few copper porphyry-style deposits identified to date in West Africa
The Gaoua Copper-Gold Porphyry Deposits
The Gaoua project covers 558 kmē near the southern limit of the Boromo greenstone belt, an early Proterozoic Birimian sequence of the West African Craton. The project includes the wholly-owned, contiguous Malba, Souhouera and Danyoro concessions, which hosts numerous copper-gold and gold prospects previously identified by historical aid programs. The three permits lie near the regional town of Gaoua.
These concessions cover about 35km in strike length of the prospective structural corridor that host copper-gold porphyry deposits at Gaoua. Global expert review (by Dr. Richard Sillitoe) of the historical exploration data, along with core and data produced during current exploration efforts, confirmed the Gaoua deposits exhibit characteristics that classifies them as being classic porphyry-style copper and gold mineralization.
To date, drilling by Volta has delineated 304 million tonnes containing over 2 billion pounds of copper and over 3 million ounces of gold at a copper-equivalent grade of 0.53% from two deposits, Gongondy and Dienemera. These resources are contained in optimised open pits at a copper-equivalent cut-off grade of 0.3%. Cut-off grades are based on a price $1,400 per ounce of gold and $7,500 per tonne of copper and recoveries of 85% for copper and 70% for gold. Significantly, both deposits remain open along strike and down dip.
A Gradient Array Induced Polarization geophysical study carried out along the porphyry corridor between and on strike of Gongondy and Dienemera demonstrated the continuity of the corridor and yielded two additional targets, Mont Biri and Bouserra. Drilling undertaken on both of these targets has confirmed similar economic grades and widths of porphyry-style copper and gold mineralization as encountered in the resource deposits.
Volta Resources undertook a high resolution, helicopter-borne geophysical survey over the entire project area. A 3D Inversion study on the magnetic data, combined with radiometric and geochemical survey data has yielded another +20 first class targets that warrant further follow-up. Therefore there is potential to significantly grow the copper and gold resources at Gaoau.
Category | Deposit | Tonnes (t) | Copper | Gold | Copper Equivalent | |||
---|---|---|---|---|---|---|---|---|
% Cu | (Cu lbs) | Au g/t | (Au oz) | % CuEQ | (CuEQ lbs) | |||
Indicated | Gongondy Dienemera |
22,020,000 | 0.29 | 138,577,000 | 0.33 | 236,300 | 0.49 | 235,807,000 |
Subtotal | 22,020,000 | 0.29 | 138,577,000 | 0.33 | 236,300 | 0.49 | 235,807,000 | |
Inferred | Gongondy | 185,260,000 | 0.28 | 1,129,216,000 | 0.44 | 2,631,600 | 0.54 | 2,211,874,000 |
Dienemera | 97,150,000 | 0.41 | 878,764,000 | 0.17 | 538,100 | 0.51 | 1,100,138,000 | |
Subtotal | 282,410,000 | 0.32 | 2,007,980,000 | 0.35 | 3,169,600 | 0.53 | 3,312,012,000 |