In April 2024 Osisko Metals announced preliminary metallurgical and grindability testwork results from Gaspé Copper. Testwork was performed on eighteen composite samples of mineralized drill core from selected intersections of the 2023 drill program at Copper Mountain, and employed a conventional copper-molybdenum flotation flowsheet and reagents.
Highlights
- Copper recoveries averaged 91.9% from nineteen bulk Cu-Mo locked-cycle flotation tests (including one composite sample) and averaged 94.2% from three locked-cycle Cu-Mo separation tests.
- Copper concentrate grades averaged 24.1% Cu from nineteen bulk Cu-Mo locked-cycle flotation tests and averaged 28.0% Cu from three locked-cycle Cu-Mo separation tests.
- Molybdenum recoveries averaged 84.3% and concentrate grades averaged of 1.18% Mo from nineteen locked-cycle Cu-Mo bulk tests. Molybdenum recoveries averaged 72.3% and concentrate grades averaged of 0.85% Mo from three bulk Cu-Mo locked-cycle Cu-Mo separation test. Molybdenum stage recoveries average 87.2% and concentrate grade averaged 58.8% Mo. The overall combined molybdenum recoveries averaged 65.2%.
- Silver recoveries averaged 71.1% from nineteen bulk Cu-Mo locked-cycle flotation tests and averaged 71.8% from the three locked-cycle Cu-Mo separation tests, with concentrate grades averaging 120 g/t Ag for all locked-cycle tests.
- Eighteen grindability tests produced an average Bond Rod Mill Work index (RWi) of 13.8 kWh/t and an average Bond Ball Mill Work Index (BWi) of 10.5 kWh/t, indicating average hardness of mineralized material.
For more information, please consult our April 16, 2024 press release.