Osisko Metals Incorporated (TSXV: OM | OTCQX: OMZNF | FRANKFURT: 0B51) has announced preliminary metallurgical and grindability testwork results from its Gaspé Copper Project located near Murdochville in the Gaspé peninsula, Québec.
Testwork was performed on 18 composite samples of mineralized drill core from selected intersections of the 2023 drill programme at Copper Mountain, and employed a conventional copper-molybdenum flotation flowsheet and reagents.
“Preliminary testwork on Copper Mountain material has produced excellent numbers. At approximately 92% average copper recoveries and 65% molybdenum recoveries, these results indicate that Gaspé Copper should produce both copper and molybdenum concentrates with excellent metal grades and a payable silver credit added to the copper concentrate.” Said Robert Wares, CEO, and Chairman. “These results have surpassed expectations relative to historical numbers from past production at Copper Mountain and will provide positive input into ongoing PEA work.”
The company has reported that copper recoveries averaged 91.9% from 19 bulk Cu-Mo locked-cycle flotation tests (including one composite sample) and averaged 94.2% from three locked-cycle Cu-Mo separation tests, and copper concentrate grades averaged 24.1% Cu from 19 bulk Cu-Mo locked-cycle flotation tests and averaged 28.0% Cu from three locked-cycle Cu-Mo separation tests.
Further, Molybdenum recoveries averaged 84.3% and concentrate grades averaged of 1.18% Mo from 19 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.
Finally, 18 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.
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