Additional drilling this year on the Brimstone deposit at the Crofoot-Lewis heap-leach mine in Nevada has boosted the resource estimate by more than 60%.
Owner Hycroft Resources & Development (VSE), a 50.5%-owned subsidiary of Granges (TSE), estimates the deposit contains 47 million tons grading 0.017 oz. gold per ton with a strip ratio of 1.7-to-1.
Infill drilling is continuing and the company expects to have a proven mining reserve in hand by the end of January.
Preliminary metallurgical work has also returned encouraging results. Samples from test pits on the northern portion of the deposit achieved relatively fast recoveries of up to 75% of the contained cyanide-soluble gold (equivalent to about 60% of the total gold) from friable uncrushed run-of-mine material.
Further studies are under way on deeper mineralization, which is in more competent rock.
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