QUEBEC – Montreal’s Aurvista Gold Corp. says preliminary metallurgical testing has recovered 92% of the gold from samples taken at the Douay gold project 50 km southwest of Matagami.
Core from the Douay project in the Abitibi Greenstone Belt frequently contains visible gold.
The average gold grade of the sample composites was 1.89 g/t gold. The samples also contained about 1.50% sulphur. Gravity and flotation were tested in series. About 26% of the gold reported to the gravity circuit, and an additional 66% was recovered by flotation. The tests indicated a strong correlation between gold recovery and sulphur recovery.
To understand the relationship between gold and sulphur in the samples, a similar series of tests was run but with the addition of cyanide leaching to treat the flotation concentrate. Average recovery in this case was 85%. If samples from the Northwest zone were excluded from these tests, the average gold extraction was 88.9%. The Northwest zone samples came from felsic volcanic rocks, whereas the other samples came from mafic volcanic and porphyry host rocks.
Aurvista expects that using a gravity-flotation-leaching flowsheet would result in capital and operating cost advantages over leaching whole ore, especially as the leach circuit would be one-tenth the size if flotation concentrate is treated.
Learn about the Douay gold project at www.AurvistaGold.com.