A new resource figure for the Croinor gold deposit in Pershing Twp., Quebec, models the deposit as a smaller, higher-grade body than had been previously thought.
The calculation, prepared by consulting firm Innovexplo for owners South Malartic Exploration (MSU-V), gives Croinor 1.4 million tonnes at an average 6.3 grams gold per tonne, based on a 2-gram cutoff grade. Increasing the cutoff to 5 grams per tonne shrinks the tonnage to 620,000 tonnes, with an increase in grade to 10.4 grams per tonne.
A 2003 resource estimate put the size of Croinor at 2.5 million tonnes grading 3.5 grams gold per tonne, in measured and indicated categories. Some production from the Croinor pit began but the mined material did not meet the grades predicted by the resource model and mine plan.
The new resource is in 38 veins in the Croinor diorite intrusion, and about 1.1 million tonnes, grading 6.4 grams per tonne, makes it as a “continous resource.” Another 308,000 tonnes with an average grade of 6.3 grams per tonne is in isolated blocks, pierced by only one drill intersection that meets the estimate’s cutoff criteria. The company says it will need to drill those areas more tightly to define the shape and size of that part of the resource.
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