Intrepid Minerals (IAU-T) is pleased with metallurgical tests that indicate gold recovery bysimple gravity concentration averages 36.6% from samples taken at its Casposo gold and silver depositin San Juan Province, Argentina.
Bottle roll tests have already shown that a conventional grinding and recovery circuit could reap agold recovery of 94% and a silver-recovery of 81%.
The Instituto de Investigaciones Mineras, in Argentina, completed the gravity tests on a selection ofsamples from different zones (Inca, Mercado, Kamila and B-vein).
Seven ten-kg samples were crushed, and passed through a minus 100-mesh-size sieve. Thismaterial was passed through a Falcon concentrator.
The samples graded from 3.7-53 grams gold and 17-496 grams silver per tonne. Gold recoveryvaried from 29-42%, whereas silver recovery ranged from 7-17% (averaging 12.5%).
Gold mineralization is found within stockwork-quartz veins that cut altered intermediate to felsicvolcanic rocks.
As at May of last year, the Kamila zone had an indicated resource of 775,000 tonnes grading 5.57grams gold and 87.5 grams silver per tonne. This was calculated using a gold price of US$375 per oz.and a gold-equivalent cutoff of 1.4 grams gold per tonne.
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