The latest batch of bottle roll metallurgy tests by Gammon Lake Resources (GAM-T) have confirmed the consistency of metallurgical recoveries between and within the individual deposits tested at the company’s Ocampo gold-silver project in Mexico’s Chihuahua State.
The twenty-five latest bottle role tests were completed on samples from the Picacho, Plaza de Gallos, Refugio and Conico deposits. Over 96 hours, the tests yielded average recoveries of 97% for gold and 88% for silver. So far, Kappes, Cassiday & Associates have completed a total of 48 bottle roll tests with average gold recovery coming in at 97% gold and silver recoveries averaging 86%. Reagent consumption for the 48 tests average 0.4 kg sodium cyanide and 1.86 kg lime per tonne.
results of the tests will be used to pinpoint the sites for bulk sampling for column-leach test work. Previous column tests on samples of core from the Refugio and Plaza de Gallos zones returned recovery rates of 88% for gold and 63% for silver for a 143-day leach of material with 80% smaller than 6.3 mm.
With finer grinding, so that 80% of the material passed a 1.7-mm sieve, recoveries rose to 91% for gold and 76% for silver after 117 days in the column.
The latest test are part of an ongoing feasibility study at Ocampo.
At last report, Ocampo’s resources were pegged at 21.7 million tonnes grading 1.44 grams gold and 57 grams silver per tonne in the measured and indicated category (1.8 million contained ounces gold-equivalent) plus 5.8 million inferred tonnes of 1.7 grams gold and 86 grams silver (637,000 contained ounces gold-equivalent).
In November, Gammon once again renegotiated the payment schedule for Ocampo. Among other things, the new deal reduces the cash obligation from about US$17.5 million (due in two years under a previously renegotiate deal) to US$7 million. The company also has a reworked deal to acquire a 100% interest in Fuerte Mayo’s Ocampo concessions. Together, the two agreements cover virtually the entire 25-sq.-km Ocampo mining camp.
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