Canadian Mining Journal


GOLD: Met tests could cut capex and opex for Marathon’s Valentine Lake project

NEWFOUNDLAND – The results of bottle roll cyanide leach tests done on mineralized material from Marathon Gold Corp.’s Valentine Lake project 55 km south of Buchans are encouraging. Thibault & Associates carried out the tests for the Toronto-based company.

Gold extraction was 73.6% from –6 mm crushed samples after 96 hours of treatment. Half the gold extraction occurred in the first 22 hours of leaching. Both samples from the Leprechaun and Marathon deposits were tested and found to have similar leachability characteristics.

“The bottle roll tests are an excellent start to our metallurgical test program. Heap leaching with its lower capital and operating costs could be a dramatic change for the project. Heap leaching could also reduce the pit cut-off grade resulting in a lower waste to ore ratio and better pit economics. It could also give us options in processing such as run of mine heap leaching low grade ore and using a smaller mill to treat higher grade ore for optimized project economics,” said Phillip Walford, president of Marathon.

Four short column tests are now underway to test recovery using a larger sized particles.

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