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Located in the Nukay mining district of central Guerrero State, Mexico, the Los Filos gold mining project is one of the largest opencast mines in the country. Los Filos is a heap leach operation. The ore size is reduced at the crushing plant and then hauled to the valley where it is stacked on engineered pads. The ore is sprayed with a chemical solution that extracts and absorbs the gold as it trickles through the ore. To regulate seepage rate, an agglomerate (cement) is mixed into the ore to optimise ore exposure to the leaching solution. Ultimately, the solution is directed to the plant where the gold is precipitated out.

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