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The Mining Process. 1. Mining – open pit and underground. To define the ore from the waste rock, samples are taken and assayed. Assay results are used to mark out areas of ore and waste rock, which are mined separately. Some of the harder areas require blasting to loosen the rock prior to excavation by hydraulic diggers. Dump trucks haul …

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At its peak in the late 1800's, up to 50 small mines were feeding several local mills. A small mint was constructed in Guanaceví in 1844. However, by the early 1900's, many of the mines had closed.

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