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Ores are known which need only to be crushed coarsely to ½ in., and the whole leached. Deposits of ore amenable to coarse crushing, however, are rare. The gold must be on cleavage planes or in the cavities left by previous natural leaching of the ore in place.There are different phases of a mining project, beginning with mineral ore exploration and ending with the post-closure period. What . 188.8.131.52 Construction of access roads The construction of access roads, either to . usually used with gold, silver, and copper ores, that merits separate