The lead-zinc ores of the Atacocha mine northeast of Cerro de Pasco, Peru, occur mainly as irregular replacement bodies and veins in Jurassic limestone and as galena-rich veins in Cretaceous sandstone. Mineralization is also found along contacts and in small fractures in Tertiary dacite which was emplaced following the main period of folding and strong faulting in the district. Much of the ore occurs near the axis of a small cross fold formed by drag along a major fault zone. The mineralogy of the ores indicates deposition at moderate to low temperatures and pressures.

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