Hydrothermal leaching of barite, sulfides, and carbonates from lead-zinc veins in several mining districts of central Peru appears to have been associated with a late stage of silver mineralization, and was followed by deposition of sulfides and sulfosalts. It is concluded that the change from deposition to dissolution was related to a decrease in temperature in the final phases of mineralization and accompanying changes in the physicochemical equilibrium of the ore-bearing solutions.

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