The lead-zinc ores of the Chilete district, Cajamarca, Peru, occur in steeply dipping veins formed by fissure and breccia filling, and to some extent by replacement processes, in altered andesitic volcanic rocks which overlie Cretaceous formations with angular unconformity. Small-scale postmineral faults are widespread, but there is little evidence of movement along the veins. Zinc is more abundant than lead at depth, but the combined content of lead and zinc remains relatively constant throughout the known vertical extent of the four principal veins, suggesting that the deposits were formed during a single period of mineralization.

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