"On the results of recent exploration activities at the Huanzala ore deposits, Peru":Selection of exploration targets based on the zonal distribution of ore minerals

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The silver-lead-zinc ore deposits of the Huanzala mine, Peru, are bedded or massive orebodies replacing a limestone formation embedded in the Cretaceous sedimentary sequence. The orebodies are composed of three types of ore; pyritic ore, "Shiroji" and skarn types.<BR>Pyrite bodies are found associated with the orebodies and control the of ore types and patterns of ore element distributions. High grade orebodies are present adjacent to the pyrite bodies and consist mainly of the pyritic ore type. Ore elements show the zonal distribution; e.g. copper content and Ag/Pb ratio decrease, and Pb/Pb+Zn ratio increase towards marginal zones of the pyrite bodies.<BR>The mineralization is interpreted to be two stages; the pyritic ore and the skarn ore have formed mainly with silver-lead-zinc mineralization in the first stage and the "Shirozu ore" has deposited principally with copper mineraliza-tion in the second stage.<BR>Intrusion of quartz-porphyry is considered to be related to the mineralization and faults such as the Lower fault are passages of the ore fluid.<BR>Based on the conclusion of these studies, exceedingly positive exploration activities carried out in the El Recuerdo and the El Recuerdo-Sur section of the Huanzala mine have resulted in the highly significant discoveries of oreb'odies consisting of the.pyritic ore and the "Shiroji" ore.
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