This palm-sized pyrite specimen from the Yauricocha Mine consists of a mass of golden pyrite, with surfaces displaying an iridescent or tarnished dark patina. The Yauricocha Mine was originally developed by the Cerro de Pasco Corporation before being nationalized and later acquired by Sociedad Minera Corona in 2002. In 2011, Sierra Metals, Inc. purchased an 88% interest in the mine. The property includes Mina Central, which exploits a series of carbonate-replacement orebodies and veins, including Pozo Rico, Catas, and Cuye. The primary ore minerals at Yauricocha include galena, sphalerite, enargite, chalcopyrite, bornite, covellite, and native gold.
This specimen holds historical significance, as it was gifted to Dr. Peter Tarassoff in 1959 by then-mine engineer M. Krukar.
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