High-temperature mineralization in veins and impregnations of a tourmaline-hornfels in the contact zone of a "micro-adamellite" intrusion (Cerro Chualla, 4,740 meters). These grade into mesothermal veins in the surrounding quartzitic sandstones.
(Avicaya and Totoral are actually two separate companies, each owning several workings in different sections of the same set of veins.)
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Map Reference: 18°30'S , 66°53'W
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