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Los Tamales is a porphyry copper-moly system 125 km southwest of Tucson, Arizona and 28 km south of the US-Mexican border. Discovered by water well sampling during a joint United States Geological Survey and Servicio Geologico Mexicano effort in the 1970's, Los Tamales was the subject of two USGS open-file reports 94-685 and 84-289.
Dense stockworks of quartz-chalcopyrite-molybdenum veinlets outcrop in a potassically altered granite in the northwest portion of the 3,851-hectare property, whereas widespread quartz-sericite-pyrite-tourmaline alteration occurs in a rhyolite porphyry to the south. Largely oxidized, this alteration area presents an additional target for an enrichment zone in the subsurface.
The target at Los Tamales is a major porphyry copper-moly system. Although the outcropping mineralization is in the 0.25% and 0.35% Cu range, Zapata Exploration believes the combination of a low strip ratio of outcropping mineralization, and the proximity to existing porphyry copper operations and supply infrastructure in Tucson will compensate for the lower grades.
The Company has conducted detailed mapping, soil geochemistry, ground IP and magnetometry, and preliminary drilling.
Five diamond drill holes tested copper and molybdenum soil geochemical anomalies in 2013 along a five-kilometer strike length with all holes showing low grade chalcopyrite and molybdenite mineralization. The deposit as currently interpreted suggests it is the deep level of a large system dissected by low angle faulting. Additional drilling is warranted to test the concept.
Los Tamales Copper Outcrop
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