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Location: 48 km NE from Tacuarembo, Uruguay
Echevarriarza 3535, Of. 1512MontevideoUruguay11300
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The deposits discovered by Orosur to date in the San Gregorio project area are considered to be typical of mesothermal vein-style, or orogenic-style gold deposits.The deposits located along the east-west to northwest trending SGFS are, from west to east, the Santa Teresa deposits, the Polvorín deposit, the Ombú deposit, the San Gregorio deposit and the Arenal deposit. Zapucay and Argentinita deposits lie along the extension of the one fold and thrust fault system to the east, with similar age of SGFS.Gold mineralization at SGGP has occurred as infill of brittle fractures within favourable host rocks such as zones of silicification and mafic units. Brittle fracture has occurred within these zones in response to local extensional tectonics created by the intersection of different trending faults, faults with dikes and changes in the attitude of the fault itself. Intense brittle fracture, silicification and quartz veining are apparent in higher grade zones. At least 3 phases of fracturing and veining can be recognised from drill core. The gold deposits are generally hosted within basement granulite and amphibolite facies within the upper plate of a large thrust fault that defines the contact with the younger granites to the north. Pyrite is the dominant sulphide, and gold grade is directly proportional to the pyrite content. The gold at all deposits is fine, and visible gold is rare. Other potentially deleterious elements are in low concentrations. The northeast trend to the mineralization is apparent within the granites to the north of the main thrust, where the Sobresaliente and Castrillón deposits are located. These deposits are approximately 5 km and 7 km north of the San Gregorio mine site respectively.
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