MINERALOGÍA Y GEOLOGÍA DE LA MINA MAIRA, DISTRITO EL MORADO, SAN JUAN, ARGENTINA

ANA CECILIA MUGAS ; GLADIS PALACIO BALDERRAMO

CORDOBA

Congreso; XIII CONGRESO DE MINERALOGÍA, PETROLOGÍA ÍGNEA Y METAMÓRFICA, Y METALOGÉNESIS; 2019

AGA-AMA

Mineralogy and geology of Maira mine, El Morado district, San Juan, Argentina. El Morado mining district is located at 30°59?48? S and 67°36?28? W, in the western side of La Huerta range, 55 km in NW direction from Marayes town, San Juan province. The gold quartz veins that characterize it are hosted by metamorphic rocks from the Precambrian Valle Fértil Complex. The gold quartz veins from El Morado are not isolated in this metamorphic environment; Pb-Zn-Au-Ag-Cu occurrences are widespread in the eastern side of La Huerta range. Due to their small size, most of these polymetallic deposits are not been mined, but were significant targets in 1948-1949. Though, El Morado has been discovered in 1860, only rudimentary mining has been done in the district. The quartz vein in Maira mine is grey whitish in color with light brown hue. This massive, coarse grained quartz vein is partially fractured and has infillings of calcite and goethite. The ore mineralogy, including galena, chalcopyrite, bornite and lesser amounts of pyrite and gold, mainly occurs as fracture infills.