Abstract

MUGAS LOBOS, Ana Cecilia; MARQUEZ-ZAVALIA, María Florencia  and  GALLISKI, Miguel Ángel. Ore minerals from Don Sixto, a low sulfidation epithermal deposit from Mendoza. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.1, pp.3-12. ISSN 0004-4822.

The Don Sixto mining project is a low sulfidation Au-Ag deposit, with a gold resource close to 900,000 ounces, located in the San Rafael Massif, in the SE of Mendoza province. Recently, it was found a precious-metal mineral association including uy-tenbogaardtite, stromeyerite, naumannite, acanthite, polybasite, stützite and cervelleite. These minerals are scarce and are commonly related to gold and silver of variable fineness, disseminated in hydrothermal quartz veins and volcanic-pyroclastic rock units from the Choiyoi and El Portillo Group. The most common mineral is pyrite associated with subordinated arsenopyrite, chalcopyrite, sphalerite, magnetite and hematite; lesser amounts of pyrrhotite, galena, marcasite, bornite, boulangerite, chalcocite, digenite and covellite were also recognized. This is the first mention in Mendoza province for uytenbogaardtite, stützite, cervelleite and polybasite.

Keywords : Selenides; Tellurides; Acanthite; Polybasite; Uytenbogaardtite.

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