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Location: 102 km SE from Uyuni, Bolivia
Ave. Fuerza Naval No. 500 Esq. Calle 20 de Calacoto Casilla No. 13745La PazBolivia13745
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The San Vicente Property is located 2.5 kilometres west of the prominent north-south striking San Vicente thrust fault, which forms the eastern limit of the intermountain Bolivian Altiplano basin. Mineralization at the mine site is hosted by conglomerates of Late Oligocene age. The clastic sediments are over-thrusted by a turbidite sequence of Ordovician age which outcrop on the east side of the mine. Mid-Miocene age volcanic rocks are also present on site. An important lithology in the Property area is the fanglomerates of the San Vicente Formation which are in contact with Ordovician age shales along the strike of the San Vicente fault. The fanglomerates consist of poorly sorted conglomerate with fragments of Palaeozoic sediments cross cut by younger quartz veins. The matrix is red in colour and consists of iron-bearing sandstone. Igneous activity is present in the form of pre- and post-mineralization porphyritic dacite dikes. The structural environment of the mine area consists of a series of moderately to steeply dipping pre-mineral faults striking west-northwest. The polymetallic mineralization at the San Vicente Property is present as vertically continuous fault hosted veins, replacements of brecciated faults, and mineralization in dacitic dikes. The mineralized structures are on the order of one to five metres wide, dip moderately to steeply, and trend generally towards the northwest. The San Vicente Property contains a polymetallic deposit formed by hydrothermal systems associated with repeated calc-alkaline intrusions and their extrusive products forming vein type and disseminated polymetallic deposits. Mineralization in the district is known to cover an area of three by four kilometres to a depth of 300 metres. It consists of replacement veins filling preexisting faults, replacements in brecciated conglomerates in the San Vicente fault, and mineralization in dacitic dikes. Wide veins form in the west-northwest trending structures, with widths of between two and six metres, while veins present in the northwest structures are thinner and shorter. The widest and highest grade veins form in northeast trending faults. The minerals of economic importance are sphalerite, tetrahedrite, chalcopyrite, and galena. Cassiterite, covellite, and bornite are found in some veins. The primary gangue minerals are quartz, pyrite, marcasite, and barite.
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