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 polym ........

The underground mining method used at San Vicente is primarily long hole open stoping with waste backfill as well as conventional shrinkage stoping. Access to the mine for workers and equipment is provided by ramps and the Pelayo shaft while waste and ore material is brought to the surface using both haul trucks on the ramp and hoisting at the Pelayo shaft. Locomotives are used to move broken ore and waste on the levels in the conventional areas of the mine.

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