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GEOLOGY

Rio Negro Province in northern Patagonia, Argentina, comprises an extensive area of relatively flat-lying terrain (Argentina) bounded in the west by the rugged Andean Cordillera (Argentina and Chile).

The Cordillera in the west occupies a relatively small area and comprises strongly folded, faulted and elevated Proterozoic metamorphic and Palaeozoic sedimentary rocks overlain by Jurassic volcanics and Jurassic-Cretaceous sediments. Cretaceous granite batholiths occur in places. Tertiary sediments and Pleistocene glacial deposits fill nearby valleys.

East of the Cordillera, the relatively low-lying Somuncura massif comprises Proterozoic basement metamorphic rocks intruded by Palaeozoic-Mesozoic plutonic intrusions.

 

The basement is overlain by a sequence of Upper Palaeozoic-Mesozoic andesite and rhyolite volcanic and sedimentary rocks that cover the central part of the province. Much of this region is capped by a thin layer of Tertiary flood basalt.

The northeastern region of Rio Negro Province is occupied by Cretaceous-Tertiary sediments of the Rio Negro valley.

Jurassic volcanic lithologies in Rio Negro Province occupy about 19,000 km2 and host prospects and showings of low or intermediate sulphidation epithermal vein style gold-silver mineralization often associated with fluorite (e.g. Los Menucos district), the main targets for exploration in this region.

Property holding
PGSA holds a number of mining properties, totaling approximately 26,000 hectares, including the Cerro El Morro property drilled during 2006.