Polymetallic Base Metal Veins, Río Oro Area (Cerro San Lorenzo), Santa Cruz, Argentina

Abstract

The Rio Oro occurrences are within SEGEMAR map sheet 4772-III – Lago Belgrano at a distance of about 30 kms from the village of lago Posadas. Access to the Rio Oro (Figure 1) area is easy by 2 wheel vehicle as far as the mouth of the Aroyo Aviles (Figure 2) on the north side of Rio Oro where a tent camp had been set up. All of the showings visited are located on the opposite (south side) of Rio Oro which was forded by 2 wheel drive vehicle. Water levels were abnormally low (perhaps 30 to 40 cm maximum) permitting crossing with a 2 wheel drive vehicle. All of the showings visited, with the exception of Rene and Pestizos, are located adjacent to active or former water courses where erosion has provided the exposures visited. I was asked to pass an opinion on whether the mineralization has any potential for the exploration for SEDEX deposits.