[en] The initial survey of Argentine uranium resources was completed in 1959. This survey, conducted over a 12-year period, covered approximately 1,000,000 square kilometres. The exploration programme used a combination of airborne, carborne, and hand-held radiometric surveys, together with supporting geochemical and emanometric evaluations. Nearly 1000 anomalies were found, and of these 500 were selected for further study. This work included detailed geological, radiometric and emanometric surveys, as well as 230,000 metres of drilling and 35,000 metres of trenching and tunnelling. As a result 200 of the anomalies were reclassified as deposits of four different size categories. Eighty of the deposits were estimated to contain 10 tonnes U₃O₈, 15 were placed in the 100 tonnes U₃O₈ category, 7 were designated as 1000 tonnes deposits, and one was estimated to contain approximately 16,000 tonnes of U₃O₈. The uranium resources of Argentina are presently estimated to be 31,000 tonnes U₃O₈, based on a cost of up to US $80 per kilogram U₃O₈. An additional 12,000 tonnes U₃O₈ are available if a US $80-130 per kilogram U₃O₈ cost category is used. The overall uraniferous geological potential based on favourability criteria is estimated to be around 400,000 tonnes U₃O₈. (author)