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September 2006, PDF | ![]() Located in Mendoza Province, the Huemul Project consists of 20,673 hectares of claims and leases which includes the past underground uranium producing mines of Huemul, Arroyo Seco, and Agua Botada. Historic recovered grades were about 0.21% U3O8, 2% Cu and 0.11% V. All of the known uranium mineralization is contained within paleo-channel deposits in continental redbed sandstones of the Cretaceous-age Diamante Group (see light green at Regional Geology Map), and all mineralization is associated with a combination of bitumen and carbonaceous material reductant. The three mines produced from at least four paleo-channels down-dip for around 200 metres. The uranium mineralization is accompanied by ore-grade values of copper, silver and vanadium. The uranium mineralized channels at Huemul are unusually robust - for example, Agua Botada was mined over a 500 metre width, which apparently is two individual channels each about 200 metres wide.
The underground mining works include 7,000m of galleries and shafts. Historical reports mention 30% mining dilution. Metallurgical recovery is unknown. Therefore, "in situ" grades should be higher than the 0.21% U3O8 historical grade reported. Surface sampling over mineralized outcrops yields as high as 3.4% U over 20 cm thicknesses. The past mining works were focused on the most economic or accessible mineralized beds within the middle section of the Diamante Group. However, mineralized beds are recognized also at the bottom of the sedimentary sequence. Small mining prospects may be observed related to this section. The continuity of these lower mineralized beds below Huemul-Agua Botada is unknown (see Regional Geology Cross-Section). Seismic surveys depict a series of stacked thrust faults which repeat the Huemul mineralized horizon several times. The possible feeder structure for these stacked beds is also indicated toward the west. The airborne radiometric survey over the project discloses many uranium anomalies; totalling 48 anomalies (see Airbone Radiometric Map). Although some anomalies are related to the abandoned mines, other important anomalies represent newly recognized uranium mineralization. Based on the airbone radiometric anomalies, a new area named Vega Larga was discovered to the south. The intensity of the alteration and the presence of U + Cu ±Ag geochemical anomalies, suggests potential for discovery of another mineralized zone similar to the original Huemul mine.
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