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Location
The Dewey Burdock Project covers more than 11,000 acres in South Dakota on the southwest flank of the Black Hills uplift. It's part of the northern extension of the Edgemont uranium district discovered in the 1950's. Resources A form 43-101 technical report, authored by Robert Smith, has determined an inferred resource of 7.6 million pounds of U3O8 contained in 1,800,000 tons of host rock. The average grade is 0.21% U3O8. Uranium resources are contained in two deposits located at depths ranging between 400 and 800 feet below surface. Bench leach tests of cores show 99% recovery (with mild acid). Silver King Mines had previously estimated underground "mineable reserves" of approximately 5 million pounds U3O8 and calculated "identified resources" in place of 10 million pounds (estimates not compliant with NI 43-101). Permitting Underway with Knight Piesold We are well into the permitting process at Dewey Burdock. In July 2007, we contracted with Knight Piesold Consulting Engineers of Colorado to manage permitting for all required regulatory authorities including Fall River and Custer counties, the State of South Dakota, the U.S. Nuclear Regulatory Commission and the U.S. Environmental Protection Agency. The agreement with Knight Piesold covers baseline data collection, environmental impact analysis, cost/benefit analysis and permit/license applications. What's Next For 2008, Powertech will complete six core holes into mineralized portions of the Fall River and Lakota sandstones to obtain samples for metallurgical and leach testing. Test wells will also be installed to examine hydrologic characteristics and water quality of these sandstone units. At least 155 exploration holes are planned to confirm and expand previously identified historical resources throughout the project area. History Uranium was found in the Edgemont district in 1952. Early discoveries were at surface. Later drilling revealed deeper uranium deposits. In the mid 1970's, Tennessee Valley Authority (TVA) bought a major interest in the area and made Dewey Burdock their main exploration target. Silver King Mines (SKM) was hired as operator by TVA and explored the property until mid 1980's. It was then dropped due to low uranium prices. In 1981, TVA completed an a feasibility study and designed an underground mine. Projected production was 750 tons per day with total production of 5 million pounds of U3O8 (using a cutoff of 6.0 feet of 0.10% U3O8). Energy Fuels Nuclear (EFN) acquired the project in 1994 but relinquished it due to low uranium prices. Almost 4,000 exploration holes have been drilled on the property to depths of 500-800 feet. Powertech acquired the property in 2005. Regional Geology The Dewey Burdock deposit occurs in the Fall River and Lakota Formations of lower Cretaceous age. The Fall River and Lakota formations consist of permeable sandstones deposited in a major sand channel system. The sandstones are a major groundwater aquifer. The uranium occurs in the sandstones as classic roll front deposits. These deposits are amenable to ISR mining methods. Photo Gallery | | ||
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