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Highlights
- 2007 airborne EM, lake sediment geochemistry, and alpha-track surveys highlighted several anomalies
- 87 grab samples collected with an average of 0.33% U3O8 and a maximum of 2.09% U3O8 in an area over several hundred square metres
- geochemical sampling and detailed mapping will be conducted prior to further drilling
Location and History
Croteau Lake is located 18 kilometres southwest of C Zone. Noranda drilled in the Croteau Lake area in the early 1990's, but tested for base metals rather than uranium. Bedrock uranium was discovered there late in 2005 while conducting follow-up ground work on a series of airborne radiometric anomalies. The zone has been mapped on surface for at least 500 metres and the airborne geophysical signature continues for approximately 1.5 kilometres.
Geology
Mineralization in the Croteau Lake area is hosted by variably deformed iron formation at the unconformable contact between shale and slate of the Warren Creek Formation and conglomerates and sandstone of the Brown Lake Formation. Mineralized samples are enriched in U (up to 2.087% U3O8), V (up to 0.803% V2O5), Ag (up to 9.2 g/t Ag), Cu (up to 0.51% Cu), and limited Au (up to 422 ppb Au).
Previous Exploration Work
In 2005 samples collected from the Croteau Lake area returned assays averaging 0.35% U3O8 as well as significant IOCG type mineralization. Exploration work during the 2006 season produced 17 samples, which returned assays > 0.1% U3O8 to a maximum of 2.087%. The distribution of mineralized samples in combination with mapped outcrop and uranium and magnetic geophysical anomalies suggest that the mineralized horizon has a minimum strike length of 500 metres. In 2007, a small drill program consisting of 785 m in six holes was completed. In addition, a 173 site alpha-track and till geochemical survey was completed, highlighting several additional areas of uranium anomalies.
Current Exploration Work
Although limited drilling has not yet located the source of the high-grade boulders, the lake sediment, glacial till and alpha cup radon gas surveys indicate that the source is of a local nature. The Lonestar Division's 2,000 m drill program will include drilling at both Croteau Lake and Madsen Lake. Further geochemical sampling and detailed mapping will be completed prior to drilling.
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