The Revett Formation of northern Idaho and western Montana contains major stratabound copper-silver deposits near Troy, Rock Creek, and Rock Lake, Montana. To help the U.S. Forest Service (USFS) meet its goal of integrating geoscience information into the land-planning process, U.S. Geological Survey (USGS) scientists recently completed a compilation of regional stratigraphy and mineralogy of the Revett Formation and a mineral resource assessment of Revett-type copper-silver deposits. The USGS assessment indicates that a large area of USFS-administered land in northwestern Montana and northern Idaho may contain significant undiscovered Revett-type copper-silver deposits.
U.S. Geological Survey scientists recently completed an assessment of copper-silver deposits in the Revett Formation in northwestern Montana and northern Idaho. This photograph shows an outcrop of Revett Formation quartzite beds in the Coeur d’Alene Mining District of northern Idaho. (USGS photograph by Jeffrey Mauk.)
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