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On the basis of mineral-resource surveys the western part of the Tuolumne River Roadless Area, California has a substantiated potential for the occurrence of gold and silver resources and has numerous mines and prospects with demonstrated or inferred gold resources. The gold is localized in high-grade shoots within quartz veins in the Calaveras Complex of metasedimentary rocks and as placer gold in Tertiary and recent river beds. The Tuolumne River bed has a probable placer gold resource potential. Limestone and dolomite deposits occur within the roadless area, and similar deposits are found outside the area. There is little promise for the occurrence of energy resources in the roadless area.
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TUOLUMNE RIVER ROADLESS AREA, CALIFORNIA.
Geological Survey Professional Paper (United States)