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The Ishi, Mill Creek, Polk Springs, and Butt Mountain Roadless Areas occupy approximately 50 sq mi in an area about 25 mi north of Chico, California, and 25 mi south of Mount Lassen. Mineral surveys indicated little promise for the occurrence of mineral resources in much of the areas. Portions of Deer and Mill Creeks are considered to have probable resource potential for small amounts of gold. The geologic setting precludes the occurrence of energy resources and no other metallic mineral resources were identified.
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ISHI, MILL CREEK, POLK SPRINGS, AND BUTT MOUNTAIN ROADLESS AREAS, CALIFORNIA.
Geological Survey Professional Paper (United States)