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Mineral Resources of the Hanson Lakes Wilderness Study Area, Boise and Custer Counties, Idaho.
MISSING :114 pages
The U.S. Bureau of Mines studied the 63,985-acre Hanson Lakes study area, including the ten-mile east and part of the ten-mile west rare II areas, plus additional acreage, all proposed at times for wilderness designation. The study was part of an Idaho land assessment program with the Idaho Geological Survey and the U.S. Geological Survey, to provide minerals information for land-use decisions and ensure domestic mineral supplies. The area is at the north end of the rugged Sawtooth Range and includes parts of the Sawtooth National Recreation Area, which is closed to mineral location. The Copper Mountain, Elk Mountain, and Observation Peak mineralized areas are in the study area, but only Copper Mountain is open to claim location. It is on the trans-Challis fault zone and contains Tertiary granite that is favorable for mineral deposits of gold, beryllium, columbium, ree (rare-earth elements), tin, molybdenum, copper, silver, and lead. Identified resources are 1.9 million tons of flake graphite at Elk Mountain, but much more graphite occurs in the vicinity. Ree occurs in 18 black sand placer sites along the lower reaches of study area streams just outside the study area, on the Cape Horn Creek, Marsh Creek, and Lower Valley Creek floodplains, and at one hydrothermal site near Observation Peak. Hydrothermal ree is commonly low in byproduct thorium, a radioactive disposal problem. Many advanced ree applications enhance the quality of life, and future uses in supercondictivity may reduce energy consumption. Seventeen lode 1 geothermal, and 11 placer prospects were exami
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division