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S. J. Sutley

Publications and source records attributed to S. J. Sutley.

At least 73 records · Page 4Linked to original sources
USGS1985

Near-infrared spectra of West Shasta gossans compared with true and false gossans from Australia and Saudi Arabia

The near-infrared spectra of a suite of outcrop samples of massive sulfide gossans and false gossans representing three different weathering environments were measured and studied with X-ray, scanning electron microscope, and energy dispersive X-ray. Gossans that formed in a humid tropical environment are represented by samples from the Mt. Isa area, Queensland, Australia, and gossans that formed in an arid environment are represented by samples from several locations in Saudi Arabia. The gossans of the West Shasta massive sulfide district in California represent a weathering environment intermediate between these two extremes.On the basis of these spectral measurements, true gossans after massive sulfide deposits have spectra in the 800 to 2,500 nanometer (nm) region that are distinctly different from the spectra of false gossans. In the humid tropical environment, highly leached, newly formed kaolin minerals in the gossan cause spectral differences at about 1,400 to 2,200 nm. In the arid environment, true gossans preserve talc and minor mica from the massive sulfide deposit; these minerals are not observed in false gossans. These minerals result in spectral differences in the 2,200- to 2,300-nm region. In addition, true gossans generally have goethite spectral bands at about 900 nm as opposed to hematite spectral bands at about 850 nm for the false gossans.False gossans are not known in the West Shasta district; however, the gossan at the largest deposit, Iron Mountain, is a true gossan that has the distinctive spectral features of goethite at about 900 nm and diaspore in the 1,400- to 2,500-nm region. The other gossans also have the spectral features of goethite, but they contain a less leached mixture of kaolinite plus illite and have distinctive spectral features in the 1,400- to 2,500-nm region. These spectral differences define two groups of West Shasta gossans--inner gossans in large deposits and outer gossans at the margins of large deposits and in lesser massive sulfide deposits.

Economic Geology↗
USGS1985

Map showing the distribution of selected mineral assemblages in nonmagnetic heavy-mineral concentrates from stream sediments from the Vasquez Peak Wilderness Study Area, and the Williams Fork and St. Louis Peak Roadless Areas, Clear Creek, Grand, and Summit counties, Colorado

The U.S. Geological Survey and the U.S. Bureau of Mines conducted field studies from 1979 through 1983 to assess the mineral resource potential of the Vasquez Peak Wilderness Study Area (acreage: 16,000), the Williams Fork Roadless Area (acreage: 74,820), and the St. Louis Peak Roadless Area (acreage: 12,800). Included were geological, geochemical, and geophysical studies by the U.S. Geological Survey and investigation of known prospects and mines by the U.S. Bureau of Mines.

Colorado↗
USGS1984

Summary geochemical maps, Hoover Wilderness and adjacent study area, Mono and Tuolumne counties, California

The Hoover Wilderness and the adjacent Hoover Extension (East), Hoover Extension (West), and Cherry Creek A Roadless Areas (the adjacent study area) encompass approximately 153,900 acres (241 mi 2 ; 623 km 2 ) in the Inyo, Stanislaus, and Toiyabe Naitonal Forests, Mono and Tuolumne Counties, Calif. These two areas lie along and mostly east of the crest of the Sierra Nevada, along the north and east sides of Yosemite National Park. Elevations vary from a high of 12,446 ft (3,793 m) on the crest of the Sierra Nevada to a low of about 6,500 ft (1,981 m) near the Bridgeport Ranger Station. Access to the Hoover Wilderness and adjacent study area is by U.S. Highway 395, California State Highways 108 (Sonora Pass) and 120 (Tioga Pass), and by other paved and graded roads that lead off of these U.S. and State highways.

California↗