... to the formation of the alunite. Maps of surface mineralogy at the White Horse deposit generated from Airborne Visible/Infrared Imaging Spectrometer (AVIRIS) data were used in conjunction with X-ray diffraction studies of field samples to test the accuracy and precision of AVIRIS-based mineral mapping of altered...

... replacement bodies. The White Horse deposit, about 4 1/2 miles northeast of Marysvale, is a replacement deposit in a calcic quartz latite of the upper part of the Bullion Canyon Volcanics. This latite flow is divided into an upper vesicular and brecciated layer and a lower more massive layer which has...

... . Rockwell B.W. Cunningham C.G. Breit G.N. Rye R.O. , 2006 , Spectroscopy mapping of the White Horse alunite deposit, Marysvale volcanica field, Utah: Evidence of a magmatic component : Economic Geology , v. 101 , p. 1377 – 1395 . Rowan L.C. Schmidt R.G. Mars J.C...

..., Scotland : Journal of the Geological Society, London , v. 152 , p. 229 – 250 . Rockwell B. W. Cunningham C. G. Breit G. N. , and one other, 2006 , Spectroscope mapping of the White Horse alunite deposit, Marysvale volcanic field, Utah: Evidence of a magmatic component : Economic...

.... This study presents such integration as a means to demonstrate the utility of imaging spectroscopy for exploration in frontier areas. The first half of the paper explains how spectral measurements of alteration minerals (i.e., white mica, alunite, kaolinite, and hydrated silica) have advanced beyond...

... cemented by a matrix of quartz, alunite, and native sulfur. The Candelaria vein is considered a base metal-rich, high-sulfidation deposit, with an ore mineral assemblage similar to that of the veins of the Julcani district to the east ( Petersen et al., 1977) . The Astrohuanca and Dorita vein sets...

... Horse alunite deposit, Marysvale volcanic field, Utah: Evidence of a magmatic component : Economic Geology and the Bulletin of the Society of Economic Geologists , v. 101 p. 1377 - 1395 . Rowan , L.C. , and Mars , J.C. , 2003 , Lithologic mapping in the Mountain Pass, California area...

... edge of the Colorado Plateau. The park derives its name from the multicolored sandstone formations that range in hue from orange-red to purple, yellow, and white and that are part of the 1400-m-thick Upper Triassic and Jurassic Aztec Sandstone ( Bohannon, 1977 , 1983 ), an eolian sediment deposited...

... compositionally to mafic rocks of the Northern Nevada rift ( White and Hedenquist, 1990 ). F ig . 1. Generalized geologic map of the northern Shoshone Range, the Argenta Rim and Malpais Rim, and the southern Sheep Creek Range, showing the location of the Mule Canyon and Fire Creek deposits and the Beowawe...

... to caldera formation, indicates that the Cortez Hills and Horse Canyon Carlin-type deposits formed at ≤1 km depths. The Geological Society of America, Inc. 2008 calderas ash-flow tuff magma resurgence Basin and Range Province extensional tectonics Carlin-type gold deposit 25 08 2007...

... aluminosilicate alteration. These alteration styles indicate erosion of a lithocap to its base, exposing K-feldspar and magnetite plus quartz-white mica-pyrite related to the top of a porphyry deposit, as yet only tested by a few scout drill holes. The undated porphyry-related alteration was subsequently...

.... Verati C. , Eds, Advances in 40 Ar/ 39 Ar dating: from geochronology to thermochronology, from archaeology to planetary sciences . – Geol. Soc., London, Sp. Publ. , 378 . White N.C. Hedenquist J.W. ( 1995 ). – Epithermal gold deposits: styles, characteristics and exploration...

... Epithermal Gold Deposits: STYLES, CHARACTERISTICS AND EXPLORATION INOEL C. WHITE JEFFREY W. HEDENQUIST BHP MINERALS INTERNATIONAL EXPLORATION MINERAL RESOURCES DEPARTMENT 229 SHEPHERDS BUSH ROAD GEOLOGICAL SURVEY OF JAPAN LONDON, W6 7AN, U.K. 1-1-3 HIGASHI TSUKUBA 305, JAPAN. {Editor's note: Th4 article...

... ). These similar geochemical properties allow ammonium to be incorporated into K-minerals, including K-feldspar, leucite, mica and alunite ( Hori et al. 1986 ). Buddingtonite is a high-ammonium K-feldspar, and tobelite is a high-ammonium white mica (e.g. Erd et al. 1964 ; Higashi 1982 ). Ammonium absorbs...

... rhyolites overlie tuff of Oregon Canyon and have ages ranging from 16.49 ± 0.08 or 16.462 ± 0.018 to 16.35 ± 0.04 Ma ( Table 2 ). The only anorthoclase rhyolite lava in the western caldera wall is an undated flow (Traw) in unit Tpi along Horse Creek. Pyroclastic-fall deposits consisting of coarse...

.... Silver forms halides and native silver, which may be accompanied by metastable hypogene acanthite. Silver in jarosite, alunite, and Mn oxides is refractory. The economic advantages of near-surface oxidized deposits are that they can be mined by open pit with low costs, commonly not requiring stripping...

.... , and Hebert , J.P. , 1987 , Geology of the Horse Canyon deposit, Eureka County, Nevada , in Johnson , J.L. , ed., Bulk mineable precious metal deposits of the western United States: Guidebook for field trips : Reno, Nevada , Geological Society of Nevada , p. 326 – 332 . Foo , S.T...

.... The hydrothermal alteration assemblages associated with the present geothermal system are crudely zoned with depth. The uppermost assemblage, occurring around the hot-spring deposits and fumeroles, is characterized by quartz, alunite, kaolinite, montmorillonite, hematite, and muscovite. Parry et al (1980) have...