... 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...

..., realgar, and orpiment ( Masías, 1929 ; Lewis, 1964) . Fluid inclusion data for the veins of the west side of the district indicate temperatures of formation between 265° and 320°C, and salinities are 4 to 8 wt percent NaCl equiv ( Sawkins and Rye, 1974) . Abundant alunite occurs in an altered dacite...

... also contain smaller amounts of the sulfates alunite KAl 3 (SO 4 ) 2 (OH) 6 and jarosite KFe 3 (SO 4 ) 2 (OH) 6 . Jarosite provides a mottled brownish color to the otherwise uniform yellow sandstone. White sandstone (Munsell 10YR 8/1 to 7.5YR 8/1 white) is devoid of grain coats (Fig. 3E...

... 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...

... vein John et al., 2000                 Andesite lava flow Whole rock IH 15.86 ± 0.12 40°33’19" N 116°41’55" W Andesite of Horse Heaven John et al., 2000                 Andesite lava flow Whole rock IH 15.8 ± 0.8 40°26’08" N 116°40’18" W Lava...

... 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...

... are overprinted by epithermal mineralization, including arsenopyrite. At the central Ulaan project, ~3 km northwest of Bayan Khundii, intense quartz-white mica-pyrite alteration is widespread at surface, including tourmaline bodies and local copper anomalies, associated with nearby residual quartz and related...

... strike slip fault system and the E-W to ESE-WNW Bouillante-Capesterre normal fault zone [ Feuillet et al ., 2002 ; Calcagno et al ., 2012 ]. At the field scale, the horse-tail end of the normal E-W faults is crosscut by additional NE-SW trending faults associated to the NNW-SSE strike slip fault...

... 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...

... (Tvs) that consists of conglomerate, sandstone, mudstone, and siltstone crops out in the caldera wall east of Horse Creek. This unit filled a topographic low at least 100 m deep cut into Cretaceous granitic rock and underlies the Steens Basalt (Tsb). Conglomerate layers contain small (≤10 cm, most ≤1...

... oxidation to more effectively react with sulfide minerals, as exemplified by residual vuggy quartz, quartz-alunite-kaolinite, and white mica alteration, whereas biotite K-feld- Au (g/t) 9.26 6.0 + 250 Ag 1.62 Recovery 70 Table 1. (Cont.) Type; comments Reference First open pit mine of Carlin-type; milling...

...). Hydrothermal alteration by these fluids has produced assemblages of clays, alunite, muscovite, chlorite, pyrite, calcite, quartz, and hematite. Geochemical analyses of rocks and soils of the Roosevelt Hot Springs thermal area demonstrate that Hg, As, Mn, Cu, Sb, W, Li, Pb, Zn, Ba, and Be have been transported...

... ). Other CTDs in the Cortez area are the original Cortez mine ( Radtke et al., 1987 ), 2.5 km northwest of Cortez Hills; Horse Canyon mine, 4 km east of Cortez Hills ( Foo and Hebert, 1987 ); and the Gold Acres mine, 2.5 km west of Pipeline. The Cortez region is similar in important aspects to the Carlin...