 | | Report (issue) | | DATA FOR GOLD-BEARING ROCKS FROM THE GOLDFIELD MINING DISTRICT, NEVADA By Roger P. Ashley and Geoffrey G...LIST OF TABLES Table 1. Geochemical data for Goldfield silicified rocks................................OF ILLUSTRATIONS Figure 1. Map of Goldfield mining district, Nevada, showing locations of analyzed gold-bearing..............3 INTRODUCTION The Goldfield mining district, Nevada, is located within a 48-km2 area underlain...(Ashley, 1974,1975). The bonanza gold ores of the district were found mainly in silicified zones in a 1.3-km2 |  | | Report (issue) | | Metals in Silicified Rocks of the Goldfield Mining District, Nevada GEOLOGICAL SURVEY PROFESSIONAL ...Metals in Silicified Rocks of the Goldfield Mining District, Nevada By R. P. ASHLEY and W. GEOLOGY ...GEOCHEI\1ISTRY OF THE GOLDFIELD MINING GEOLOGICAL SURVEY PROFESSIONAL DISTRICT, PAPER NEVADA 843-B Exploration...Exploration and geochemistry of the Goldfield mining district, Nevada UNITED STATES GOVERNMENT PRINTING...of the Goldfield Mining District, Nevada. (Geology and geochemistry of the gold mining district, Nevada) |  | | Report (issue) | | GEOCHEMICAL EXPLORATION FOR GOLD DEPOSITS AT GOLDFIELD, NEVADA By Roger P. Ashley and William J. Keith U...exploration at Goldfield Other references 7 - 8 GEOCHEMICAL EXPLORATION FOR GOLD DEPOSITS AT GOLDFIELD, NEVADA...in the 40 km hydro thermally altered area at Goldfield is to decide which of the many silicified ledges...supergene leaching. INTRODUCTION The Goldfield mining district is located 250 km northwest of Las Vegas...5 million troy ounces (46,000 kg) silver. The district includes 40 km of hydrothermally altered rocks |  | | Report (chapter) | | Survey, Federal Center MS 964, Denver, CO 80225, USA (e-mail: bberger@usgs.gov) Abstract: High-temperature...fault sets. The Virginia City and Goldfield mining districts, Nevada, were localized in zones of strike-slip...western margin of North America. The Camp Douglas mining area occurs within the same belt, but is localized...economically important precious-metal mining districts (Virginia City, Goldfield) and one economically less-important...Lower to Middle Miocene volcanic centres in western Nevada (Fig. 1). These districts provide insights into |  | Abrams, Michael J., Ashley, R.P., Rowan, L.C., Goetz, A.F.H., Kahle, A.B. (1977) Use of imaging in the 0.46-2.36 [micrometers] spectral region for alteration mapping in the Cuprite mining district, Nevada. Open-File Report Vol. 1977 (77-585) US Geological Survey doi:10.3133/ofr77585 | Report (issue) | | FOR ALTERATION MAPPING IN THE CUPRITE MINING DISTRICT, NEVADA By Michael J. Abrams Jet Propulsion Laboratory...Illustrations Page Figure 1. 2. Cuprite mining district, Nevada. A, Geologic map. £, Color ratio composite...of altered and unaltered rocks at Cuprite mining district 4 12 Table Table 1. Bandwidths of channels...FOR ALTERATION MAPPING IN THE CUPRITE MINING DISTRICT, NEVADA By Michael J. Abrams, 1 Roger P. Ashley...iron-deficient opalites in the Cuprite mining district, Nevada, have an Intense OH-absorption band near |  | | Report (issue) | | Deposits-Part I The Goldfield Gold District, Esmeralda and Nye Counties, Nevada By ROGER P. ASH LEY ...Precious-metal District, Esmeralda and Nye Counties, Nevada By ROGER P. ASH LEY The Republic Gold District, Ferry...Ferry County, Washington By MORTIMER H. STMTZ and ROBERT C. PEARSON The Comstock Lode Precious-metal District...District, Washoe and Storey Counties, Nevada By WILLIAM C. BAGBY and ROGER P. ASH LEY U.S. GEOlOGICAl...1857H 1 Gold ores-Nevada 2 Gold ores-Wash1ngton-Ferry County 3 Hydrothermal deposits-Nevada 4 Hydrothermal |  | | Report (issue) | | PHOTOGRAPHY FROM THE GOLDFIELD MINIITG DISTRICT, E3MERALDA AITD NYE COUJITIES, NEVADA T>y Roger P. Ashley...field area Ore producing areas, Gqldfield mining district Color print and overlays, Area 1 Color print...PHOTOGRAPHY FROM THE GOLDFIELD MINING DISTRICT, ESMERALDA AND NYE COUNTIES, NEVADA Site 75 5 Mission ...Geological Survey Introduction General. The Goldfield mining district is in the western part of the Basin and...Altitudes range from about 5500 to 6900 feet. The district is underlain predominantly by volcanic rocks |  | | Report (issue) | | MULTISPECTRAL IMAGES CUPRITE MINING DISTRICT, ESMERALDA COUNTY, NEVADA By R. P. Ashley and M. J. Abrams...reflectance characteristics of rocks in the Cuprite district MSDS color-ratio composite ——————————————————————————————————...Cuprite mining district, Nevada —————— 2 Hydrothermal alteration map of the Cuprite mining district, rJo^...Color aerial photograph showing the Cuprite mining district- 6 4. Graph showing average spectral reflectance...envelopes for unaltered rocks of the Cuprite mining district including basalt and 5. 6. 7. 8. 9. Spearhead |  | | Journal (article/letter/editorial) | | presentare jarosite, kaolinite, potassiummicas, pyrophyllite, montmorillonite,diaspore.and gypsum. This studyshowsthat...Laboratory Procedures Western Nevada Localities in Western Nevada was chosen for a series of Land-...J8- Locality Goldfield mining Quadrangle map name Section, township, range Goldfield Sec. 10, T....43 E. Goldfield Sec. 5, T. 3 S., R. 42 E. Goldfield Sec. 7, T. 3 S., R. 42 E. Goldfield Secs. 9...43 E. Goldfield Sec. 12, T. 3 S., R. 43 E. Goldfield Sec. 34, T. 2 S., R. 43 E. Goldfield Sec. 2 |  | | Journal (article/letter/editorial) | | SecondarySulfatesat Goldfield, Nevada Abstract The Goldfield mining district of western Nevada is at the site...underlyingpre-Tertiary plutonic and metasedimentary rocks of the district are intensely and extensively altered. Tabular...fractures. Alunite is widespreadthroughout the district in the altered areas. Primary alunite pervadesthe... 618 PRIMARY AND SECONDARY SULFATES AT GOLDFIELD, NEVADA forms sulfides,and SO2 is ultimately oxidized...hydrothermalfluid. In con- northeastof the town of Goldfield, at the intersection trast to hypogenesulfates |  | | Report (issue) | | MINERALS OF NEVADA MINERALS OF NEVADA Peer Hen By CASTOR oan eGORY.C.oFER DOCK NEVADA AND BUREAU... UNIVERSITY Reno & Las Vegas OF NEVADA PRESS GEOLOGY Nevada Bureau of Mines and Geology Special...University of Nevada Press, Reno, Nevada 89557 USA Copyright © 2004 by University of Nevada Press Photographs...otherwise noted Map of Mining Districts and significant mineral occurrences of Nevada by Nevada Bureau of Mines...Cataloging-in-Publication Data Castor, Stephen B, Minerals of Nevada / Stephen B. Castor and Gregory C. Ferdock.— Ist | | | Report (issue) | | MINERALS OF NEVADA MINERALS OF NEVADA STEPHEN B. CASTOR and G R EGOR Y C . F E R D OC K l NEVADA BUREAU...association with the UNIVERSITY OF NEVADA PRESS Reno & Las Vegas Nevada Bureau of Mines and Geology Special...University of Nevada Press, Reno, Nevada 89557 USA Copyright© 2004 by Uni versity of Nevada Press Photographs...Districts and si gnificant minernl occurrences of Nevada by Nevada Bureau of Mines and Geology All rights reserved...-Publ ication Dat,i Castor, Stephen B. Minerals of Nevada/ Stephen B. Castor and Gregory C. Ferdock.- rst |  | | Report (volume) | | east-west, northwest, and northeast within the district. Hawkins (1982) postulated that the east-west...upper- and lower-plate rocks in the Jerritt Canyon district is thought to be a high-angle fault. Exposure...cover in the district. REGIONAL STRATIGRAPHY Most of the rocks in the Jerritt Canyon district are Paleozoic...the Enfield Bell mine, Jerritt Canyon district, Elko County, Nevada. � Geology of the Enfield Bell Mine...Mine and the Jerritt Canyon District, Elko County, Nevada 97 Lower-plate rocks Lower-plate stratigraphy |  | | Report (chapter) | | form muscovite (Eqn. 1), kaolinite (Eqn. 2) (or pyrophyllite), and K-feldspar (Eqn. 3) 458 Stoffregen...assemblage alunite + muscovite + kaolinite (or pyrophyllite) + quartz in terms of total molal H2SO4 and...localities: La Tolfa, Italy; Marysvale, Utah; and Goldfield, Nevada. La Tolfa is a hot-springs deposit, in which...1983, Cunningham et al. 1984). In contrast, Goldfield, Nevada is a magmatic-hydrothermal, gold‒sulfosalt...contents (samples 3 and 4 in Table 5). Alunite from Goldfield (sample 5 in Table 5) contains up to 0.20 wt % |  | Kesler, Stephen E., Russell, N., Seaward, M., Rivera, J., McCurdy, K., Cumming, George L., Sutter, J. F. (1981) Geology and geochemistry of sulfide mineralization underlying the Pueblo Viejo gold-silver oxide deposit, Dominican Republic. Economic Geology, 76 (5) 1096-1117 doi:10.2113/gsecongeo.76.5.1096 | Journal (article/letter/editorial) | | was developed by weathering of a goldquartz-pyrophyllite deposit that formed during sedimentation in...sphalerite, and quartz; minor barite, enargite,and pyrophyllite;and tracesof electrum,argentitc, colusite, ...Viejo system is similar to other gold-quartz-pyrophyllite deposits except that it contains no known mineable...Member, on Loma la Cuaba (Fig. 1), consists of pyrophyllite-bearing rock with extensive stratiform zones...(Fig. 1). Just west of the Los Ranchos well as pyrophyllite and pumpellyite locally, Formation outcrop is |  | | Report (volume) | | Rocks, Snowstorm Mountains and Vicinity, Northern Nevada By Alan R. Wallace and E.H. McKee................Terrill Mountains Area, Holy Cross District, Churchill County, Nevada By Stephen G. Peters, Richard F....Eocene and middle Miocene volcanism in northern Nevada blanketed larger areas than has been previously...mapping by Peters and others (chapter D) in western Nevada has established a geologic and structural context...epithermal mineralization in the Holy Cross mining district. This work permits an evaluation of the mineral |  | | Report (issue) | | SURVEY GEOCHEMISTRY OF THE ALTERED AREA AT GOLDFIELD, NEVADA, INCLUDING ANOMALOUS AND BACKGROUND VALUES...---- Illustrations Page Figure 1. Map of Goldfield, Nev., and vicinity, showing areas df hydrothermal...113 Geochemistry of the altered area at Goldfield, Nevada, including anomalous and background values...sampling program carried out in the Goldfield mining district, Esmeralda and Nye Counties, Nev. Geochemical...were collected from a 15-square-mile area at Goldfield which is underlain by hydrothermally altered volcanic |  | | Journal (article/letter/editorial) | | assemblage and include the Comstock Lode, Tonopah, Goldfield, Aurora, Bodie, Paradise Peak, and Rawhide deposits...Famous districts include Comstock Lode, Tonopah, Goldfield, Aurora, and Bodie, and significant production...showed that lowsulfidation deposits in northern Nevada could be divided into two subtypes based on their...ve Ri Yellowstone Hot Spot Wyoming 0 Ma 40° Nevada S ie GREAT BASIN rra NNR Utah Ne da va California...tectonic features. Heavy line indicates the northern Nevada rift. The heavy star at the north end of the rift |  | | Journal (article/letter/editorial) | | Potosi’s coat of arms, bestowed by Charles V of Spain; Mining Journal, 1997). Cerro Rico, located next to the...proposed open-pit operation by Comibol, the national mining company of Bolivia, in 1993, but concerns about...the small miners led to the tender withdrawal (Mining Journal, 1996). There is another silver resource...part of the sacred profile of Cerro Rico; open-pit mining is not considered a problem. These deposits have... owing to insufficient technology. District Geology The district can be generalized as a shallow-level |  | Bethke, Philip M., Rye, Robert O., Stoffregen, Roger E., Vikre, Peter G. (2005) Evolution of the magmatic-hydrothermal acid-sulfate system at Summitville, Colorado: integration of geological, stable-isotope, and fluid-inclusion evidence. Chemical Geology, 215 (1) 281-315 doi:10.1016/j.chemgeo.2004.06.041 | Journal (article/letter/editorial) | | Pennsylvania 15218, U.S.A. d U.S. Geological Survey, Reno, Nevada 89557, U.S.A. b Accepted 1 June 2004 Abstract...quartz monzonite porphyry intrusion underlies the district and is cut and overlain by pyrite–quartz stockwork...the geology, mineralogy, and geochemistry of the district (Steven and Ratté, 1960; Stoffregen, 1985, 1987;...been variously referred to in the literature as Goldfield-type (Steven and Ratté, 1960; Bethke, 1984),...such as Chinkuashi, Taiwan (Huang, 1955), Goldfield, Nevada (Ashley, 1974; Vikre, 1990), Julcani, Peru |  | Rytuba, J. J., Arribas, A., Cunningham, C. G., McKee, E. H., Podwysocki, M. H., Smith, J. G., Kelly, W. C., Arribas, A. (1990) Mineralized and unmineralized calderas in Spain; Part II, evolution of the Rodalquilar caldera complex and associated gold-alunite deposits. Mineralium Deposita, 25. doi:10.1007/bf00205247 | Journal (article/letter/editorial) | | GeologicalSurvey, 345 MiddlefieldRoad, Menlo Park, CA, 94025 USA 2 Department of Geological Sciences, 1006 C.C. Little...Michigan, 48109 USA 3 U.S. GeologicalSurvey, 959 National Center, Reston Virginia, 22092 USA 4 Directorate-GeneralXII...tonnes of ore averaging 2.5 grams per ton (Skillings Mining Review 1988). The gold-alunite deposits are primarily...assemblage of quartz, alunite, kaolinite, jarosite, pyrophyllite and hematite. Along faults and fractures the...for example Summitville (Stoffregen 1987) and Goldfield (Ashley 1974), U.S.A., and Kasuga, Japan (Izawa |  | | Report (volume) | | Cuprite and Goldfield, Nevada, mining districts 4. Generalized geologic map of the Cuprite district 5. Generalized...Generalized map of the Cuprite district showing distribution of hydrothermally altered and unaltered rocks...limonitic and nonlimonitic rocks in the Cuprite and Goldfield districts 7. Thematic Mapper Simulator color-ratio...color-ratio composite of the eastern part of the Cuprite district 8. Stability ranges of mineral suites in alteration...Cuprite district 10. Thermal-Infrared Multispectral Scanner color composite of the Cuprite district showing |  | | Report (chapter) | | volcanism: a review R. H. Sillitoe Department of Mining Geology, Royal School of Mines, Imperial College...and argillic alteration, with clays, alunite, pyrophyllite, diaspore, etc., accompanied by widespread silicification;...zinc and copper. According to an analysis of the district undertaken by Geyne and co-workers, 9 the volcanic...carbonatization fringing the veins. At Tayoltita, San Dimas district (Fig. 1), volcanic rocks and an intercalated conglomerate...820 g/ton Ag and 16 g/ton Au. 10 The Guanajuato district (Fig. 1) is characterized by at least 700 m of |  | Rytuba, James J., Arribas, Antonio, Cunningham, C.G., McKee, E.H., Smith, James G., Arribas, Antonio (1989) Evolution of the Rodalquilar caldera complex and associated gold-alunite deposits, Cabo de Gata volcanic field, southeastern Spain. Open-File Report Vol. 1989 (89-326) US Geological Survey doi:10.3133/ofr89326 | Report (issue) | | CALDERA Mediterranean Sea La Isleta del Moro Mining areas Caldera margin El Pozo de I os Frailes LOS...principal geographic features, margins of calderas, and mining districts within the Cabo de Gato volcanic field...tons of ore averaging 2.5 grams per ton (Skillings Mining Review, 1988). The gold-alunite deposits are primarily...assemblage of quartz, alunite, kaolinite, jarosite, pyrophyllite and hematite. Along faults and fractures the...for example Summitville (Stoffregen, 1987) and Goldfield (Ashley, 1974), U.S.A., and Kasuga, Japan (Izawa |  | | Report (issue) | | El Salvador, Chile; Rodalquilar, Spain and Goldfield, Nevada. Supergene alunite has S^S virtually identical...steam-heated environments, such as those at the Tolfa district, Italy and Marysvale, Utah, and numerous modern...precious-metal ore deposits such as at Buckskin, Nevada. Initial 8 18OsO4 and 834S values are kinetically...by reconnaissance data on samples from several mining districts and predictions about the origin of the...Arribas, Jr., currently studying the Rodalquilar district in Spain as part his Ph. D. program, and Jeff |
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