 | Henry, Christopher D., Elson, Hallet B., McIntosh, William C., Heizler, Matthew T., Castor, Stephen B. (1997) Brief duration of hydrothermal activity at Round Mountain, Nevada, determined from Ar 40 /Ar 39 geochronology. Economic Geology, 92 (7) 807-826 doi:10.2113/gsecongeo.92.7-8.807 | Journal (article/letter/editorial) | | BriefDurationof Hydrothermal Activityat RoundMountain,Nevada, Determined from4øAr/39Ar Geochronology CHRISTOPHER...• NevadaBureauof MinesandGeology, University of Nevada,Reno,Reno,Nevada89557 HALLET B. ELSON,* RoundM... NevadaBureauof MinesandGeology, University of Nevada,Reno,Reno,Nevada89557 Abstract The RoundMountaingold-silver...sanidine fromhosttuffandincremental heating of adularia indicatea mostlikelydurationof hydrothermal activityof... THE ROUNDMOUNTAIN gold-silver depositin Nye County, Nevada,hasproducedmorethan4 millionounces(Moz; 124 |  | | Report (issue) | | THE ROUND MOUNTAIN DISTRICT, NEVADA. By HENRY G. FEBGUSON. FIELD WORK AND ACKNOWLEDGMENTS. In the course...deposits of the Manhattan district the writer made short visits to Round Mountain in 1915 and 1919. He is...THE DISTRICT. The Round Mountain district is situated on the western flank of the Toquima Range, about...automobile stage from Tonopah by way of Manhattan. The range slopes gently toward the waste-filled Big Smoky...but here and there prominent hills, of which Round Mountain is the most conspicuous, rise boldly through |  | | Journal (article/letter/editorial) | | Transitionfrom Propylitic to PotassicAlteration at Round Mountain, Nevada MARK V. SANDER* AND MA•CO T. EINAUDI Departmentof...temperaturesinferred from fluid inclusions,outcrops on top of Round Mountain represent minimum depths of about 400 m below...depth rangeof at least750 m below the top of Round Mountain. More than310,000 kg (10,000,000 oz) of gold(including277...both early,pervasivepropyliticalteration(quartz-adularia-albite-chlorite-calcite-pyrite +_epidote) andlater...more fracture-controlledpotassicalteration(quartz-adularia-white mica-calcite-pyrite).Temporaltransition |  | | Report (issue) | | from the Northern Great Basin and Sierra Nevada, California, Nevada and Utah By J. L. Wooden1 , R. W. Kistler1...from the Northern Great Basin and Sierra Nevada, California, Nevada, and Utah By J. L Wooden, R. W. Kistler...coincident with the Carlin gold belt in north-central Nevada. We suggest, this isotopic boundary and the gold...locus of a cryptic major crustal fault. The Battle Mountain-Eureka or Cortez trend of gold mineralization...regions defined by initial 206Pb/204Pb for plutons in Nevada and adjoining parts of California and Utah and |  | | Journal (issue) | | Tasmania, the Heazlewood district, and the Dundas district. The Dundas Ag-Zn-Pb mining field is located about...1887. The most important period of a largescale mining for lead and silver took place there from 1890-1915...high. Gobin specimen. Crystalline gold from Round Mtn, USA Read on page 7 R. Scott WERSCHKY Editors:...Editors: Tomasz Praszkier (Poland) Scott Werschky (USA) J. Scovil photo. J. Scovil photo. INTRODUCTION Imagine...both on and off matrix! Crystalized gold from Round Mountain mine. Size 6.8 cm. Spirifer collection. Is |  | | 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 (volume) | | frcv valley-fill gravel to the east. Basin-and-range-associated tectonism during the Miocene (Stewart...conspicuous basin-and-range fault sets trend east-west, northwest, and northeast within the district. Hawkins (1982)...northwest-trending faults during the basin-and-range event. The Snow Canyon fault, one of the major east-west-trending...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 | | | 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 |
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