 | | Journal (article/letter/editorial) | | the varieties aurian silver and argentian gold (electrum) to gold. Mercurian ment of Andean countries,... occurring together) from the Calumet and Hecla mine. Excepment in the oxide zones of a variety of metal...Copper Falls mine, associations and include those containing other silver minerals, Keweenaw County. barite...major Acton mine, York County, the Deer collections. One state that is draped in a silIsle mine, and the...the Sullivan mine ver-lined history is Colorado, with a pro(King and Foord 1994). Silver duction of more |  | | Journal (article/letter/editorial) | | economically importantevent, consists of quartz,electrum,silverminerals(mainly acanthite),pyrite,basemetalsulfides...Kate Peak intrusions between Cedar Hill and Mount Davidson share a common structural controlwith vein segmentsthat...faultsegments withindeclining palcothermalgradientsto the north. 0361-0128/89/982/1574-3053.00 15 74 COMSTOCK.... 1). Contactrelationsand Tertiary rocksto the north at Cedar Hill and the in- COMSTOCKLODE, FLUID-MINERALRELATIONS...mainly the Alta Formation. Some veins north of Mount Davidson occur within Kate Peak dikes. They are |  | | Report (volume) | | 'THE GEOLOGICAL vt- ,(231 > ' " ^THE MINERALS CAROLINA''" i '- OF, - :l|^fe^H - GOTEENMENT LIBRARY... W. Powell, director | | The | minerals of North Carolina | by | Frederick Augustus Geiitk | [Vignette]...J. W. Powell, director | | The | mineralsof North Carolina | by | Frederick Augustus Genth | [Vignette]...W. Powell, director | | The | :aainerals of North Carolina | by | FrederickAugustusGenth j [Vignette]...separately. Price $2.50. XVI. The Paleozoic Fishes of North America, by John Strong Newberry. 1889. 4°. 340 |  | | Journal (article/letter/editorial) | | telluride attributed to the Boly Fields mine, Lumpkin County, Georgia, was available for $800 from a...Tucson Gem and Mineral Show. The tiny Boly Fields mine closed about 1845, and, although the locality is...“the Chukotka digger cooperative alone managed to mine more than 3000 nuggets in the gold-producing season... Bill Forest (former owner of the Benitoite Gem mine), Jendon Minerals, Kristalle, Stefan Stolte, and...skeletal nugget from the Majuba placers, Pershing County, Nevada. Scott Kleine specimen, Jeff Scovil photo |  | Christie, A. B., Simpson, M. P., Brathwaite, R. L., Mauk, J. L., Simmons, S. F. (2007) Epithermal Au-Ag and Related Deposits of the Hauraki Goldfield, Coromandel Volcanic Zone, New Zealand. Economic Geology, 102 (5) 785-816 doi:10.2113/gsecongeo.102.5.785 | Journal (article/letter/editorial) | | up to 575 m at Martha and 700 m at Karangahake. Electrum and acanthite are the main ore minerals, although...(Skinner, 1986), North Island, New Zealand, contains about 50 epithermal Au-Ag deposits in a north-south–oriented...veins in 1861 in what was to become the Kapanga mine (Fig. 2, Table 1). Prospecting elsewhere in the...ended with the closure of the underground Martha mine at Waihi in 1952, although Maratoto and Tui were...gold mining began in 1988 with the Martha open-pit mine at Waihi, which to December 2006 has produced 55 |  | du Bray, Edward A., John, David A., Cousens, Brian L., Hayden, Leslie A., Vikre, Peter G. (2016) Geochemistry, petrologic evolution, and ore deposits of the Miocene Bodie Hills Volcanic Field, California and Nevada. American Mineralogist, 101 (3) 644-677 doi:10.2138/am-2016-5440 | Journal (article/letter/editorial) | | field (BHVF), astride the California-Nevada border north of Mono Lake, is one of the largest (>700 km2) and...Hills volcanic field (BHVF) in the Bodie Hills north of Mono Lake, in western Nevada and eastern California...the right-lateral motion between the Pacific and North American plates (Oldow 2003; Faulds and Henry 2008;...the Farallon plate beneath the western margin of North America and the establishment of a transform plate...9 Ma, when the Mendocino triple junction passed north of the BHVF (Atwater and Stock 1998). BHVF eruptive |  | | Journal (article/letter/editorial) | | (MarcWApril 1993). GE ON OM i I - Getchell mine, Potosi district (PO) GI - Gilbert district GO...Jarbidge district KL - Klondyke district KM - Killie mine, Spruce Mountain district IH JA - (SM) Lewis...district Majubo Hill mine, Antelope district MH MN Manhattan district MO - Moonlight mine, Disaster district... - BM - BR BU CA CC CI CL CN CO - April Fool mine, Delamar district (DE) Aspen district Austin district...Bade Mountain district Bristol mine, Jack Rabbit district Burris mine, Pyramid district (PY) Carlin district |  | | Report (issue) | | 31 University of Nevada Press, Reno, Nevada 89557 USA Copyright © 2004 by University of Nevada Press Photographs...Olivenite, 1.6-cm cluster, Majuba Hill Mine, Antelope district, Pershing County. N. Prenn collection. Photograph...Goodsprings (Yellow Pine) Mining District, Clark County John C. Kepper 91 References 467 Contributors...COLOR PLATES (following page 242) Gold, Mexican Mine Gold, Majuba Placer Pyromorphite after Galena with...with Conichalcite Gold, Round Mountain Mine Quartz, Lovelock area Acanthite Grossular, Nightingale |  | | Report (issue) | | JAMES W. WHIPPLE Gold Deposits of the Boulder County Gold District, Colorado By JAMES A. SAUNDERS Part...Ferry County. 3. Hydrothermal deposits Nevada. 4. Hydrothermal deposits Washington Ferry County. I. Geological...alteration Structure 133 Ore deposits 134 Drumlummon mine 134 Conclusions 134 References cited 136 132 Contents...Contents III Gold deposits of the Boulder County gold district, Colorado Abstract 137 Introduction...fourth level, Drumlummon mine 135 Map of Colorado showing location of Boulder County gold district and other |  | | Journal (article/letter/editorial) | | Paao ama, Clark County. Walt Lombard0 specimen, Jeff Scovil photo. Churchill County Chalk Mountain District...District Chalk Mountain mine: calcite, cerussite, chlorargyrite, descloizite, galena, hemimorphite, leadhillite...Quartz, 14.2 cm across, Newbeny Mountains,Clark County. Steve Scott specimen, Jeff Scovil photo. Figure...Clinotyrolite spray, 3.4 mm across, Lovelock mine, Churchill County. Figure 2 (bottom). Wulfenite, 1.1 mm high...high, Chalk Mountain, Churchill County. Dan Behnke specimens and photos. Hot Springs Iron meteorite |  | | Journal (article/letter/editorial) | | onisrestrictedto fracturesstrikingeast-west to north-northeast. Regionalnormalfaults trendingnorth-northwest...bonanza-type preciousmetal vein deposits.The Tayoltita mine has produced107kg Ag and 2 X 105kg Au and thusr...reopened The townof Tayoltita(Fig. 1), for whichthe mine many of the old Spanishworkingsduring the 1880s...includingthe Arana, Cinco Sefiores,San Luis, and county seat for the Municipio de San Dimas. It is Candelariamineswhich...bottom of the Grand Canyon-like as the Tayoltita mine. Other mines in the district, chasm,or barranca |  | | Report (edition) | | Information Circular GOLD RESOURCES OF NORTH CAROLINA by P. A. Carpenter, D oc ms C% M:*L Raleigh...for the general welfare of the citizens of North Carolina. The section conducts a number of basic and...Geological Survey Section, P.O. Box 27687, Raleigh, North Carolina 26711. Jeffrey C. Reid Chief Geologist Cover...3 Mining Methods and Recovery 3 Gold in North Carolina 5 History of Mining 5 Production 7 General...Deposits of North Carolina 12 Eastern Carolina Belt 12 Portis Mine 14 Other Mines 14 Carolina Slate |  | Castor, S. B., Boden, D. R., Henry, C. D., Cline, J. S., Hofstra, A. H., McIntosh, W. C., Tosdal, R. M., Wooden, J. P. (2003) The Tuscarora Au-Ag District: Eocene Volcanic-Hosted EpithermalDeposits in the Carlin Gold Region, Nevada. Economic Geology, 98 (2) 339-366 doi:10.2113/gsecongeo.98.2.339 | Journal (article/letter/editorial) | | 1876–1895 1898–1903 1903–1941 Silver zone Dexter mine Various 150,0001 40,000 18,000 7,000,000 100,000...1979–1981 1987–1990 Total Leaching of dumps Dexter mine 2,000 34,000 204,000 147,000 185,000 7,632,000...Theodore, 2000), base metaland Ag-bearing skarn at Ward (Hasler et al., 1991), Au skarn at McCoy (Brooks...wedge of Ordovician and Silurian rocks immediately north of the Tuscarora district, consists of quartzite...characteristics of a caldera. The basin is truncated on the north by the younger Big Cottonwood Canyon caldera; its |  | | Journal (article/letter/editorial) | | CO 80401, USA; tmonecke@mines.edu FLUID INC., 1401 Wewatta St. #PH3, Denver, CO 80202, USA; fluidinc@comcast...quartz. The colloform bands contain dendrites of electrum and naumannite that must have grown in a yielding...geothermal field is located 8 km north of Taupo in the Taupo Volcanic Zone of North Island, New Zealand (Figure...Wairakei geothermal field in New Zealand. (a) Map of North Island, New Zealand. The Figure 1. Wairakei geothermal...geothermal field in New Zealand. (a) Map of North Island, New Zealand. locations of the Taupo Volcanic |  | | Journal (article/letter/editorial) | | (primarily pyrite and arsenopyrite), and as visible electrum grains hosted in pyrite. Up to approximately 1000...ore formation and Au mineralisation. At Fairview mine, three stages of pyrite formation were identified...last of which is associated with arsenopyrite, electrum and other sulfide minerals (sphalerite, chalcopyrite...and Sb-sulfides). At Sheba mine, pyrite was deposited in two stages, and electrum is associated with the...and is present both as “invisible” gold and as electrum inclusions (Cabri et al., 1989). In this study |  | | Report (issue) | | IN NORTH CAROLINA INFORMATION CIRCULAR 29 DEPARTMENT OF ENVIRONMENT, HEALTH AND NATURAL RESOURCES ...agencies for the general welfare of the dtizens of North Carolina. The Section conducts basic and applied research...Resources, at Post Office Box 27687, Raleigh, North Carolina 27611-7687, or call (919) 733-2423. Jeffrey...Chief Geologist GOLD NORTH CAROLINA IN . by P. Albert Carpenter III NORTH CAROLINA GEOLOGICAL SURVEY INFORMATION...INFORMATION CIRCULAR 29 STATE OF NORTH CAROLINA James B. Hunt, Jr., Governor DEPARTMENT OF ENVIRONMENT |  | | Journal (article/letter/editorial) | | oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating—Edwin...the Yilgarn Craton, Western Australia —P. Sorjonen-Ward, Y. Zhang, and C. Zhao 935 Compilation of U-Pb zircon...C. Broadbent, M. Brown, G. Willetts, P. Sorjonen-Ward, J.L. Walshe, and C. Zhao 1011 Geodynamics and metallogeny...Trapping and mobilization of arsenic and lead in former mine tailings. Environmental conditions effects—A. Courtin-Nomade...dissolution of pyritic sludge from the Aznalcóllar mine (SW Spain)—C. Domènech, J. de Pablo, and C. Ayora |  | | Journal (article/letter/editorial) | | the LowlandCreekVolcanics of middleEoceneage.A north-northeast-striking swarmof quartzlatiteporphyrydikeswas...mineral dikes in the diatreme. Gold occursin electrum, withafineness ofabout550,asinclusions oflessthan200•m...usingstandardflotationand cyanidationpractices.An open-pit mine and mill complex,with a rated capacityof 15,000...pendant,some9 by 8.5 km in surfacearea, in the north-centralpart of the Boulder batholith (Fig. 1). The... The roof pendantis uncomformably overlainby a north-northeast-trending belt of volcanicrocks(Fig. 1) |  | | Journal (article/letter/editorial) | | epithermal Au-Ag deposits in a 200-km-long by 40-km-wide north-south−trending belt. These deposits have produced...the Hauraki goldfield ranges from 16.3 Ma in the north to 2 Ma in the south, and clusters into two distinct...Regional Geology ge In the last 25 m.y., the North Island of New Zealand has undergone a considerable...considerable shift in the locus of volcanism, from the north- to northwest-trending Northland arc between 25 and...significant clockwise rotation of the arc from north-northwest to northeast trending. Rid dec ma Ha |  | | Journal (article/letter/editorial) | | Recovery History of the Olinghouse District, Washoe County, Nevada Scott Kleine [2:20 to 2:40] The Gold Tellurides...Raines [2:40 to 3:00] The Round Mountain Gold Mine, Nye County, Nevada R. Scott Werschky LUNCH BREAK the...Ontario, as well as such unlikely places as South Carolina and Papua New Guinea. Although not all of these... with papers representing African, Australian, North American and European gold occurrences. Each will...California localities such as the Colorado Quartz mine near Mariposa. The Systematic Study of Regolith |  | | Report (volume) | | State Museum, Albany. North Carolina.. .Dr. Joseph Hyde Pratt, Chapel Hill. North Dakota... .Dr. A. G...... .Prof. Charles W. Brown, Providence. South Carolina.. .Dr. Earle Sloan, Charleston. South Dakota....See Bauxite and Hallpysite. Asbestos. Tallapoosa County, with corundum deposits near Dudleyville; not found...commercial quantity or quality. Asphalt. Colbert County, small quantity has been shipped from near Leighton;...following localities: Bibb County, Pratts Ferry; Calhoun County, near Tampa; Clay County, T. 20, Pv. 7 E.; Jefferson |  | | Journal (article/letter/editorial) | | fromsulfidesandlocallyconcentrating it in a recoverableform(electrum). Introduction (e.g.,Marquiset al., 1990). The...]Complex • r•ol•e • ........... MOaRUN , FIG. 1. Mine geologyof the Mobrundeposit,modifiedafter Caumartinand...synclinorium. The Blake River synclinoriumis boundedon the north by the Porcupine-Destor break and on the southby...kilometers of these structures. The Mine Geology The Mobrun mine is located 30 km northeast of lower...Mineral Inventories and Ore Reserves of the Mobrun Mine Source Metric tons Cu (%) Zn (%) Ag (g/t) |  | 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) | | carbonaceous sediments and diminish in abundance down- ward into the coarser clastic units. The veins contain...barite, enargite,and pyrophyllite;and tracesof electrum,argentitc, colusite, tetrahedrite-tennantite,...averages 1:7, decreases slightly with depth. Au is in electrum in the lower part of the mineralized zone and...from massive to agglomeratic, is thickest to the north and west of the area and is thin or absent below...deuteric alteration. Geology of the Pueblo Viejo Mine Area brana Member consists of agglomerate, conglomerate |  | | Report (volume) | | ......... North Carolina. .......................................................... North Dakota............................................. South Carolina......................................:..........1888. Branner, J. C., The zinc and lead region of north Arkansas: Arkansas Geol. Survey Ann. Kept, for 1892...Fair edition, 1904. Genth, F. A., Minerals of North Carolina: U. S. Geol. Survey Bull. 74, 1891. Shannon...Catalogue of the mineral localities of South Carolina: South Carolina Geol. Survey, ser. 4, Bull. 2, 1908. Scott | | | Report (issue) | | 3i University of Nevada Press, Reno, Nevada 89557 USA Copyright© 2004 by Uni versity of Nevada Press Photographs...te, r.6-cm cluster, Majuba Hill Mine, Antelope district, Pershing County. N. Prenn coJlection. Photograph...Goodsprings (Yellow Pine) Mining District, Clark County John C. Kepper MINERAL CATALOG 91 121 Gregory...Hen1in1orphite Azurile Barite, N1eikJe Mine Barite, '\forthun1berland Mine Bante, Rosebud t1ine Barile v;ith...inclusions Bolt½'OOdite Calcite, Meikle Mine Calcite, Getchell Mine Callaghanite Cassiterite and Hema tile |
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