 | | Report (issue) | | deposits in the Piedmont 129 9. Mineral district, Virginia 133 10. Description of the ore bodies 134... 137 Results of sulfur isotope studies 145 Virginia gold-pyrite belt 170 Carolina slate belt polymetallic...236 Lead in Kings Mountain belt and Inner Piedmont K-feldspars 244 Lead in the Kings Mountain belt and...Lead in sulfide deposits 312 Lead in igneous feldspar 316 A model for the pattern of lead isotopes...galena lead isotope ratios. 21. 123 Blue Ridge K-feldspar and galena data on lead isotope ratio diagrams |  | | Journal (article/letter/editorial) | | in northwestern Nevada and southeastern Oregon, USA Stephen B. Castor ) , Christopher D. Henry NeÕada...School of Mines, Mail Stop 178, Reno, NV 89557, USA Received 14 June 1999; accepted 24 September 1999...about 224,000 kg U3 O 8 in the 1960s ŽTable 1; Walker, 1980.. Production from other districts has been...prospects in volcanic rocks, Nevada and Oregon, USA Production and grade: % U3 O 8 Resource: kg U3 O... Sb, W McDermitt caldera Kings RiÕer Moonlight Mine none none Bretz – Opalite Aurora none 7.5=10 |  | | Report (volume) | | the west half of the quadrangle lies within the Walker Lane Belt, a northwest-trending structural zone...prospects by deposit type (John and Sherlock, I99I), K-Ar and Rb-Sr geochronology, geochemical sampling of...California. Also shown is approximate outline of the Walker Lane Belt structural and physiographic zone (diagonal...Mountains, the Dead Camel Mountains, parts of the Virginia Range, the Terrill Mountains, the Blow Sand Mountains...Mines and Geology subsequent to publication of county reports for these areas (Moore, 1969; Bonham, 1969) |  | | Journal (article/letter/editorial) | | reviews are placed at the end. ABUMERE,O. E., see WALKER,G., 201 Actinolite, flexibility in asbestiform...TEM, 311 AI, Y., and GREEN, D. n., anorthite-K-feldspar system, 337 Albite, AI/Si ordering in, 25 ALDERTON...505 Amphibole, ferri-ferrohornblende, kirwanite, County Down, Northern Ireland, 253; fibres, flexibility...of, by M6ssbauer spectroscopy, 465 Anorthite-K-feldspar, phase relations in, and solid solutions, 337...and WILLIAMS,P. A., lanthanite group, Sweden and USA, 639 Auger electron spectroscopy (AES), arsenopyrite |  | Day, Warren C., Slack, John F., Ayuso, Robert A., Seeger, Cheryl M. (2016) Regional Geologic and Petrologic Framework for Iron Oxide ± Apatite ± Rare Earth Element and Iron Oxide Copper-Gold Deposits of the Mesoproterozoic St. Francois Mountains Terrane, Southeast Missouri, USA. Economic Geology, 111 (8) 1825-1858 doi:10.2113/econgeo.111.8.1825 | Journal (article/letter/editorial) | | Francois Mountains Terrane, Southeast Missouri, USA Warren C. Day,1,† John F. Slack,2 Robert A. Ayuso...Survey, National Center, Mail Stop 954, Reston, Virginia 20192 Department of Natural Resources, Missouri...Francois Mountains terrane of southeast Missouri, USA. The St. Francois Mountains terrane lies along the...et al., 1996; Lowell, 2000; Menuge et al., 2002; Walker et al., 2002; Lund et al., 2015). The older † Corresponding...andesite (Kisvarsanyi et al., 1981; Day et al., 1992; Walker et al., 2002). The volcanic rocks were intruded |  | | Journal (article/letter/editorial) | | Weathering of the New Albany Shale, Kentucky, USA: I. Weathering zones defined by mineralogy and major-element...cation exchange. Altered primary minerals include K-feldspars, plagioclase, calcite, pyrite, and chlorite...where complete pyrite oxidation and alteration of feldspar and organic matter result in increased permeability...underlie thousands of km2 of the eastern and central USA. The shale was deposited very slowly in relatively...rates for the Appalachian Plateau in nearby West Virginia are 7– 10 m/Ma, with rates of 4–11 m/Ma on hilltops |  | Ayuso, Robert A., Slack, John F., Day, Warren C., McCafferty, Anne E. (2016) Geochemistry, Nd-Pb Isotopes, and Pb-Pb Ages of the Mesoproterozoic Pea Ridge Iron Oxide-Apatite–Rare Earth Element Deposit, Southeast Missouri. Economic Geology, 111 (8) 1935-1962 doi:10.2113/econgeo.111.8.1935 | Journal (article/letter/editorial) | | Survey, Mail Stop 954, National Center, Reston, Virginia 20192 2 U.S. Geological Survey, Mail Stop 973...et al., 1996; Lowell, 2000; Menuge et al., 2002; Walker et al., 2002; Thomas et al., 2012; Lund et al....occur locally (Kisvarsanyi, 1981; Day et al., 1992; Walker et al., 2002; Day et al., 2016). Nearly all of...Bourbon Pea Ridge Pea Ridge pluton Caldera boundary Mine, prospect or occurrence 38o 00’ Potosi pluton...to the presence of abundant monazite and minor K-feldspar. In total, these four pipes contain an estimated |  | | Journal (article/letter/editorial) | | of magma generation. The bimodal assemblage is a K-rich tholeiitic series formed during continental rifting...assemblage. The western andesite assemblage is a high K calc-alkaline series that formed a continental-margin...western andesite assemblage was erupted in the Walker Lane belt, a zone of transtension and strike-slip...Arizona F 20 Ma 32° Mendocino Fracture Zone Walker Lane Belt "Western Cascades" Arc (21 Ma) FIG...(SAF). Modified from Zoback et al. (1994, fig. 1). Walker Lane belt from Stewart (1988). NNR = northern Nevada |  | Graupner, T., Melcher, F., Gäbler, H.-E., Sitnikova, M., Brätz, H., Bahr, A. (2010) Rare earth element geochemistry of columbite-group minerals: LA-ICP-MS data. Mineralogical Magazine, 74 (4) 691-713 doi:10.1180/minmag.2010.074.4.691 | Journal (article/letter/editorial) | | tantalum ore concentrates (e.g. as a forensic tool). K EY WORDS : LCT family pegmatites, columbite-tantalite...phosphates in such systems is well documented (e.g. Walker et al., 1986; Kontak, 2003, 2006; Larsen, 2002;...(lithium-caesium-tantalum) family are rarely reported (e.g. Walker et al., 1986; Aurisicchio et al., 2001; Nakajima...Western Australia, Australia Volta Grande (Mibra mine), Nazareno, Minas Gerais, Brazil Sao Joao del Rei...tantalite-(Mn) G 14, Nkumua mine, Kanzambi, Shabunda, Kivu, DRC Bionga mine, Shabunda, Kivu, DRC Tanco |  | | Journal (article/letter/editorial) | | University of Texas at Austin, Austin, TX 78713, USA a r t i c l e i n f o a b s t r a c t Article...potassium feldspar during deep burial. Volume of this late dissolution of potassium feldspar is offset...Nacogdoches Sabine Trinity Jasper Madison Polk Brazos Walker Grimes Burleson Lee Fayette Hardin Washington...but the farthest downdip samples, from Brazoria County (Fig. 1), were deposited in a slope-fan complex...sandstones in the updip part of the study area (Leon County; see Fig. 1) were uplifted in the Oligocene and |  | Sánchez-Muñoz, Luis, Müller, Axel, Andrés, Sol López, Martin, Robert F., Modreski, Peter J., de Moura, Odulio J.M. (2017) The P–Fe diagram for K-feldspars: A preliminary approach in the discrimination of pegmatites. Lithos, 272. 116-127 doi:10.1016/j.lithos.2016.10.030 | Journal (article/letter/editorial) | | The P-Fe diagram for K-feldspars: A preliminary approach in the discrimination of pegmatites...pertain. ACCEPTED MANUSCRIPT The P-Fe diagram for K-feldspars: a preliminary approach in the discrimination...Geological Survey, Federal Center Denver, CO 80225-0046, USA. AC CE P ABSTRACT Governador Valadares, Minas...use the mineralogical and chemical attributes of K-rich feldspars, the only mineral that is omnipresent...have selected specimens of blocky perthitic K-rich feldspar from the inner part of thirty-one pegmatites |  | | Report (issue) | | Idaho Mining and Exploration, 2016-2017 Virginia S. Gillerman Earl H. Bennett Alexis Clark Mark Barton...83844-3014 Idaho Mining and Exploration, 2016-2017 Virginia S. Gillerman Earl H. Bennett Alexis Clark Mark...vein, 4900 level, Galena mine ……………...………..……8 Figure 5. Golden Chest mine, Murray, overview……. ……………………...Canyon mine, 2017………….……………..….....11 Figure 8. Reclamation at Panel A, North Rasmussen Ridge mine, 2017………………...exploration projects……………………….22 Figure 15. Bunker Hill mine glory hole., 1907………………………………………….23 Figure 16. |  | Kesler, Stephen E., Martini, Anna M., Appold, Martin S., Walter, Lynn M., huston, Ted J., furman, Francis C. (1996) Na-Cl-Br systematics of fluid inclusions from Mississippi Valley-type deposits, Appalachian Basin: Constraints on solute origin and migration paths. Geochimica et Cosmochimica Acta, 60 (2) 225-233 doi:10.1016/0016-7037(95)00390-8 | Journal (article/letter/editorial) | | Prkd Pergamon 0 1996 Elsevier Science Ltd in the USA. All rights reserved 0016.7037/96 $15.00 + .IXI...48109, USA ‘Dept. of Geology and Geophysics, University of Missouri at Rolla, Rolla, MO 65401, USA (Received...Marion and Russell-Tazewell districts in southern Virginia, which form the northern limit of the East Tennessee...several deposits including the Daniel’s Harbour mine (Lane, 1990). Smaller amounts of MVT mineralization...with other evaporite minerals and reaction with feldspar-bearing rocks, but most brines plot on or near |  | | Report (issue) | | Basin (Fe) in Churchill County; Buckskin (Fe, Cu, Au, Ag) in Douglas County; Como (Ag, Au, Cu) and Yerington...Yerington (Cu, Ag, Au) In Lyon County; Broken Hills (Ag, Pb, Cu, Au, Zn), Nevada Scheelite (W, Pb, Ag...Au, Pb, Cu) in Mineral County; Quartz Mountain (Ag, Pb, Au, W) in Nye County; Ragged Top (W) and Nightingale...Nightingale (W) in Pershing County; Gooseberry (Ag, Au) in Storey County; and Galena (Zn, Pb, Ag, Cu), Olinghouse...Olinghouse (Au, Ag), and Peavine (Ag, Cu, Pb) in Washoe County. Several of the districts, such as Yerington, Mineral |  | | Report (issue) | | ve ni y rsit of Tennessee–K no xv i lle Sc ce i en e T ec tonic s R es earc h nc Carolina Geological.......................... 19 John M. Garihan The Walker Top Granite: Acadian granitoid or eastern Inner...136 Scott D. Giorgis STOP 10 Sillimanite Schist–Walker Top Granite contact above Sisk Gap ..............Scott D. Giorgis STOP 11 (ALTERNATE) Walker Top Granite near Walker Top Mountain ................................. 138 James L. Kalbas STOP 13 Devonian Walker Top Granite east of St. Johns Lutheran Church on |  | | Journal (issue) | | Finger) and LKA Emeralds from Hiddenite, Alexander County, NC to Go On Public Exhibit in New York City Emeralds...in question had been found at the Koffiefontein Mine, located in the village of Koffiefontein, in the...News----------------- Page Gold at the Isabella Pearl Mine ' Mineral Co., Nevada Tony ikjscher tony@cxcaliburmincral...and evada, USA. In June, 2018. groundbreaking began at the surface/open pit Isabella Pearl Mine in Mineral...Mining Unit. which also includes the Mina Gold. County Line and East Camp Douglas propertie . The Project |  | | Report (issue) | | (O)xeloularle K-bentonites of Eastern North America Dennis R. Kolata, Warren D. Huff, and Stig M. Bergstrom...Bergstrom SPECT ie | Pi Ordovician K-bentonites of Eastern North America Dennis R. Kolata Illinois...Cataloging-in-Publication Data Kolata, Dennis R. Ordovician K-bentonites of eastern North America / Dennis R. ...Cover: The Deicke K-bentonite Bed in the Eggleston Formation near Hagan, Lee County, Virginia. Photograph taken...SA % We Ro ering © SURG OO Pied Icemilicatonior K-DeMtOOMES —si. 6 ic a.ce 5 c ie Rcataaa, Bie AUIS |  | | Report (issue) | | February 2001 Field Trip Leader: Tim Marsh, AMT (USA) Inc. THIS PAGE INTENTIONALLY BLANK Geologic...Copper Creek district Timothy M. Marsh, PhD AMT (USA) Inc. 7400 N. Oracle Road, Suite 343 Tucson, AZ 85704...Arizona, 12 miles east of BHP's San Manuel-Kalamazoo mine/mill/smelter complex, and 25 miles southeast of...lagioclase porphyry having an aplitic quartz/K-feldspar groundmass, is most closely related to economic...IIIIJ Tactlte Mapping compiled from files of AMT (USA) Inc., including contributions by Guthrie (unpubL |  | | Journal (article/letter/editorial) | | SCEPaEN E. KESLER, Lo•sM. JONES, ANDRAYMOND L. WALKER Abstract Petrographic, chemical,and isotopicstudyof...per-related intrusions in islandarcsare poorerin K-feldsparthan are their craton counterparts.Although...cratoncounterparts and eventhe quartzmonzonites lack K-feldsparphenocrysts.Island arc intrusionsalso appearto... To the west,in 515 516 KESLER, JONES, .dND WALKER 74ø 73ø 72 ø 71ø 70ø 69ø 68 ø 18"'-• '---J18"...BATHOLITH • 69 ø .- SAN JUAN • ••. 'COPPER MINE x•'LAMUDA_- POINT VIRGIN ISLAND ø ISLANDS |  | | Journal (article/letter/editorial) | | Copyright © 1998 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/98 $19.00 1 .00 Pergamon...Environmental Sciences, University of Virginia, Charlottesville, Virginia 22903, USA (Received June 18, 1997; accepted...for three forested watersheds in the southeastern USA. One watershed (Shaver Hollow) is underlain by Precambrian...granodiorite watershed indicate that plagioclase feldspar is the dominant reactant and that basalt dikes...watersheds indicate contributions from plagioclase feldspar, muscovite, and biotite. At best, the mass balance |  | | Journal (article/letter/editorial) | | Sodicalterationis characterized by the replacementof K-feldsparby albite and of biotite by chlorite.Copper...temperaturealterationis associated only with the Walker Biver intrusion.The hydrothermalsystemassociated...temperatureassemblages prior to emplacement of the Walker Biver dikes. Phaseequilibriaand geologicreconstruction...mineral as- mine area can be reconstructed to allow observations sociationof quartz+ K-feldspar+ sericite+...AONZONITE /• '•/'•//• /• /•' //f' PORPHYRY WALKER DIKE RIVER SWARM 3000 FIG. 2. Reconstructionof |  | Ni, Pei, Wang, Guo-Guang, Yu, Wen, Chen, Hui, Jiang, Lai-Li, Wang, Bo-Hua, Zhang, Huai-Dong, Xu, Ying-Feng (2015) Evidence of fluid inclusions for two stages of fluid boiling in the formation of the giant Shapinggou porphyry Mo deposit, Dabie Orogen, Central China. Ore Geology Reviews, 65. 1078-1094 doi:10.1016/j.oregeorev.2014.09.017 | Journal (article/letter/editorial) | | porphyry, and monzogranite. They are composed of K-feldspar, quartz, plagioclase, biotite, and accessory...composed of biotite, plagioclase, hornblende, K-feldspar, quartz and minor sphene, apatite, magnetite...late-stage quartz syenite (116 Ma) is composed of K-feldspar, quartz, plagioclase, biotite, and minor sphene...and wallrocks. The gangue minerals are quartz, K-feldspar, sericite, and chlorite, with lesser amounts...observed, but K-feldspar grains are scarce in the inner silicic zone (Fig. 5A–B). K-feldspar grains become |  | | Journal (article/letter/editorial) | | www.elsevier.com/locate/lithos How late are K-feldspar megacrysts in granites? R.H. Vernon a,b,⁎, S...Southern California, Los Angeles, CA 0089-0740, USA Received 12 October 2007; accepted 6 January 2008...Abstract Various petrologists have suggested that K-feldspar megacrysts grow in granites that are extensively...experimental evidence indicates that, though K-feldspar nucleates relatively late in the crystallization...factors, favours a magmatic/phenocrystic origin for K-feldspar megacrysts in granites, namely simple twinning |  | | Report (volume) | | Paradise Range and Northern Pactolus Hills, Nye County, Nevada U.S. GEOLOGICAL SURVEY BULLETIN 1974 ...California--Bldg. 3, Rm. 3128, 345 Middlefield Rd. RESTON, Virginia--National Center, Rm. 1C402, 12201 Sunrise Valley...Paradise Range and Northern Pactolus Hi lis, Nye County, Nevada By DAVID A. JOHN U.S. GEOLOGICAL SURVEY...Paradise Range and Northern Pactolus hills, Nye County, Nevada I by David A. john. p. em. -(U.S. Geological...references. 1. Volcanic ash, tuff, etc.-Nevada-Nye County. 2. Geology, Stratigraphic-Oligocene. 3. Geology |  | | Journal (article/letter/editorial) | | pegmatite wall zones, Black Hills, South Dakota, USA B.L. JOLLIFF,'J.J.PAPIKE,* andC.K. SHEARER' ‘Department...Washington University, St. Louis, MO 63 130499, USA *Institute of Meteoritics, Department of Geology...University of New Mexico, Albuquerque, NM 87 13l- 1126, USA (Received January 6, 1992; accepted in revised form...pegmatite are similar to those of muscovite from K-feldspar-rich assemblages of other pegmatites where the...1915 1916 B. L. Jolliff, J. J. Papike, and C. K. Shearer I 0.5 0 SCALE EXPLANATtON koqadr: _ |
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