 | | Journal (article/letter/editorial) | | VIRGINIA MINES AND MINERALS (PART GOOCHLAND By PHILIP East Derry, COUNTY In N edge of the James R...of Richmond and bordering Fluvanna Co. with which it shares the gold belt. CounĀ ty Seat is Goochland... Quads; Columbia (15) which carries most of the gold area, Lakeside Village (15), and the following (7V2)...Line Creek Mills. Extensive gold mining formerly on exĀ treme W and county line around Rte 605 to Rte...and soapstone Qs. and very old coal mines. Pryer Gold M. Placer on Busby Branch with several shafts. 11/4 |  | | Report (issue) | | the coverāTurquois crystals from Lynch Station, Virginia; x ca.; phoĀ tograph by Neal Ycdlin; color plates...C. A. Michael. COLD NUGGET FROM SPOTSYLVANIA COUNTY: Longest dimension approximately 13 cm., photograph...of Virginia R. V. DIETRICH* Professor of Geology and Associate Dean of Arts & Sciences, Virginia Polytechnic...Polytechnic Institute Research Division Bulletin 47 Virginia Polytechnic Institute, Blacksburg, Va. 24061 *... Ā© R. V. Dietrich and the Research Division of Virginia Polytechnic Institute, 1970 Printed and bound |  | Mota-E-Silva, Jonas, Prichard, Hazel M., SuĆ”rez, Saioa, Ferreira Filho, Cesar F., Fisher, Peter C. (2016) Supergene Alteration of Platinum-Group Minerals and the Formation of Pd-Cu-O and Pd-I-O Compounds In the Limoeiro Ni-Cu-(PGE) Deposit, Brazil. The Canadian Mineralogist, 54 (3) 755-778 doi:10.3749/canmin.1500049 | Journal (article/letter/editorial) | | pentlandite and pyrrhotite to produce violarite and pyrite, respectively. Chalcopyrite is more stable, beginning...of the Te has been released into the adjacent goethite. With progressively more weathering towards the...appears partially dissolved and pseudomorphed by goethite, which is often coated with newly formed Pd-Cu6Bi...aqueous geochemical conditions at low temperatures (Bowles 1986, Brookins 1987, Taufen & Marchetto 1989)....recently have been discussed in several studies (e.g., Bowles 1986, Kwitko et al. 2002, OberthuĢr et al. 2003 |  | SuĆ”rez, Saioa, Prichard, Hazel M., Velasco, Francisco, Fisher, Peter C., McDonald, Iain (2010) Alteration of platinum-group minerals and dispersion of platinum-group elements during progressive weathering of the Aguablanca NiāCu deposit, SW Spain. Mineralium Deposita, 45 (4) 331-350 doi:10.1007/s00126-009-0275-x | Journal (article/letter/editorial) | | regional survey in the Ossa-Morena Zone. Rio Narcea Gold Mines Ltd. operated an open pit from 2004 until...Ni, 0.46% Cu, 0.47 g/t PGE and 0.13 g/t Au. The mine has an estimated production life of 10.5 years based...development. At present, the annual production of the mine is approximately 8,136 t of Ni and 7,071 t of Cu...composed of pyrrhotite, pentlandite, chalcopyrite and pyrite with minor marcasite, covellite and violarite....pentlandite, less chalcopyrite and occasionally pyrite. A few grains are found at the contact between |  | | Journal (article/letter/editorial) | | SPECIAL ISSUE ON CRITICAL RAW MATERIALS JOHN F.W. BOWLES ET AL. 10.1180/minmag.2017.081.110 *E-mail: John...110. from one region, country or even a single mine, there is a significant potential for problems with...distribution in the Neves-Corvo deposit, Iberian Pyrite Belt, Portugalā (Carvalho et al., 2018) which was...sphalerite, goethite and hematite, Ge is found mainly in willemite, and In occurs in goethite and hematite...tƶrnebohmite-(Ce). The type material is from the MalmkƤrra mine, but it also occurs in the Johanna and Nya BastnƤs |  | | Journal (article/letter/editorial) | | localities. The state motto, Ora y Plata meaning āgold and silver,ā and the state seal with its representation...mining origins. Montanaās production of copper, coal, gold, lead, manganese, phosphate, silver, talc, vermiculite...Stuart established Montanaās first mining camp at Gold Creek in 1860. Geologic Provinces The state can...view showing the Indian Queen mine ca. 1905 at Farlin, Beaverhead County. 208 ROCKS & MINERALS Downloaded...Rocky Mountains, and furthest to the northwest, the belt basin. The Rocky Mountains contain sedimentary, |  | | Book (volume) | | instance, a single Spodumene crystal from the Etta Mine near Keystone on the east side of the Mount Rushmore...The commercial production of minerals, principally Gold, Silver, Copper, Iron, Lead, Manganese and Zinc...beds, excavations, etc.ļ¾Selenite roses. BRULE COUNTY AREA: in the Oacoma zone of the Pierre Fm. On Elm...ļ¾gray Barite rosette up to 5 or 6 inches. CAMPBELL COUNTY MOUND CITY, W to the Missouri R., regional hillsides...gravels, etc.ļ¾petrified wood, wood opal. CORSON COUNTY LITTLE EAGLE: ļ area ridges, slopes, stream beds |  | Liu, Jia-Jun, Yang, Long-Bo, Dai, Hong-Zhang, Yuan, Feng, Zhu, Bing-Yu (2014) Discovery and significance of Cu-Zn intermetallic compounds in the Jingxi gold deposit, western Tianshan Mountains, NW China. Geological Journal, 49 (6) 584-598 doi:10.1002/gj.2583 | Journal (article/letter/editorial) | | significance of CuāZn intermetallic compounds in the Jingxi gold deposit, western Tianshan Mountains, NW China JIA-JUN...Jingxi gold deposit, NW China. The host rocks, siliciļ¬ed tuff and andesite, are cut by pyrite-bearing...intermetallic compounds is golden yellow, similar to gold but slightly more white, with a reļ¬ectivity that...lower than that of Au and is more close to that of pyrite. They are weakly bireļ¬ectant, ranging from bright...which has an over 80% Cu content. In the Jingxi gold deposit, the CuāZn intermetallic compounds occur |  | Park, Y.-R., Ripley, E. M., Miller, J. D., Li, C., Mariga, J., Shafer, P. (2004) Stable Isotopic Constraints on Fluid-Rock Interaction and Cu-PGE-S Redistribution in the Sonju Lake Intrusion, Minnesota. Economic Geology, 99 (2) 325-338 doi:10.2113/gsecongeo.99.2.325 | Journal (article/letter/editorial) | | replaced chalcopyrite and pyrite with goethite. In the Cu-rich zone, goethite that replaces chalcopyrite...PGE-rich intervals in the Freetown layered complex (Bowles, 2000), the Lake Owen intrusion (Louckes and Glasscock...Anorthositic Series o E K A PALEOPROTEROZOIC Virginia/Rove Fm Biwabik/Gunflint Fe-Fm L 0 10 20 30...%) showing variable degrees of replacement by goethite is the most common sulfide mineral identified...minerals as well as interstially (Fig. 6AāC). Rims of goethite are commonly found on chalcopyrite grains. Chalcopyrite |  | | Journal (article/letter/editorial) | | N E , MARCH 1992, VOL 56, PP. 123-126 Gold from Botallack mine, St. Just, Cornwall DURING a recent examination...samples from cliff exposures near Botallack mine (SX 362340) gold was observed in hand specimen and in thin...Identification was confirmed by microprobe analysis. Although gold has been found in mineralised lodes elsewhere in...district (C. J. Stanley, pers. comm.). The BotaUack mine is well known for the occurrence of an extensive...the hematite-goethite-limonite cherty gossan along with occasional quartz nodules. Gold was observed |  | | Journal (article/letter/editorial) | | com/locate/gca Aqueous uptake of uranium onto pyrite surfaces; reactivity of fresh versus weathered...understand the interaction between aqueous uranium and pyrite (FeS2) the uptake of uranium onto the surfaces...surfaces of both weathered and freshly generated pyrite surfaces was examined using batch sorption experiments...results clearly indicate that freshly polished pyrite surfaces are eļ¬cient scavengers of uranium from...also indicate partial reduction of uranium at the pyrite surfaces, with a heterogeneous distribution of | | | Journal (article/letter/editorial) | | pp. S307āS320 Supergene gold enrichment in the Castromil-Serra da Quinta gold deposit, NW Portugal C....July 2017; Associate Editor: John Bowles] ABSTR ACT Several gold deposits hosted mainly by Variscan...surface galleries. The Castromil-Serra da Quinta gold deposit is an important example of such a mined...(CIZ) in the western branch of European Variscan belt, mainly on the eastern flank of the Valongo anticline...mineralization. The gossan is composed essentially of goethite, scorodite and clay minerals. A recent drilling |  | | Book (volume) | | Marcasite, Pyrite, Selenite and Sphalerite. A few alluvial Diamonds have been found. ASHTABULA COUNTY CONNEAUT...CLERMONT COUNTY MILFORD, area creek gravels and alluvial deposits, rareāÆDiamond. CLINTON COUNTY WILMINGTON...depositāÆHematite. COSHOCTON COUNTY AREA, townships of Washington, Virginia, Bedford, Jackson, Jefferson...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarriesāÆoilstone. DELAWARE COUNTY DELAWARE... as clusters and nodulesāÆPyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide |  | | Book (volume) | | Marcasite, Pyrite, Selenite and Sphalerite. A few alluvial Diamonds have been found. ASHTABULA COUNTY CONNEAUT...CLERMONT COUNTY MILFORD, area creek gravels and alluvial deposits, rareāÆDiamond. CLINTON COUNTY WILMINGTON...depositāÆHematite. COSHOCTON COUNTY AREA, townships of Washington, Virginia, Bedford, Jackson, Jefferson...CUYAHOGA COUNTY CHAGRIN FALLS (on Geauga Co. line), area quarriesāÆoilstone. DELAWARE COUNTY DELAWARE... as clusters and nodulesāÆPyrite (crystals sharply cubic). FRANKLIN COUNTY COLUMBUS, area countywide |  | | Report (issue) | | Zellinger, 1980; Wenrich-Verbeek and Verbeek, 1980; Bowles, 1977; Hoffman, 1977; Gornitz and Kerr, 1970; and...younger Paleozoic rocks, is the mechanism proposed by Bowles (1965) for the formation of these pipes. Other...depressions mapped for this study, including the Riverview mine, to samples from the Grandview pipe and published...(1969) and Gornitz and Kerr (1970) on the Orphan mine (these are the two closest known mineralized breccia...also been mapped by Loughlin (1983). The Riverview mine (number 172), the only collapse feature in the study |  | | Journal (article/letter/editorial) | | Pt andPd concentrations of 1 to 10 ppb nearthe pyrite+ pyrrhotite+ magnetitetriplepoint(i.e., near-neutral...concentrations of at least10 ppt maybe attainednearthe pyrite + pyrrhotite + magnetitetriple point.At ā¢S = 0...hydrother- hydrothermal in origin,including quartz-gold-platimal fluidsin the genesisof depositsof the plati-...schiefer(Kucha,1975, 1982) and the Zambia-Zaire copper belt (Mertie, 1969, p. 48). Furthermore, platinumcontentsof...complex.Log b is a term representinga staculatedthat a gold concentrationaslow as 10 to 20 tistical factor which |  | | Report (issue) | | GEOLOGICAL SURVEY DESCRIPTION AND GRADES AND TONNAGES OF GOLD-BEARING SKARNS by Greta J. Orris 1 , James D....nomenclature. 1 Menlo Park, California 2 Reston, Virginia 1987 INTRODUCTION A significant proportion...the discovery of deposits such as Battle Mountain Gold Company's Fortitude deposit, Nevada and Experanza...other deposits have been generally referred to as gold skarns in the literature and occasionally further...tonnage distributions are shown in figures 1 and 2. Gold-bearing skarns can, as a first approximation, be |  | Aye, Beyanu Anehumbu, Sababa, ElisĆ©, Ndjigui, Paul-DĆ©sirĆ© (2017) Geochemistry of S, Cu, Ni, Cr and Au-PGE in the garnet amphibolites from the Akom II area in the Archaean Congo Craton, Southern Cameroon. Geochemistry, 77 (1) 81-93 doi:10.1016/j.chemer.2017.01.009 | Journal (article/letter/editorial) | | quartz, and accessory apatite, spinel, sericite, pyrite, chalcopyrite and non-identiļ¬ed opaque minerals...minerals are constituted of kaolinite, gibbsite, goethite and hematite. Despite the accumulation of some...JohnsManville (JM) reef of the Stillwater complex, USA; and (v) ā Corresponding author. E-mail address:...amphibolites from the Akom II area within the greenstone belt in Southern Cameroon. 2. Regional geological setting...is made up of a foliated series and a greenstone belt (Ganno et al., 2017): (i) the foliated series include |  | | Journal (article/letter/editorial) | | Freetown Layered Complex, Sierra Leone John F. W. Bowles 1 & Saioa SuĆ”rez 2,3 & Hazel M. Prichard 2 & Peter...Editorial handling: M. Fiorentini * John F. W. Bowles john.bowles@manchester.ac.uk 1 School of Earth...layer (Pollett 1931, 1951; Barber 1962). However, Bowles (2000b) has demonstrated the existence of PGE-bearing...associated with minor Cu-rich and Ni-poor sulfides (Bowles et al. 2013). The present study investigates the...igneous horizon, Horizon B, enlarging on the study by Bowles et al. (2013), (ii) adjacent weathered rock, and |  | | Journal (article/letter/editorial) | | Bushveld/Great Dyke scenario, and in all Complex, USA). Placer deposits in Russia and in Colombia were...modest contributions from Zimbabwe, Canada, and the USA. Contributing to the Debate Allogenic versus Authigenic...the Great Dyke, Zimbabwe; the Stillwater Complex, USA). Placer deposits in Russia and in Colombia were...Africa the dominant in mining supplying Complex, USA). Placer deposits in Russia in is Colombia werecountry...and modest contributions Zimbabwe, Canada, and the USA. and later Norilsk in Russia came Bushveld Complex |  | | Journal (article/letter/editorial) | | crystals (~1 ā®m) were found on the surface of a gold nugget from Gongo Soco, an iron ore deposit in Minas...on the pre-existing gold nugget. Keywords: rosettes, oxygen-bearing palladium, gold nugget, Gongo Soco...platinum-group minerals (PGM) in laterites (e.g., Bowles 1986, 1995). The neoformation of PGM in the supergene...when Wollaston (1809) investigated samples from gold mines in Brazil, possibly from Minas Gerais [vide...MINERALOGIST palladium in residual concentrates from the gold washing at Itabira, later identified by electron-microprobe |  | Economou-Eliopoulos, Maria, Laskou, Magdalena, Eliopoulos, Demetrios, Megremi, Ifigeneia, Kalatha, Sofia, Eliopoulos, George (2021) Origin of Critical Metals in FeāNi Laterites from the Balkan Peninsula: Opportunities and Environmental Risk. Minerals, 11 (9) 1009 doi:10.3390/min11091009 | Journal (article/letter/editorial) | | and locally transported limonite zone; and (5) a goethiteāhematite zone [23]. Although FeāNi Ā± Co laterites...by Tertiary molasses. A goethite zone, 5-m thick, consisting mainly of goethite and hematite overlies a...towards the top. The FeāNi ore is mainly composed of goethite, hematite, Ni-bearing chlorite, quartz, calcite...Ā± Co laterite deposits are mostly composed of goethite, limonite, hematite, Ni-bearing chlorite, Fe-chlorite...weathering crust, are composed of a pelitic matrix (goethite, hematite), clastic grains of quartz and chromite |  | | Report (issue) | | 99201 2U.S. Geological Survey, Tucson, AZ 85705, USA 1990 5/14/91 TABLE OF CONTENTS Executive Summary...assay dore beads for the Platinum-Group Metals and Gold APPENDIX C: Analytical techniques for the Platinum-group...South Kalimantan. Figure 16. Photograph of flattened gold and PGM particles from near Cempaka, South Kalimantan...Rambas, South Kalimantan. Figure 31. Photograph of gold, PGM and diamond grains from concentrate RMP 89042...South Kalimantan. Table 12. Platinum, palladium, and gold analyses of rock samples, Riam Pinang area, South |  | Aiglsperger, Thomas, Proenza, Joaquin A., Zaccarini, Federica, Lewis, John F., Garuti, Giorgio, Labrador, Manuel, Longo, Francisco (2015) Platinum group minerals (PGM) in the Falcondo Ni-laterite deposit, Loma Caribe peridotite (Dominican Republic) Mineralium Deposita, 50 (1) 105-123 doi:10.1007/s00126-014-0520-9 | Journal (article/letter/editorial) | | George Washington University, 20052 Washington, DC, USA F. Longo Falcondo Glencore, Box 1343, Santo Domingo...previously been reported from the platiniferous Au-Pd belt of Minas Gerais, Brazil (e.g., Cabral et al. 2009...cover of the Loma Caribe peridotite in the Falcondo mine is known as the largest Mg silicate-type Ni-laterite...investigated Nilaterite profiles in the Falcondo mine can be divided into two main horizons: Fe oxide...Several subzones from A to F are distinguished by mine geologists based on Ni, Fe, and Mg contents, texture |  | | Journal (article/letter/editorial) | | Supergene gold mineralogy at Ashanti, Ghana" Implications for the supergene behaviour of gold R. J. BOWELL*...5NH Abstract A t the Ashanti concession, Ghana, gold-bearing quartz veins and disseminated sulphide lodes...hypogene ore zone. In the unweathered hypogene orebody, gold occurs as free grains in quartz, as sub-microscopic...disseminated arsenopyrite, as gold tellurides and as aurostibite. The gold is released from the hypogene...complexing. Dissolution and reprecipitation of the gold appears to have taken place largely in situ with |
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