 | | Journal (article/letter/editorial) | | zones, West Santa Comba-Fervenza Area (Galicia, NW Spain): A mineralogical study R. Castroviejo E.T.S...Polit6cnica de Madrid), c/ Rios Rosas, 21 - 28003-Madrid (Spain) Received: May 1989/Accepted: September 6, 1990...terranes, some 40 km NW of Santiago de Compostela (NW Spain). The orebodies are bound to late-stage Hercynian...Ore mineralogy, alteration, and ore textures define a frame whose main features are common to all prospects...arsenopyrite and pyrite - accompanied by quartz, adularia, sericite, + (tourmaline, chlorite, carbonates |  | | Journal (article/letter/editorial) | | Cambridge, DowningStreet,Cambridge CB23EQ,England A. E. MVSSETr,ANDR. D. J. OGLETHORPE Departmentof EacthSciences...monzonite intrusionsin the center of the caldera,and adularia-sericiteepithermalmineralization (the Emperorgolddeposit)on...intracalderavolcanism.The last magmaticevent within the caldera,a banakitevent-phase pyroclastic unit, occurredat 4...activityis deemedto be synchronous with magmatism, but a measurable intervaloccursbetweenmagmatism and epi...Tavua existsto examinethe speedof the developmentof a rocksareclassified hereaccording to the nomencla- |  | | Journal (article/letter/editorial) | | Endogenic ore zonation in a volcanogenic goldsilver deposit A. N. Nekrasova , A. A. Krasil'nikov & G. P....article: A. N. Nekrasova , A. A. Krasil'nikov & G. P. Denim (1980) Endogenic ore zonation in a volcanogenic...June 2016, At: 04:04 Endogenic ore zonation in a volcanogenic gold-silver deposit Downloaded by [The...gold-silver asso ciation, normally characterized by a small vertical range in mineralization and uneven...mineral composition in extreme detail, and to identify a series of rarely encountered and little-studied minerals |  | Campbell, Andrew R., Banks, David A., Phillips, Randall S., Yardley, Bruce W. D. (1995) Geochemistry of Th-U-REE mineralizing magmatic fluids, Capitan Mountains, New Mexico. Economic Geology, 90 (5) 1271-1287 doi:10.2113/gsecongeo.90.5.1271 | Journal (article/letter/editorial) | | MiningandTechnology, Socorro, NewMexico87801 DAVID A. BANKS, Department of EarthSciences, University of...theplutonarecharacterized bysmoky andclearquartz,fluorite,adularia, hematite, calcite, thoritc,titanitc, allanitc...andclayminerals. Fourmaintypesoffluidinclusions representing a largerangein temperatureandsalinity occurin thequartzandfluorite...NaC1-KC1-H20 system. Theobserved Th-salinity trendssuggest a fluidevolution from the originalparentfluidby coo...chemicalcomposition of the inclusion fluidwasdetermined by a crushandleachextraction andanalysis by ICP-MS,ICP-AES |  | | Journal (article/letter/editorial) | | ppm Sb, 4 X 10-5 ppm Au, 6 X 10-4 ppm Ag, 7 X 10-a ppm T1 and 120 ppm total sulfidesulfur. At depths...ascendvia fissure zones and permeablestrata through a sequenceof near horizontal stratified silicic Quaternary...ackebasement. A zoned alteration pattern is developedin the countryrockswith adularia, sericite,and quartz..."invisible" gold ores that occur in the western U.S. A. at the Getcheil,White Caps, Carlin, Cortez, and ...geothermal recent past in all of them. However, only a few brinesin California,the hot brinesand precipitates |  | | Catalog/List | | Additionally, I have included some specimens belonging to a personal friend who, like myself, is an advanced collector...collector continuously upgrading his collection. A feature of the specimens offered is that as they are...are all ex collection and in many cases ex a sequence of collections, many of the specimens represent...SPECIMEN ORIGINS Every specimen will be accompanied by a personal collection label which gives very detailed...Mexico. Fine, pale-lemon coloured, transparent A/l. xtls, plus a little interdeveloped gemmy Calcite, richly |  | | Journal (article/letter/editorial) | | Even i f a visit is not pos sible, many German collectors are anxious to trade their mate rial for minerals...needs and offer ample opportunity for many sports. A l though the Clara mine is the mineralogists' chief...ores were mined for short periods during that time ( A . Osann, 1927), while barite production commenced...remains is a sys tem of open pits, dumps, and closed tunnels. The new Clara mine is a mile and a quarter...will continue to come to light for a long time. The ore is brought to a flotation plant in Wolfach some |  | | Journal (article/letter/editorial) | | deposit was discovered in 1966 by V.P. Pokazan’ev, a geologist of the Seimchan Branch of the Northeastern...Pokazan’ev, 1975). The Omolon Mas sif is situated at a significant distance from the large ancient structural...median massif is regarded as a brokenoff block of the Siberian Craton or as a terrane, i.e., tectonic block...block that lost links with a tectonic unit from which it has broken off. The rec ognition of the socalled...is an element of the Yana– Kolyma Fold System and a central part of the ancient Kolyma–Omolon Arch. The |  | | Catalog/List | | for packing, carriage or postage. We try to include a wide selection in terms of species, sites and price...Show venues in order to ‘give you sight’ of as wide a variety as we can of our very large stock (currently...condition, of unsatisfactory material. Where available a close substitute will be offered unless otherwise...you want, remember, our lists can only represent a tiny fraction of current stock. IVER HEATH MINERAL...brecchiated Shilale/Siderite matrix. •B'. Specimen 'A*. 5x2-Jx1-J", £5-50. 'Z ‘_ 2£x2x1", £4.25. ALMANDINE |  | | Report (issue) | | _______________——————— 5. Euhedral adularia crystals that line a cavity _______________________—————————...dachiardite — 11. Scanning electron micrograph showing a closeup of acicular aggregates of polysynthetically...KEITH E. BARGAR and MELVIN H. BEESON ABSTRACT Y-6, a U.S. Geological Survey research diamond-drill hole...of Yellowstone National Park, Wyoming, penetrated a surface covering of Pinedale glacial sediments and... mixed-layer illite-smectite and smectite) and a 10-A mica. There is some indication that the waters |  | | Journal (article/letter/editorial) | | numerousplacesin the CrystalMountainsandotherlocalities in a beltof country25 miles wide and 75 mileslong extendingfrom...collections of institutions and individuals, and a rela- tively largevolumeis utilizedin the construction...proportions. Someof the largercrystals,weighinghalf a poundor moreeach, are suitable for the manufacture...the entiresupplyof clearquartzcrystals,weighinghalf a pound or moreeach,wouldnormally notexceed 1,000pounds...the 6 prism and 6 pyramid facesbut really there is a great variety of other facesand shapes including tabular |  | | Journal (article/letter/editorial) | | Primorye, Russia V. V. Seredina and I. Yu. Chekryzhovb a Institute of Geology of Ore Deposits, Petrography...are presented. In addition to the Au–Ag quartz–adularia veins known since the 1970s (Soyuzny deposit)...conjugate hydro thermal systems functioning above a longliving magma chamber. DOI: 10.1134/S107570151103007X...of the Sikhote Alin Range attracted attention for a long time, owing to its anomalous ore potential. The...appeared at the end of the 19th century. E.E. Anert, a wellknown researcher of geol ogy and mineral resources |  | | Catalog/List | | Winter 1991 /euJ315 AfN 8 Sp. A/N 8/Cu/315 p, .. -••"" , arr Sp A/N 8/Cu/31S lftt"C'IIM tif lfrllT1F...collection. Realism concerning plans to shorlly move into a smaller residence has concentrated my thinking regarding... Thia rich specimen wa.s sel! collected in 1972. A greisened granitic slice with upper surface covered...in greenish to very dark brown,acicular xtls, plus a rich intergrowth of gemmy brown Caasiterites and platey...ACT1;;01I'rE. Lcvant Zawn,':'rewellard,'J.Cornwall. A thick,rich,intergrown mat of sparkling,grecnish-brown |  | | | | Winter 1991 /euJ315 AfN 8 Sp. A/N 8/Cu/315 p, .. -••"" , arr Sp A/N 8/Cu/31S lftt"C'IIM tif lfrllT1F...collection. Realism concerning plans to shorlly move into a smaller residence has concentrated my thinking regarding... Thia rich specimen wa.s sel! collected in 1972. A greisened granitic slice with upper surface covered...in greenish to very dark brown,acicular xtls, plus a rich intergrowth of gemmy brown Caasiterites and platey...ACT1;;01I'rE. Lcvant Zawn,':'rewellard,'J.Cornwall. A thick,rich,intergrown mat of sparkling,grecnish-brown |  | | Catalog/List | | Truro, Cornwall, TR1 2D A. Telephone: Truro 223227 BUSINESS AS USUAL! Same ship but a new captain! The great...time to time to take the view, however there is now a new captain at the helm. Ports of call this year are...also contain a special section of unusual and rare cut gemstones. However no list or show is a substitute...developed on usual Gossan matrix. 2£x2xl£", £8.00. ADULARIA/SCHORL. Whiskey Lode,Geevor Mine.Pendeen,West...ALSTONITE. Fallowfields Mine,Nr.Hexham,Northumbria. A 2x£" channel developed in and traversing,from face |  | Ruggieri, Giovanni, Lattanzi, Pierfranco, Luxoro, Silvana S., Dessi, Roberto, Benvenuti, Marco, Tanelli, Giuseppe (1997) Geology, mineralogy, and fluid inclusion data of the Furtei high-sulfidation gold deposit, Sardinia, Italy. Economic Geology, 92 (1) 1-19 doi:10.2113/gsecongeo.92.1.1 | Journal (article/letter/editorial) | | andinterlayered epiclastic andsedimentary sequences. A phreatic and/orphreatomagmatic diatreme breccia alsocropsoutin...(markedbythe presence of montmorillonite), whichpasses to a districtwide propylitic alteration halo. The ores...in silicabodies.The Furteimineralization comprises a surficial oxidized zoneof supergene natureanda deeperprimarysulfide...zone(upto 300 m of verticalextension) is characterized by a verticalzoningof the mineralassemblage: at higher...datasuggesting the presence of an intrusion at approximately a 1- to 1.5-kindepth.A few relatively highsalinity (around |  | | Journal (article/letter/editorial) | | slate. chloritic schibt, marble and the like, INSIDE A CHURCH ORGAN, and They contain no pebbles or sand...assume a new texture, It may be proyed that fossiliferous strata havc exchanged an earthy for a llighly... and keys, responsive to the touch of The mat..rial� the musicia.. of these I'trata wpre originally...three classes 21 It may seem almost a shattering of one's a third; and there is another called the...organ: indeed. The low pitched pipes; likened to a long sballow box,divid, d by numf-r"u" lnngitudll1al |  | | Journal (article/letter/editorial) | | Trains at Au–Ag Mineral Deposits R. G. Kravtsova, L. A. Pavlova, and Yu. I. Rogozina Vinogradov Institute...modes of occurrence of the indicator elements of a certain mineralization type [1–3]. We pioneered such...mineral deposit, and this type of ore mineralization as a whole. The Dukat deposit has the largest Ag reserves:...native Ag, kustelite, pyrargyrite, electrum, and, to a lesser extent, sternbergite, proustite, polybasite...sulfates soluble in water [8, 13]. Exploration (at a scale of 1 : 50000) of lithochemical dispersal trains |  | | Journal (article/letter/editorial) | | description of localities. A R K A N S A S H A S A R I C H M I N E R A L and mining heri tage that...tion: Henry Barwood, Henry de Linde, Mike Howard, A l Kidwell, Don Owens, Charles Steuart, Meredith York...been published.* Like them, it is not intended to be a col lecting guide. However, pertinent information...interest. A ( T ) after a mineral indicates that this is the type locality for this min eral. A n (m) after...after a mineral indicates it is solely or best rep resented by microcrystals. A (?) indicates that the |  | | Journal (article/letter/editorial) | | amounts of silver, lead, cop per, and zinc. T H E C A M P B I R D M I N E , located 6 miles southwest of...referred to as the Switzerland of America and is a mecca for mineral collectors, back packers, and four-wheel-drive...of over 400 inches not uncom mon. Avalanches are a constant danger during the winter months, and many...Bird mine and other gold mines in the " S a n Juan Triangle," S a n Juan Mountains, Colorado. Walsh discovered...profitable and famous mines in Colorado and made Walsh a millionaire many times over. Profits from the mine |  | | Journal (article/letter/editorial) | | Vol. 83, 1988, pp. 511-523 Active Ore Formationat a Brine Interface in MetamorphosedDeltaic LacustrineSediments...The SaltonSeaGeothermalSystem,California MICHAEL A. MCKIBBEN, TunellEconomic Geology Laboratory, Department...deltaic,lacustrine,andevaporiticsediments deposited in a modern continentalrift zone.Temperatures up to 365øC...to 2 km, parallelingthe 250øC isothermalsurface. A modelis developedfor type 2 vein ore formationinvolvingmixingat...interface,formingtype2 veins.Thehypersaline brine risesto a level of density-temperature stabilization, causi |  | | Journal (article/letter/editorial) | | Pampeanas of San Luis, Argentina a b N. P. Urbina , P. Sruoga & L. Malvicini b a Universidad Nacional de...Argentina b CONICET , Secretaría de Minería , Av. J. A. Roca 651, Capital Federal, 1322, Argentina Published...MALVICINI CONICET, Secretaría de Minería, Av. J. A. Roca 651, 1322 Capital Federal, Argentina Downloaded...Argentina, Late Tertiary volcanic rocks extend along a 80-km NW-SE-trending belt, between La Carolina and...genetically related to the volcanic rocks, formed during a volcanic episode that occurred between 9.5 Ma and |  | | Catalog/List | | "Endsleigh'', 50 Daniell Road, Truro, Cornwall, TR1 2D A. Telephone: Truro 223227 NEWS AND INFORMAT8ON The...popular. A new selection of rare cut gemstones is therefore offered. Iver Heath Show was a great success...inexpensive items. We do reserve the right to make a small charge to cover Bank Charges, we pay on the...00. 4. ANGLESITE. Tsumcorp Hine,0tavi,Namibia. A single matrix-free terminated colourless transparent...x 50mm x 50mm. £5.00. ANTIMONY. Montril,Granada,Spain. Small rare reference specimen of crystalline native |  | Citton, Paolo, Ronchi, Ausonio, Maganuco, Simone, Caratelli, Martina, Nicosia, Umberto, Sacchi, Eva, Romano, Marco (2019) First tetrapod footprints from the Permian of Sardinia and their palaeontological and stratigraphical significance. Geological Journal, 54 (4) 2084-2098 doi:10.1002/gj.3285 | Journal (article/letter/editorial) | | preliminarily attributed to a carnivorous non‐therapsid synapsid were described from a second site, approximately...one of the few examples in the Permian of Europe of a combined ichno‐ and body‐fossil record. The tracks...the excavation site, and a reddish sandstone slab bearing a large remains of a huge caseid synapsid (Ronchi...Maganuco, tracks yielded two joined loose slabs from a very close horizon to & Nicosia, 2017). The second...ichnological find remains, temporarily ascribed to a meat‐eating synapsid (Romano et al., from the Permian |  | | Journal (article/letter/editorial) | | Abstract—The paper is devoted to the solution of a reverse problem: reproducing the zoning of ore mineral...according to a model for geochemical zoning during early exploration phases. The model provides a basis for...the erosion level of ore mineralization based on a single section through an orehosting geochemical...the average concentrations of indicator elements of a given mineralization type. The application of the...of ore mineralization as a whole and the affiliation of a given section with a certain level of the ore |
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