81. Geochemistry Economic Geology Pacific Ocean Geology And Palaeontology Epithermal Geochemistry Economic geology Pacific Ocean geology and PalaeontologyEpithermal gold Mineralization of the CircumPacific JW Hedenquist. http://www.lyricsbox.co.uk/J-W-Hedenquist-Epithermal-Gold-Mineraliz-0444886745.h

Geochemistry Economic geology Pacific Ocean Geology and Palaeontology Epithermal Gold Mineralization of the Circum-Pacific J W Hedenquist Subject: Geochemistry Economic geology Pacific Ocean Geology and Palaeontology Title: Epithermal Gold Mineralization of the Circum-Pacific Author: J W Hedenquist J M Verweij Hydrocarbon Migrat... E S Parilis Atomic Collisions ... Stanley N Deming Experimental ... G Bailly Talking Machines... ... Jammers Antonius, Klemp Egon...

82. GSA 1999b - Geology Of The Metates Pyrite-Arsenopyrite-Gold-Silver Deposit, Dura Greenhoot, CA, Friehauf, KC, and Barton, MD, 1999 , geology of the Metates PyriteArsenopyrite-gold-SilverDeposit, Durango, Mexico abs. Geol. Soc. http://faculty.kutztown.edu/friehauf/cv/abstracts/gsa-99b.htm

Greenhoot, C.A., Friehauf, K.C., and Barton, M.D., 1999 , Geology of the Metates Pyrite-Arsenopyrite-Gold-Silver Deposit, Durango, Mexico [abs.]: Geol. Soc. America Abstracts with Programs, v. 31, no. 7, p. A406. GREENHOOT, C.A., FRIEHAUF, K.C., and BARTON, M.D., Dept. of Geosciences, University of Arizona, Tucson, AZ 85721 The Metates gold deposit in northwest Durango, Mexico, contains over 800 million metric tons of mineralized rock (0.62 ppm Au, 15 ppm Ag, 0.2% Zn) hosted by a quartz latite body and enclosing marine clastic sedimentary package. Mineralization is spatially related to an Early- Cretaceous concordant body of porphyritic quartz latite (107 Ma, U/Pb). The enclosing 500 m sequence of dark shales (argillites), greywackes and conglomerates may represent marine turbidites deposited in a back-arc basin. Mesozoic rocks are deformed and unconformably overlain by unmineralized Tertiary volcanics. The latite body strikes northwest for more than a kilometer, and dips 30 degrees northeast; maximum thickness is about 300 meters. Massive latite is overlain by a heterolithic breccia, characterized by igneous and sedimentary matrix alternating at meter scale. Bedding within 20 meters of the upper and lower contacts is sheared and contorted. Contact metamorphism is absent. The latite may be a shallow syn-sedimentary sill, with peperite at the upper contact. Alternatively, the breccia may represent a debris flow overlying a submarine latite flow or dome. Syngenetic lamellae of framboidal pyrite are present within the sedimentary rocks. Epigenetic veins include: (1) pyrite +/- chalcopyrite; (2) pyrite- arsenopyrite- +/- quartz +/- chalcopyrite; (3) sphalerite- pyrite- galena- siderite- quartz; and (4) quartz- pyrite +/- sphalerite. Sulfur isotope data suggest a magmatic sulfur source for vein sulfides. A magmatic fluid component is compatible with moderate salinity fluid inclusions (>5 wt % NaCl eq), and pervasive alteration of the quartz latite to sericite- quartz- pyrite. Pervasive silicification is common, but veins are nearly free of silicate minerals. Alteration in the sheet-silicate-rich sedimentary units presents as replacement of clays and feldspars by sericite.

83. GEOLOGY OF THE RAUL-CONDESTABLE IRON OXIDE-COPPER-GOLD DEPOSIT, CENTRAL COAST OF Paper No. 530. geology OF THE RAUL-CONDESTABLE IRON OXIDE-COPPER-GOLDDEPOSIT, CENTRAL COAST OF PERU. DE HALLER, Antoine, Mineralogy http://gsa.confex.com/gsa/2001AM/finalprogram/abstract_25106.htm

Paper No. 53-0 GEOLOGY OF THE RAUL-CONDESTABLE IRON OXIDE-COPPER-GOLD DEPOSIT, CENTRAL COAST OF PERU DE HALLER, Antoine , Mineralogy Department, University of Geneva, rue des Maraîchers 13, Genève 4, CH-1211, Switzerland, Antoine.dehaller@terre.unige.ch, ZUÑIGA ALVARADO, Julio, Geology department, Cía. Minera Condestable S.A, Calle Manuel Roaud y Paz Soldán 364, San Isidro, Lima, 27, Peru, and FONTBOTÉ, Lluís, Mineralogy Department, Univ of Geneva, Rue des Maraîchers 13, Genève 4, 1211, Switzerland Mineralization is predated by andesite-dacite porphyritic dikes and sills followed by a small granodiorite stock which is cut by dolerite dikes in originally subvertical fractures that grossly follow the NNW Andean trend. Most of the ore replaces porous (tuffs, volcanic breccias) or chemically reactive (limestone) beds and was generated by hydrothermal fluids flowing laterally from NE and NW trending veins. GSA Annual Meeting, November 5-8, 2001 General Information for this Meeting Session No. 53 Economic Geology I: Fe-oxide(-Cu-Au) Deposits, Fe-Sulfides in Black Shales, Taconite Ores, Geochronology

84. Geology Of Lihir Island, Papua New Guinea Lihir Island and the Ladolam gold Deposit. Lihir Island is 15 km longx 10 km wide. Volcanic features Ladolam gold Deposit. Luise caldera http://www.syd.dem.csiro.au/research/hydrothermal/brent/Lihir.html

Ore Formation Processes Group Cu-Au Home People Projects Lihir Island and the Ladolam Gold Deposit Lihir Island is 15 km long x 10 km wide. Volcanic features include the Kunami, Huniho and Luise volcanoes. Both Kunami and Luise have suffered sector collapse due to gravitational instability as the slopes became unsupported due to their relatively rapid growth. The youngest volcanic feature is the Luise caldera (center right) formed about 1 Ma. The Luise Caldera hosts the giant Ladolam gold deposit. This image used by permission of the Lihir Mining Co. Ltd. Click here for a 260K JPEG version. Recent Publication Relating to Lihir Now Available Free from SCIENCE Online Osmium Isotope Constraints on Ore Metal Recycling in Subduction Zones Brent I.A. McInnes, Jannene S. McBride, Noreen J. Evans, David D. Lambert and Anita S. Andrew SCIENCE 286, 512-516, October 15, 1999 issue Download abstract Download full text Ladolam Gold Deposit Luise caldera is 3 x 5.5 km in diameter and hosts an active geothermal field and one of the world's largest and youngest deposits of gold (43 million ounces). The gold deposit named Ladolam, was discovered in 1982. The deposit contains 600 tonnes of Au in the upper 300m of the deposit. This is approximately 3 times the amount of gold extracted from the California Motherlode and placer operations combined. Biogeochemical surveys over the Ladolam deposit.

85. Department Of Geological Sciences, U Of M CM, Kesler, SE, Simon, G. and Fortuna, J., 2000, Overlapping Cretaceous and EoceneAlteration, Twin Creeks Carlintype gold Deposit, Nevada Economic geology. http://www.geo.lsa.umich.edu/dept/faculty/kesler/

Stephen E. Kesler Professor Ph.D., Stanford University, 1966 Economic Geology, Exploration Geochemistry, Environmental Geochemistry Geological Sciences University of Michigan 2534 C.C. Little Building, 425 E. University Ave. Ann Arbor, MI 48109-1063 Voice: 734 764-5057; Fax: 734-763-4690 Email: skesler@umich.edu Search Sponsored Research Database ( hints Research Interests Geology and geochemistry of ore deposits, mineral exploration and economics, environmental geochemistry related to the recovery and use of minerals, and the regional geology of the Caribbean region, Central America and Mexico, especially as it relates to the origin and evolution of mineral deposits in this area. Special attention has been given recently to porphyry copper deposits, Carlin-Type micron gold deposits, chimney-manto lead-zinc-silver, and Fe-oxide deposits, as well as the use of fluid inclusion gases and stable isotopes in mineral exploration. Selected Publications Kesler, S.E., 1994, Mineral Resources, Economics and the Environment: Macmillan, 391 p.

86. Yukon Geology Program-Field Projects- Mineral Deposits constraints and Structural controls on graniteemplacement and associated mineralizationin Tombstone gold Belt Julian Stephens, Economic geology Research Unit http://www.geology.gov.yk.ca/projects/mindep.html

Last modified on: June 18/02 Mineral Deposits Tombstone Gold Belt Yukon Volcanogenic Associated Massive Sulphides Dawson Range Metallogeny PGE Potential in Yukon Tombstone Gold Belt in Yukon Craig Hart Yukon Geology Program Since 1991 gold exploration in Yukon has become increasingly focused on intrusion-related gold systems associated with Tombstone plutonic suite intrusions, mainly as a result of discoveries and production from the Fort Knox mine in Alaska and the Brewery Creek mine in Yukon. Exploration was further catalysed by the discovery of the Pogo deposit and the knowledge of its association with Cretaceous plutons. In the past decade, approximately $150 million dollars has been expended on Yukon gold exploration. Yukon's Cretaceous plutonic suites were previously recognized for their associated tungsten, copper, and tin occurrences. Occurrences of silver-lead (Keno Hill, Plata) were assumed to be associated with the plutons. More recently, gold and emerald occurrences have been discovered in associations with the granitoids, thus making these rocks prodigious mineralizers. In addition to Brewery Creek, Dublin Gulch, Scheelite Dome and Clear Creek are among the larger and better explored systems, and are more strongly associated with the 93 ± 1 Ma Tombstone Plutonic Suite which spans 700 km across Yukon.

87. Hope Mining Company, History & Geology geology. According to the US.Geological Survey the gold in the placer depositsin the Resurrection Creek Drainage originated in quartz veins and igneous http://www.hopemining.com/handg.html

Mission Statement Map Adventure Leasing Long Term ... Home Reservations, availability and pricing information, contact: Hope Mining Company Inc. PO Box 101827 Anchorage AK 99510 (phone/fax/message) E-mail: red@hopemining.com var site="sm2hopemine" document.write("//"+"-"+"-"+">"); Resurrection Creek Geology According to the U.S.Geological Survey the gold in the placer deposits in the Resurrection Creek Drainage originated in quartz veins and igneous intrusions in the slates and graywackes of the surrounding Kenai Mountains. These rocks are of the Cretaceous period and assigned to the Valdez Group. A formation which hosts numerous lode and placer gold deposits. The Valdez Group stretches from Kodiak Island to the south side of the Alaska Mountain Range. The broad U shaped valleys of the Kenai Mountains were subjected to alpine glaciation in Quaternary time. The large prominent benches along Resurrection Creek consist of material deposited in a short period at the end of the regions last glaciation. These sediments consist of mostly un-stratified and poorly sorted sand and gravel with a few boulders dispersed in it. Because of the rapid deposition the eroded gold was not concentrated, but was distributed throughout the material. A subsequent drop in relative sea level resulted in streams cutting down into the post glacial gravels to form the present valleys, in the process reworking the gravels and concentrating the gold. On some of the Hope Mining Company properties the gold concentrations are related to a "false bed rock" of yellow-gray glacial clay. This clay layer is of varying thickness and overlays unsorted gravel of relatively the same age and composition. Above the clay layer is a well sorted Quaternary gravel with huge boulders siting right on the clay. Gold occurs throughout the gravel above the clay layer, but the highest pay is in the eighteen inches just above the clay. As you would expect under a big boulder on the clay is found the best gold.

88. MERIDIAN GOLD INC. - Operations & Exploration (Rossi - Geology) http://www.meridiangold.com/property/rogeology.html

89. South African Gold Reef Geology South African gold Reef geology. Although there were isolated reportsof alluvial gold and some quartz deposits in South Africa as http://info.goldavenue.com/Info_site/in_mine/in_min_sa_geol.htm

South African Gold Reef Geology Although there were isolated reports of alluvial gold and some quartz deposits in South Africa as early as 1853 (just after the Californian and Australian gold rushes ), the real discovery took place in February 1886, when George Harrison found an outcrop of the main reef of gold-bearing conglomerate on Langlaagte Farm near Johannesburg. Cutaway of the multi-layered gold bearing reefs of the Witwatersrand (Credit: courtesy The Chamber of Mines of South Africa) Ventersdorp Contract Reef Mondeor Conglomerate formation Kimberly Conglomerate formation Bird Conglomerate formation Livingstone Conglomerate formation Johnstone Conglomerate formation Main Conglomerate formation Crown Formation Veldschoen Reef (inner basin reef) Magnetic Horizon in in lower Jeppestown shale Buffelsdoorn (Outer Basin reef) Boulders Reef Magnetic shale in Witport Jie Formation Magnetic West Rand shales Rietfontein tillite The key difference between this field and the earlier Californian and Australian discoveries was that it was not an alluvial deposit which thousands of freelance gold diggers could work, but the tip of

90. Nevada Pacific Gold Ltd. - Geology Of Nevada - Sat Mar 22, 2003 geology of Nevada (PDF Format) File http//www.nevadapacificgold.com/i/pdf/geology_Nevada.pdf.Disclaimer Copyright © 2002, Nevada Pacific gold Ltd. http://www.nevadapacificgold.com/s/GeologyNevada.asp

Geology of Nevada (PDF Format) File: http://www.nevadapacificgold.com/i/pdf/Geology_Nevada.pdf

91. Geology 115 Welcome to geology 115! Your instructor is Richard Cowen and your TAis Jesse de carlo. WED APR 17, Ancient Silver and gold, CHAPTER 6. http://www-geology.ucdavis.edu/~gel115/

Welcome to Geology 115! Your instructor is Richard Cowen and your TA is Jesse de carlo What You Are About To Receive... Lecture Schedule (Tentative) The reason it's tentative is that we have FOUR sessions a week, one of them labelled "Discussion". If I can be flexible in my use of "discussion" time, so that we end up with 9 discussions, but not at the same time every week, then this alters the scheduling. We'll talk about that when classes start. Date Lecture Topic Chapter MON APR 1 Introduction (none) WED APR 3 The First Geologists: The Stone Age CHAPTER 1 FRI APR 5 The First Miners and Traders (in Geological Goods) CHAPTER 2 MON APR 8 Fire and Metals CHAPTER 3 WED APR 10 The Bronze Age CHAPTER 4 FRI APR 12 Bronze Age Myths and Legends MON APR 15 Iron and Steel CHAPTER 5 WED APR 17 Ancient Silver and Gold CHAPTER 6 FRI APR 19 Medieval Silver and Gold CHAPTER 7 MON APR 22 Gold and Silver: Spain and the New World CHAPTER 8 WED APR 24 Smiths CHAPTER 9 FRI APR 26 Cannon and politics CHAPTER 10 MON APR 29 Coal CHAPTER 11 WED MAY 1 The Burdens of Coal CHAPTER 12 FRI MAY 3 OPEC and Crude Oil CHAPTER 13 MON MAY 8 Cartels and Cans of Worms CHAPTER 14 WED MAY 10 Diamonds CHAPTER 15 FRI MAY 12 MIDTERM EXAM MON MAY 15 Firepower and Fertilizer CHAPTER 16 WED MAY 17 Ancient Irrigation CHAPTER 17 FRI MAY 19 Mining Ground Water CHAPTER 18 MON MAY 22 Water and Geopolitics: The Middle East CHAPTER XX WED MAY 24 Floods: the Yellow River CHAPTER XX FRI MAY 26 Deltas CHAPTER MON MAY 29 MEMORIAL DAY HOLIDAY WED MAY 31 Subsidence CHAPTER XX FRI JUN 2 CHAPTER MON JUN 5 Volcanoes: Active Intervention

92. Refiner Of Gold Creations Geology Refiner of gold Creations. Mt St Helens, Rocks, geology. Rocks maybe round, jagged, hard, or crumbly. Rocks are all around us every http://members.tdn.com/nwbhc/refiner/geology/rocks.htm

93. Chemistry : Periodic Table : Gold : Geological Information Goud, or, gold, oro, Ouro, oro, Guld. Notes. gold is found as the freeelement in nature and associated with quartz, pyrite and other minerals. http://www.webelements.com/webelements/elements/text/Au/geol.html

Chemistry: WebElements Periodic Table Professional Edition Gold : geological information Pro Home Scholar Home Books WebElements CD ... Help Goud or Gold oro Ouro oro Guld Online discussions index Index for gold background Key data; description History gold around us Uses Geology Biology gold compounds Reactions of gold Compounds Bond enthalpies Radii in compounds ... Reduction potentials electronic properties Electronic configuration Ionization energies Electron affinities Electronegativities ... Valence shell radii physical properties Bulk properties (density, resistivity, etc.) Thermal properties (melting point, etc.) Thermodynamic properties crystallography Crystal structure [view VR world] [view pdb image] nuclear properties NMR Naturally occurring isotopes Radioisotopes WebElements Drive traffic to your site by sponsoring gold WebElements online book store PalmElements for your Palm WapElements for your phone Acknowledgements Help About WebElements WebElements wall chart Sign the guest book FlashElements Search by keywords: Gold Au Geological information Abundances In this table values are given in units of ppb (parts per billion; 1 billion = 10

94. The Milwaukee Public Museum - Geology Section The successful test of the volcanic hot springs model was a breakthorough in goldexploration,a nd areas with similar geology are being actively explored http://www.mpm.edu/research/geology/gold_lore05.html

Visit Us Exhibits School Programs Humphrey IMAX Dome Theater Join Today Travel Programs Museum Shops Private Rentals Volunteer Work Opportunities anthropology botany geology history ... virtual reef Additional Information Search the Museum Contact Us Geology Section Gold Prospecting Gold Prospecting in the New West by Rodney Watkins, Curator of Geology High-grade gold ore from Colorado. such occurrences of visible gold flakes in quartz veins the dream of the old-time prospector are now so rare as to be economically negligible in western mining. Phot of museum speciment enlarged to show detail. F or most people, the mention of gold prospecting is likely to evoke an image of men in slouch hats and western garb, armed with goldpan, pick and shovel and accompanied by a trusty burro packed with supplies for several months in the wilderness. As we know from film and novels, these hardy fellows spend much of their lives combing the hills, for that vein of precious yellow metal which will make them rich. In reality, the modern western prospector typically works for a salary, discovery or not, and he is likely to wear a baseball cap with a company logo. He uses a four-wheel- drive vehicle instead of a burro, usually stays in motels, and his prospecting tools include topographic maps, a plastic garden trowel, cloth bags, compass and tape measure. Even more incongruously, the modern prospector almost never sees the gold he is searching for, even when his work result in a major discovery and the opening of a mine.

95. Consorminex;Quaternary Geology;heavy Minerals;kimberlite;diamond;gold;geochemist Translate this page CONSORMINEX INC. 11-1695, rue Atmec, Gatineau, Québec, Canada (819)669 2820, fax (819) 669 2775 GÉOLOGIE QUATERNAIRE, MINÉRAUX http://consorminex.com/frindex.htm

CONSORMINEX INC. 11-1695, rue Atmec, Gatineau, Québec, Canada (819) 669 2820, fax (819) 669 2775 GÉOLOGIE QUATERNAIRE, MINÉRAUX LOURDS et SERVICES EN EXPLORATION MINIÈRE Consorminex Inc. prélève, traite et analyse des échantillons de sédiment meubles depuis 1986. SERVICES OFFERTS ENGLISH cmx@consorminex.com Photomicrographies Page d'accueil ... English

96. MERIDIAN GOLD INC. - Operations & Exploration (Beartrack - Geology) http://www.meridiangold.com/property/begeology.html

97. Earth Science, Science Projects Mineral Specimens including Limestone, Obsidian, Pumice, Sulfur, and a Fool's Goldnugget! A complete geology study kit with a total of 47 different specimens http://www.infowest.com/life/projgeo.htm

Earch Science Projects: Ant Projects Geology Plant Projects Electricity Below are some of our science projects in one of our favorite areas, earth science. Learn how to identify rocks and minerals as a science project or learn about precious metals and how to find them in the field. We also have available many collections of rocks, minerals, fossils, and gems that can help you to have a successful science project. We hope you have as much fun with earth science projects as we do. Identifying rocks and minerals can be a great science project! Our Identifying Rocks Kit teaches you how. The kit includes 15 unidentified rocks and minerals that you must identify using various scientific tests. You will learn to identify rocks by their hardness, appearance, and unique physical properties. Rocks included are lodestone, sulfur, sandstone, volcanic scoria, pumice, gypsum, talc, obsidian, conglonmerate, coal, halite, selenite, quartz, calcite, and limestone. A great project at a great price order your Identifying Rocks Kit today. Item#...................................IDR

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