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Epithermal Gold Deposits

  • GOLD IN NEVADA: A SPECTRUM OF DEPOSITS IN A COMPLEX FRAMEWORK
    Nevada holds the greatest concentration of gold deposits in North America. Virtually every known type of mineralisation is represented, from relatively deep mesothermal veins and porphyry systems to paleosurface-related hot spring systems.

    John Thompson is a senior geologist with 14 years in the industry. He is presently working with Kennecott Exploration in Utah.

  • CURRENT GEOLOGIC RESEARCH AND DEEP GOLD DEPOSITS FO THE CARLIN TREND
    Recent discoveries and on-going research on the origin and evolution of the deposits along the Carlin Trend in Northeast Nevada suggest a re-evaluation of the conventional theories of its structure. New modelling may lead to more successful exploration of this productive region.

    C. Zimmerman, NEL, Nevada.

  • MCLAUGHLIN MINE, CALIFORNIA: AN UPDATE
    Considered a premier model of a hot spring-type epithermal precious metal system clearly displaying typical characteristics of its class. Located in the Coast Ranges, 120 km. north of San Francisco. Concise model shown in presentation.

    Norman Lehrman is with Homestake Mining Company.

  • GOLD DEPOSITS OF THE KETTLE RIVER PROJECT, NORTHEAST WASHINGTON
    The Kettle Deposit is a classic tertiary epithermal vein system similar to the near-by historic Republic district in Northeast Washington. Slides display the stratigraphy of this classic example and other nearby occurrences.

    Walter Hunt is the Chief Geologist of the Kettle River Operations for Echo Bay Exploration Inc.

  • VEIN AND WALL-ROCK GEOCHEMICAL ZONING: REPUBLIC MINING DISTRICT, WASHINGTON
    A study in the Republic District, Northcentral Washington, showing that wall-rock analysis can predict vein proximity, but wall-rock competency and hanging wall vs. footwall influence geochemical patterns.

    Eric Braun is a mining consultant from Missoula, Montana.

  • GOLD DEPOSITS IN THE ISKUT-STIKINE, NORTHWESTERN BRITISH COLUMBIA
    Porphyry Cu-Au, mesothermal shear vein, breccia systems and a variety of epithermal systems are presented by eight major mineral deposits in the Iskut-Stikine. Slides highlight late-stage epithermal mineralisation at the Eskay Creek camp.

    Ron Britten is with Homestake Mineral Development Company, Vancouver, British Columbia.

  • STRATIGRAPHIC AND STRUCTURAL SETTING OF THE SHASTA AU-AG DEPOSIT, NORTHCENTRAL BRITISH COLUMBIA
    The Shasta stockwork deposit is a precious metal quartz-carbonate-sulfide stockwork system hosted by Lower to Middle Jurassic Toodoggonne volcanics that erupted in a subaerial continental back-arc setting. Local geology is illustrated with color slides.

    Henry Marsden is with the Department of Earth Sciences, Carlton, Ottawa.

  • ACID-SULFATE GOLD-SILVER DEPOSITS IN THE GREATER ANTILLES ISLAND ARC
    Slides illustrate several of the acid-sulfate deposits in the Greater Antilles such as the largest in the Pueblo Viejo district in the Dominican Republic, Southeastern Puerto Rico and the Virgin Islands. Geochemical models and mineralisation are highlighted.

    Stephen E. Kesler, Department of Geological Sciences, University of Michigan.

  • CANCAN: AN EPITHERMAL ACID-SULFATE AU-AG DEPOSIT, MARICUNGA DISTRICT, CHILE
    The CanCan gold-silver Deposit is an acid-sulfate type of epithermal deposit in the maricunga district, a recently discovered tertiary volcanic-related epithermal series in the Northcentral Andes of Chile.

    L.A. Dick of Chevron Minera Chile, Santiago, Chile

  • THE MARTE AND LOBO GOLD DEPOSITS, CHILE
    The Marte and Lobo gold deposits are in the Maricunga district in the Northeast Andes of Chile. Slides depict the geology, geography and mineralisation of these deposits first discovered in 1981 by an aerial survey of colour anomalies related to hydrothermal alterations.

    Fred Gill of Cominco Resources International Ltd.

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