Precious Metals in the Northern Cordillera PDF Download
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Author: Geological Association of Canada. Cordilleran Section Publisher: Rexdale, Ont. : Association of Exploration Geochemists ISBN: Category : Geochemical prospecting Languages : en Pages : 232
Book Description
Contains 13 of 31 technical papers presented at the Symposium. Includes papers on gold, silver and platinum metal deposits, exploration criteria for gold deposits, element distribution in gold-silver deposits, etc.
Author: Geological Association of Canada. Cordilleran Section Publisher: Rexdale, Ont. : Association of Exploration Geochemists ISBN: Category : Geochemical prospecting Languages : en Pages : 232
Book Description
Contains 13 of 31 technical papers presented at the Symposium. Includes papers on gold, silver and platinum metal deposits, exploration criteria for gold deposits, element distribution in gold-silver deposits, etc.
Author: D. Scott Stevens Publisher: ISBN: Category : Igneous rocks Languages : en Pages : 132
Book Description
"Alkaline igneous rocks are the source, and host, of variety of mineral deposits in the North American Cordillera. These include: (1) epithermal Au deposits, (2) porphyry Cu deposits with significant concentrations of Ag, Pt, and Au metals, and (3) exhalative precious-metal deposits. I have used a computer data-base, ALKY, of published and unpublished major oxide and trace element analyses of alkaline rocks in the Cordillera. These data were used to evaluate and propose classification schemes, genetic models, and geochemical fingerprints for precious metal deposits associated with alkaline rocks. Alkaline rocks were emplaced in continental rift, extensional, and back arc spreading settings of the Cordillera. Gold deposits associated with alkaline rocks occur in exhalative, stock, caldera, high level intrusive, and vent environments. Mineralized hosts include: felsic syenites, altered mafic syenites, and carbonatitic rocks. Chemical attributes of alkaline rock-related gold deposits include: SiO2>45 wt% (unless CO2>5 wt%), Na2OK2O, high total alkalis (Na2O+K2O10 wt%), Fe2O3>FeO, MgO
Author: Geological Association of Canada. Cordilleran Section
Author: Geological Association of Canada. Cordilleran Section
Author: 
Author: A.A. Levinson
Author: Association of Exploration Geochemists
Author: Charles Whittlesey
Author: James A. Erdman
Author: Cha's Whittlesey
Author: Charles Whittlesey
Author: D. Scott Stevens
Author: Joseph V. Tingley