Prospectivity mapping for multi-stage epithermal gold mineralization in Argentina

Ford, Arianne, Hagemann, Steffen, Miller, John, Fogliata, Ana, Mol, Augusto, and Sotarello, Gustavo (2012) Prospectivity mapping for multi-stage epithermal gold mineralization in Argentina. In: Abstracts from the 34th International Geological Congress. p. 797. From: IGC 2012: 34th International Geological Congress, 5-10 August 2012, Brisbane, QLD, Australia.

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Three distinct periods of epithermal-style Au-Ag mineralization are defined in Argentina. A low sulfidation epithermal mineralization event in the Permo-Triassic occurred along the eastern margin of the Cordillera Frontal in the San Juan province, which hosts among others the Casposo Au-Ag deposit. A further low sulfidation event during the Jurassic has been documented, eg. In the Deseado Massif in southern Patagonia, which hosts the Cerro Vanguardia Au-Ag deposit. A high sulfidation epithermal event in the Miocene is observed in the El Indio belt in the Cordillera Principal which hosts the Pascua-Lama and Veladero Au-Ag-Cu deposits.

During all three periods the epithermal mineralization is hosted in felsic to intermediate volcanic units and is structurally controlled at the mine or camp scale, with a preferred structural orientation within each mineral district. However, there is no overall preferred orientation when comparing the different districts.

From the publicly available 1:2,500,000 digital geology map of Argentina, all felsic to intermediate volcanic units of Permo-Triassic, Jurassic and Miocene age were extracted. Utilizing a gravity map, new large-scale structures were interpreted. Using both public data and new interpretations, a prospectivity map for epithermal-style Au-Ag mineralization was generated for Argentina using the conceptual Fuzzy Logic method. The prospectivity map produced was validated by its ability to predict known areas of Au-Ag mineralization.

Item ID: 40040
Item Type: Conference Item (Abstract / Summary)
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Date Deposited: 03 Sep 2015 01:16
FoR Codes: 04 EARTH SCIENCES > 0403 Geology > 040399 Geology not elsewhere classified @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840105 Precious (Noble) Metal Ore Exploration @ 100%
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