Geochemical analysis and modelling of the weathering profile at the Las Cristinas Gold - Copper Deposit, Venezuela

Marcus John Willson

    Research output: ThesisMaster's Thesis

    11 Downloads (Pure)

    Abstract

    [Truncated] The Las Cristinas Deposit is six kilometres to the southwest of km 88 in the Guayana Shield, Estado Bolivar, Venezuela, and has been extensively mined for gold since before World War II. The deposit has reserves of 270 million tonnes at an average grade of 1.1 g/t Au and 0.12% Cu. The deposit is hosted within Early-Proterozoic greenschist metamorphosed eugeosynclinal metavolcanicand metasedimentary rocks, comprised of andesitic to rhyolitic metatuffaceous units which have been intruded by diorite and aplite dykes and small scale diorite intrusive bodies. This work investigates the weathering habit of the copper-gold mineralised system in the Mesones deposit,within the main Las Cristinas Deposit area. A large central portion is dominated by tourmaline breccia with silicification, interpreted to be related to a maar type diatreme in a VHMS environment. Three phases of primary alteration have taken place in the deposit as follows: (1) quartz-sericite-pyrite-tourmaline (QSP); (2) secondary biotite, and (3) carbonate. Gold is associated with the QSP and carbonate events and copper mineralisation is associated with the carbonate event.
    Original languageEnglish
    QualificationMasters
    Awarding Institution
    • The University of Western Australia
    DOIs
    Publication statusUnpublished - 1998

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