The composition of gold in the Cerro Casale gold-rich porphyry deposit, Maricunga Belt, northern Chile

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doi: 10.2113/gscanmin.39.3.907
Authors:Palacios, C.; Hérail, G.; Townley, B.; Maksaev, V.; Sepulveda, F.; de Parseval, P.; Rivas, P.; Lahsen, A.; Parada, M. A.
Author Affiliations:Primary:
Unversidad de Chile, Department of Geology, Santiago, Chile
Other:
Université Paul Sabatier, France
Volume Title:Canadian Mineralogist
Source:The Canadian Mineralogist, Vol.39(Part 3), p.907-915. Publisher: Mineralogical Association of Canada, Ottawa, ON, Canada. ISSN: 0008-4476
Publication Date:2001
Note:In English with French summary. 22 refs.; illus., incl. table
Summary:The Cerro-Casale Au-rich orebody is a Miocene deposit hosted in diorite and granodiorite porphyries. Two broad types of hypogene alteration are associated with the Au mineralization: potassic and white mica. EPMA results are reported for 176 gold grains from 29 samples collected from diamond drill-cores. The gold crystals deposited during potassic alteration have 8-28 wt.% Ag and low Cu (≤ 0.24 wt.%). Gold crystals deposited during white mica alteration, however, have lower Ag (1-9 wt.%) and higher Cu (0.06-0.34 wt.%). Gold crystals recovered from fragments of both porphyries included in a white mica hydrothermal breccia apparently retain their original Ag and Cu concentrations. [R.A.H.]
Sections:Mineral data
Subsections:Non-silicates
Subjects:Breccia; Chemical composition; Concentration; Copper ores; Crystals; Geochemistry; Gold; Gold ores; Hydrothermal alteration; Hydrothermal conditions; Igneous rocks; Metal ores; Metals; Metasomatism; Mica group; Mineral composition; Mineralization; Muscovite; Petrography; Porphyry; Porphyry copper; Sheet silicates; Silicates; Chile; South America; Cerro Casale Deposit; Maricunga Belt; Northern Chile
Abstract Numbers:02M/808
Record ID:2002023719
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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