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Hydrothermal alteration of chevkinite: insights from natural rocks and experiments

Macdonald Ray, Bagiński Bogusław

Acta Geologica Polonica

2022

Vol. 72, no. 4

413--421

The contributions of the members of the Department of Geochemistry, Mineralogy and Petrology, University of Warsaw, to the study of the chevkinite-group of minerals (CGM) are described. The range of research topics includes: (i) geochemical and mineralogical studies of natural occurrences of the group, and attempts to relate their chemical composition to host lithology; (ii) detailed analysis of the hydrothermal alteration of CGM in various settings, with the aim of understanding element redistribution and the potential implications for ore formation. An ongoing series of high P-T experiments is providing quantitative information on the pressures, temperatures and melt water conditions under which the alteration assemblages have formed. Various spectroscopic techniques are being used to determine the structure of the CGM and to identify cation distribution in the structures.

Porfirowe złoże Cu-Mo-(Au) Sierra Gorda : inwestycja KGHM Polska Miedź S.A. w Chile

Bieńko T.

Przegląd Geologiczny

2017

Vol. 65, nr 9

555--559

Porphyry deposits host the most of world’s indicated Cu and Mo resources and are major sources of critical metals including Au, Ag, PGE, W and Re. The Sierra Gorda Paleocene-Eocene Cu-Mo deposit, located on the Atacama Desert in Northern Chile, can be identified as porphyry-type in terms of contained metals (Cu grade less than 0.5%, Mo grade up to 0.02%), mineralization (disseminated or stockwerk vein-hosted hypogene sulphides), structural controls (stockwerks and hydrothermal breccia bodies), and genetic relation to an intermediate calc-alkaline intrusion (monzodiorite intrusion in volcanic country rocks). Three main centres of mineralization are associated with the intrusive body and genetically connected with spatially evolved hydrothermal alteration. With target annual production of 220 k tones of Cu and 55 k tones of Mo, Sierra Gorda is the largest open-pit project of the major Polish metal mining company KGHM Polska Miedź.