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Gold mineralogy at the Aitik Cu–Au–Ag deposit, Gällivare area, northern Sweden
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0003-4711-7671
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Geosciences and Environmental Engineering.ORCID iD: 0000-0002-0935-3430
2011 (English)In: GFF, ISSN 1103-5897, E-ISSN 2000-0863, Vol. 133, no 1-2, p. 19-30Article in journal (Refereed) Published
Abstract [en]

The low-grade Aitik Cu-Au-Ag deposit is a deformed and metamorphosed porphyry-type deposit, and as such it belongs to the group of ores that require detailed mineralogical investigations of precious metal occurrences to assist in determining the recovery processes. The character of gold in the Aitik deposit varies substantially. Gold alloys display highly variable Au/(Au + Ag) ratios, and Hg is commonly a constituent. A change from dominantly sulphide-associated to groundmass-associated gold as mining progresses towards depth is accompanied by a change in the chemical composition of gold. Towards depth, the gold content in electrum and amalgam decreases (from c. 66 to 22% in electrum and c. 23 to 4% in amalgam), and the amount of native gold grains increases. The most common mineral assemblage associated with gold at deep levels (600m and below) is K-feldspar, biotite, plagioclase, quartz, chalcopyrite and pyrite. This study demonstrates that magmatic-hydrothermal and metamorphic processes responsible for the diversity in copper mineralisation styles within the Aitik ore body probably have also played a role in the variable character of gold observed at Aitik today

Place, publisher, year, edition, pages
2011. Vol. 133, no 1-2, p. 19-30
National Category
Geology
Research subject
Ore Geology
Identifiers
URN: urn:nbn:se:ltu:diva-2597DOI: 10.1080/11035897.2010.551542ISI: 000299034800003Scopus ID: 2-s2.0-80052415880Local ID: 03b3c705-8f20-4468-b7c5-d00080a74bd7OAI: oai:DiVA.org:ltu-2597DiVA, id: diva2:975450
Note
Validerad; 2011; 20110927 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Sammelin, MonikaWanhainen, ChristinaMartinsson, Olof

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