Beneficiation study of the Osikonmaki refractory-type gold ore at Rantasalmi, southeastern Finland

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Authors:Leppinen, Jaakko; Kontoniemi, Olavi
Author Affiliations:Primary:
VTT Chem. Technol., Outokumpu, Finland
Volume Title:Geological setting and characteristics of the tonalite-hosted Paleoproterozoic gold deposit at Osikonmaki, Rantasalmi, southeastern Finland
Volume Authors:Kontoniemi, Olavi, editor; Nurmi, Pekka A.
Source:Geological setting and characteristics of the tonalite-hosted Paleoproterozoic gold deposit at Osikonmaki, Rantasalmi, southeastern Finland, edited by Olavi Kontoniemi and Pekka A. Nurmi. Special Paper - Geological Survey of Finland, Vol.25, p.101-110. Publisher: Geologian Tutkimuskeskus, Espoo, Finland. ISSN: 0782-8535. ISBN: 951-690-708-3
Publication Date:1998
Note:In English
Summary:Osikonmäki is a Palaeoproterozoic, epigenetic, tonalite-hosted and shear-zone related Au deposit. The ore minerals pyrrhotite, arsenopyrite, löllingite and chalcopyrite, and the sphalerite, galena and ilmenite or rutile accessories, occur as uneven or banded disseminations throughout the ∼ three km-long shear zone. Gold or electrum, and associated minerals, occur as inclusions both in and on the grain boundaries of sulphide, arsenide and silicate phases. The most common associated minerals are native Bi, hedleyite and ikunolite. Beneficiation studies were carried out on a composite sample made from three subsamples taken from the study pit. Froth-flotation, cyanide leaching and P oxidation were used to test Au recovery from the ore. In conventional bulk-floation, Au recovery was only 70%, with 10-25% As in the bulk concentrate, although sulphides and arsenides were almost completely recovered. Depending on the grinding fineness, the maximum recovery of Au by cyanide leaching was 75-80%. Pressure oxidation increased Au recovery from the cyanide leaching by 10-25%, the maximum recovery then being ∼ 93%. Conventional processes may not provide satisfactory Au recovery, or acceptable As content, and therefore, more sophisticated technologies and/or new process options must be considered for processing the Osikonmäki ore. [J.F.]
Sections:Economic minerals and ore deposits
Subsections:Metallic deposits: regional
Subjects:Beneficiation; Flotation; Gold ores; Leaching; Metal ores; Ore minerals; Oxidation; Paleoproterozoic; Precambrian; Production; Proterozoic; Upper Precambrian; Europe; Finland; Scandinavia; Western Europe; Eastern Finland Province; Etela-Savo Finland; Osikonmaki Deposit; Rantasalmi Finland; Southeastern Finland
Abstract Numbers:99M/1413
Record ID:1998069139
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from FINGEO, Geological Survey of Finland
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