Chovan M., Jágerský I., Delaney V., Žitňan P., Kubač A., Bačík P., Troppová D. & Mikuš T. , 2016: Mineralogy of ore dressing products from Banská Hodruša Au (Ag, Pb, Cu) epithermal deposit. Acta Geologica Slovaca, 8, 2, 203–216.


Mineralogy of ore dressing products from Banská Hodruša Au (Ag, Pb, Cu) epithermal deposit

Martin Chovan1, Ivan Jágerský2, Vivien Delaney3, Peter Žitňan2, Alexander Kubač4, Peter Bačík1, Danka Troppová5 & Tomáš Mikuš5

1Department of Mineralogy and Petrology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia; chovan@fns.uniba.sk
2Slovenská Banská Ltd., 966 61 Hodruša-Hámre, Slovakia
3SGS Canada Inc., P.O. Box 4300, 185 Concession Street, Lakefield, Ontario, Canada
4Department of Economic Geology, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
5Earth Science Institute of Slovak Academy of Sciences, Ďumbierska 1, 974 01 Banská Bystrica, Slovakia

Abstract

Gold–sulphide ore from epithermal vein deposit Banská Hodruša consists of gold, electrum, galena, sphalerite, chalcopyrite, and pyrite. Minor amounts of tellurides are present in the form of hessite, petzite and other rare Au sulphides and tellurides. Pyrite as a common product of hydrothermal alteration occurs mainly in the wall rock. Gangue minerals are represented by abundant quartz and adularia, clay minerals and carbonates. A combination of classical mineralogical methods – optical microscopy, electron microprobe, scanning electron microscopy, powder X-ray diffraction, automated mineralogy methods – QUEMSCAN RMS, TMS, PMA, and chemical analysis were used to determine composition of the head sample and individual ore dressing products, such as mineral jig concentrate, flotation concentrate and waste. The information about mineral composition of head sample, distribution of minerals in ore dressing products, their chemical composition and optimal grain size (P85–88 of 74 μm) has been determined. The concentrate contains approx. 15 % of gangue minerals and approximately 2.5 % of the waste consists of sulphides. The mineral associations and mineral intergrowns has been studied. Gold is liberated well, with more than 70 % of gold being liberated and amenable to flotation, the rest associated with complex mineral assemblages (18 %), silicates and carbonates (9 %) and sulphides (~3 %). Liberation of sulphides is better than 83 %. The ore has excellent metallurgical properties, maximum achievable gold recovery by flotation is 96–98 %. Results of the study provided information to optimize ore dressing processes, particularly quality of milling, effectiveness of flotation process and gravity circuit.


Key words: epithermal mineralization, flotation, gold recovery, grain size, association, liberation


Manuscript received: 2016-08-24

Revised version accepted: 2016-10-10


PDF fileBibTex fileRIS fileXML file


Information

Forthcoming articles

AGEOS 2016, Vol. 8, Issue 2

Archive

Visitors

  • Total: 82321
  • This year: 3703
  • This month: 992
  • This week: 99