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Investigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece)

1
Department of Geology and Geoenvironment, National and Kapodistrian University of Athens, Zografou Campus, 15784 Athens, Greece
2
Hellas GOLD S.A., V. Sofias 23A Av., 10674 Athens & 63082 Stratoni, Chalkidiki, Greece
3
Department of Earth Sciences, Università degli Studi di Milano, via Botticelli n.23, 20133 Milano, Italy
4
Department of Physics, Aristotle University of Thessaloniki, University Campus, 54124 Thessaloniki, Greece
*
Author to whom correspondence should be addressed.
Geosciences 2019, 9(4), 164; https://doi.org/10.3390/geosciences9040164
Received: 10 January 2019 / Revised: 2 April 2019 / Accepted: 3 April 2019 / Published: 9 April 2019
(This article belongs to the Special Issue Magmatic-Hydrothermal Ore Deposits)
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Abstract

Pyrite/arsenopyrite (Py-AsPy), galena (PbS), and sphalerite (ZnS) concentrates from the flotation plants of Olympias and Stratoni (Kassandra mines, Chalkidiki, N. Greece) were investigated for their major, trace, minor, and critical element contents, including actinides associated to natural radioactivity. It is revealed that in addition to the Pb, Zn, Ag, and Au being exploited by Hellas Gold S.A., there are also significant concentrations of Sb and Ga (Sb: >0.2 wt.% in PbS concentrate; Ga:25 ppm in ZnS concentrate), but no considerable contents of Bi, Co, V, or REE. Concerning other elements, As was found in elevated concentrations (>1 wt.% in Py-(As)Py-AsPy Olympias concentrate and almost 1 wt.% in Stratoni PbS and ZnS concentrates) together with Cd (specifically in ZnS concentrate). However, actinides occurred in very low concentrations (U < 2 ppm and Th < 0.5 ppm in all examined concentrates), limiting the possibility of natural radioactivity in the Hellas Gold S.A. products. The concentrations of the natural radionuclides (238U, 232Th, and 40K) are much lower than those of commercial granitic rocks, and thus the associated radioactive dose is insignificant. View Full-Text
Keywords: Kassandra mines; Chalkidiki; sulfide ores; flotation concentrates; critical elements; actinides Kassandra mines; Chalkidiki; sulfide ores; flotation concentrates; critical elements; actinides
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Tzamos, E.; Papadopoulos, A.; Grieco, G.; Stoulos, S.; Bussolesi, M.; Daftsis, E.; Vagli, E.; Dimitriadis, D.; Godelitsas, A. Investigation of Trace and Critical Elements (Including Actinides) in Flotation Sulphide Concentrates of Kassandra Mines (Chalkidiki, Greece). Geosciences 2019, 9, 164.

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