Journal : Acta Geologica Polonica
Article : Placer gold and other economic minerals from the remnants of palaeofan deposits in the foreland of the East Sudetes, Poland

Authors :
Rushton, A.
The Natural History Museum, Cromwell Road, London SW7 5BD, UK, A.Rushton@nhm.ac.uk,
Szrek, P.
Institute of Geology, Warsaw University, Żwirki i Wigury 93, PL-02-089 Warszawa, pszrek@poczta.onet.pl,
Konon, A.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland, konon@geo.uw.edu.pl,
Summesberger, H.
Naturhistorisches Museum Wien, Burgring 7, A-1010 Wien, Austria, herbert.summesberger@nhm-wien.ac.at,
Kennedy, W.
Geological Collections, Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, U.K., Jim.Kennedy@oum.ox.ac.uk,
Rubinkiewicz, J.
Institute of Geology, University of Warsaw, Żwirki i Wigury Str., 93 PL-02-089 Warszawa, Poland, Jacek.Rubinkiewicz@uw.edu.pl,
Bojanowski, M.
Faculty of Geology, University of Warsaw, Żwirki i Wigury Str. 93, PL-02-089 Warszawa, Poland, mcbojan@uw.edu.pl,
Wierchowiec, J.
Institute of Geology, University of Warsaw, Al. Żwirki i Wigury 93, PL-02-089 Warszawa, Poland, janzloz@geo.uw.edu.pl,
Abstract : Gold-bearing palaeofan deposits in the East Sudetic Foreland region are associated with the White Gravel series, which is the richest gold-bearing horizon. The remnants of the White Gravels in the vicinity of Gierałcice and Sławniowice contain between 0.33 g/m[^3] Au near the base and <0.05 g/m[^3] Au in the upper part. The gold is associated with other heavy minerals, such as Fe-Ti oxides (magnetite, ilmenite, and hematite), zircon and rutile. Concentration of these minerals increases significantly with depth and three-quarters of the total gold is found in the lower half of the palaeofan deposits. The alluvial palaeofan placers were formed by repeated scouring and reconcentration of resistant heavy minerals from a number of sources, including pre-existing placers and bedrock. The gold grains are composed of variable proportions of Au and Ag with trace amounts of Cu, Te and Se. Rims have high gold (>93 wt % Au) and low silver (<6 wt % Ag) contents, whereas cores contain average 85 wt % Au and 14 wt % Ag. Porous gold grains are homogeneous and of high purity (>95 wt % Au). The bedrock source of gold is probably related to quartz veins in Palaeozoic schist and quartzite. There are several local point sources of gold, mainly quartz veins of the Zlaty Chlum Massif. Data presented for the Gierałcice.Sławniowice palaeofan placers may be useful for prospecting and exploration for similar deposits.

Keywords : minerały ciężkie, Sudety Wschodnie, złoże, żwir, East Sudetes, Economic heavy minerals, Palaeofan deposits, Placer gold, White Gravels,
Publishing house : Faculty of Geology of the University of Warsaw
Publication date : 2007
Number : Vol. 57, no. 4
Page : 523 – 537

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DOI :
Qute : Rushton, A. ,Szrek, P. ,Konon, A. ,Summesberger, H. ,Kennedy, W. ,Rubinkiewicz, J. ,Bojanowski, M. ,Wierchowiec, J. ,Wierchowiec, J. , Placer gold and other economic minerals from the remnants of palaeofan deposits in the foreland of the East Sudetes, Poland. Acta Geologica Polonica Vol. 57, no. 4/2007
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