P. Sottnиk, M. Petrak, J. Michnova, L. Jurkovic, B. Voleková
Monday 5 August 2013 by Libadmin2013

References: 13th SGEM GeoConference on Science and Technologies In Geology, Exploration and Mining, www.sgem.org, SGEM2013 Conference Proceedings, ISBN 978-954-91818-7-6 / ISSN 1314-2704, June 16-22, 2013, Vol. 1, 603 - 608 pp


Au-porphyry deposits represent a relatively new type of deposits of the of porphyry
group, that in the world has a growing importance. Typically they are located in
Maricunga belt in N Chile, Middle Cauca in Columbia, Peru, Turkey, Nevada
and California. The Central Slovakia Volcanic Field is known to host Cu-Au skarnporphyry
and porphyry types of deposits and occurrences for a long time. In the past,
this type of mineralisation was already the target of prospecting and exploration
especially as a perspective source of copper, but without finding economically mineable
accumulations of ores. In the year 2006 the company EMED Slovakia, determined at
the locality Biely Vrch near Detva the presence of a new type of porphyry
mineralisation with a relatively high Au/Cu ratios, in the literature marked as Auporphyry
mineralisation [1].
Low content of metals and big amount of ore in porphyric systems requires exploration
by open pit methodology which produces a big volume of mining waste. In the case of
Au porphyry systems it is possible to produce gold efficiently only by cyanide leaching,
what increases requirements for a safe environmental management of exploration.
Slovakia has signed the agreement about implementation of Directive of the European
parliament and of the council 2006/21/ES from 15th March 2006 on the management of
waste from the mine industry. The law No. 514/2008 on management of waste from
mining industry with related legislative changes is valid at the moment in Slovak
republic. According to this law the mining waste sites have to be categorized by kind,
volume and properties of deposited mining waste, localisation of mining waste sites,
local environmental conditions and risk of serious accidents on mining waste sites of A
and B category.
Mining waste is necessary to characterize when the mining waste management plan is
created, especially if there is not enough information for mining waste site
categorization. Mining waste testing is focused to two groups of waste properties:
- geotechnical properties
- geochemical properties and waste behaviour
Definition of mining waste properties include determination of chemical and
mineralogical properties of mining waste and all chemical substances and agents
remained in mining waste. Main goal of environmental part of the project is to
determinate geochemical composition and subsequent behaviour of mining waste after
deposition on mining waste sites. These data will be used as a base for determination of
potential chemical composition of drainage waters for each kind of mining waste during
the operation of mine.

Keywords: mining waste, evaluation, toxic elements, Au ores