2 research outputs found
Determination of total selenium content in cereals and bakery products by flow injection hydride generation graphite furnace atomic absorption spectrometry applying in-situ trapping on iridium-treated graphite platforms
Waste rock dump investigation at Ro\u15fia Montan\u103 gold mine (Romania): a geostatistical approach
Abstract Ros\ub8ia Montana\u2d8, the largest European gold mine, could be re-opened. Environmental problems led to severe pollution of the Ros\ub8ia and Abrud Rivers. The two main potentially toxic element (PTE) sources in mine sites are, in general, the abandoned underground workings and
the piles of waste rock. Since the composition of waste rocks is often heterogeneous, this study faces the problem of estimating their mineralogical and chemical features starting from a set of sampling point. Twenty-five samples were collected on the main waste dump of the Ros\ub8ia
Montana\u2d8 mine following a virtual squared grid (knots distance about 25 m). Grain size, color, bulk chemistry, mineralogy, acid mine drainage potential and a set of selected PTE (Ag, As, Cu, Ni, Pb and Zn) concentrations were determined on each sample. In a first approximation two main waste rock groups were identified: WR1 bulk composition is dacite-dominated, while WR2 is andesitedominated.
In both of them the concentrations of PTEs are
below the regulatory limits for soils, with the exception of
As. In terms of acid mine drainage, WR1 has a net acidproducing
potential, while WR2 has a net neutralizing
potential. The anisotropy of WR properties were analysed
by means of semi-variograms and displayed with contour
maps. Application of positive matrix factorization for the
analysis of all the data relative to waste rocks allowed
defining, in a semi-quantitative way, the factors controlling
pollution and their spatial distribution. The processing of
score matrix G factor associated with the geostatistical
elaboration promises to be a powerful tool to discern the
composition of mine dumps and support the exploitation
and remediation phases