Abstract Ros¸ia Montana˘, the largest European gold mine, could be re-opened. Environmental problems led to severe pollution of the Ros¸ia 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¸ia Montana˘ 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.

Waste rock investigation at Rosia Montana gold mine (Romania) : a geostatistical approach / D. Servida, S. Comero, M. Dal Santo, L. De Capitani, G. Grieco, P. Marescotti, S. Porro, F.L. Forray, A. Gàl, A. Szakàcs. - In: ENVIRONMENTAL EARTH SCIENCES. - ISSN 1866-6280. - 70:1(2013 Sep), pp. 13-31.

Waste rock investigation at Rosia Montana gold mine (Romania) : a geostatistical approach

D. Servida
Primo
;
S. Comero
Secondo
;
L. De Capitani;G. Grieco;S. Porro;
2013-09

Abstract

Abstract Ros¸ia Montana˘, the largest European gold mine, could be re-opened. Environmental problems led to severe pollution of the Ros¸ia 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¸ia Montana˘ 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.
Waste rock; Mine dump; Acid mine drainage (AMD); Positive matrix factorization (PMF); Rosia Montana; positive matrix factorization; geochemical characterization; Apuseni mountains; Eastern Liguria; Western Romania; pollution; mineralization; apportionment; evolution; sediments
Settore GEO/09 - Georisorse Miner.Appl.Mineral.-Petrogr.per l'amb.e i Beni Cul
Settore GEO/08 - Geochimica e Vulcanologia
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/262360
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