Chemical characteristics of groundwaters at two massive sulphide deposits in an area of previous mining contamination, South Iberian Pyrite Belt, Spain

Pauwels, H. and Tercier-Waeber, M.L. and Arenas, M. and Castroviejo Bolibar, Ricardo and Deschamps, Y. and Lassin, A. and Graziottin, F. and Elorza Tenreiro, Francisco Javier (2002). Chemical characteristics of groundwaters at two massive sulphide deposits in an area of previous mining contamination, South Iberian Pyrite Belt, Spain. "Journal of Geochemical Exploration", v. 75 (n. 1-3); pp. 17-41. ISSN 0375-6742. https://doi.org/10.1016/S0375-6742(01)00198-4.

Description

Title: Chemical characteristics of groundwaters at two massive sulphide deposits in an area of previous mining contamination, South Iberian Pyrite Belt, Spain
Author/s:
  • Pauwels, H.
  • Tercier-Waeber, M.L.
  • Arenas, M.
  • Castroviejo Bolibar, Ricardo
  • Deschamps, Y.
  • Lassin, A.
  • Graziottin, F.
  • Elorza Tenreiro, Francisco Javier
Item Type: Article
Título de Revista/Publicación: Journal of Geochemical Exploration
Date: May 2002
ISSN: 0375-6742
Volume: 75
Subjects:
Faculty: E.T.S.I. Minas (UPM)
Department: Ingeniería Geológica [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

A detailed chemical study of groundwater was carried out to elucidate the processes controlling the oxidation and dissolution of sulphide minerals at two massive sulphide deposits in the Iberian Pyrite Belt (IPB), i.e. the mined La Zarza deposit and the unmined Masa Valverde deposit. It was found that major-element compositions varied according to the hydrological regime, La Zarza being in a relatively high area with groundwater recharge (and disturbance due to the human factor) and Masa Valverde being in a relatively low area with groundwater discharge. The variations mainly concem pH, Eh, S04 and Na concentrations. Metal concentrations were determined (a) by ICP-MS after filtration, and (b) in sorne cases by voltammetric measurement of Cu, Pb, Zn, Cd and Mn using the Voltammetric In situ Profiling (VIP) System, which allows detection of only the mobile fractions of trace elements (i.e., free metal ions and small labile complexes a few nanometers in size). If one compares the results obtained by each of the two methods, it would appear that the groundwater shows significant enhancement of metal solubility through complexing with organic matter andlor adsorption onto colloids andlor small particles. In areas of sulphide oxidation, however, this solubility enhancement decreases according to Cu> Zn>Cd>Pb. Dnder very low redox conditions, the attained metal concentrations can be several orders of magnitude (up to 108-1 09 for Cu and 102-103 for Pb) larger than those expected from equilibrium with respect to sulphide minerals as calculated with the EQ3NR geochemical code; Zn concentrations, however, are close to equilibrium with respect to sphalerite. The implication of these results is discussed with respect both to mineral exploration and to environmental issues.

More information

Item ID: 10223
DC Identifier: http://oa.upm.es/10223/
OAI Identifier: oai:oa.upm.es:10223
DOI: 10.1016/S0375-6742(01)00198-4
Official URL: http://www.sciencedirect.com/science/journal/03756742
Deposited by: Biblioteca ETSI Minas y Energía
Deposited on: 03 Feb 2012 12:28
Last Modified: 20 Apr 2016 18:27
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