Contaminant release from sulfidic mine tailings: column experiments and geochemical modelling

Forsyth, Bronwen, Edraki, Mansour, Baumgartl, Thomas and Lassabaterre, Laurent (2013). Contaminant release from sulfidic mine tailings: column experiments and geochemical modelling. In: Stuart Winchester, Fernando Valenzuela and David Mulligan, enviromine2013: 3rd International Seminar on Environmental Issues in Mining. Proceedings. enviromine2013: 3rd International Seminar on Environmental Issues in Mining, Santiago, Chile, (401-409). 4-6 December, 2013.

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Name Description MIMEType Size Downloads
Author Forsyth, Bronwen
Edraki, Mansour
Baumgartl, Thomas
Lassabaterre, Laurent
Title of paper Contaminant release from sulfidic mine tailings: column experiments and geochemical modelling
Conference name enviromine2013: 3rd International Seminar on Environmental Issues in Mining
Conference location Santiago, Chile
Conference dates 4-6 December, 2013
Proceedings title enviromine2013: 3rd International Seminar on Environmental Issues in Mining. Proceedings
Place of Publication Santiago, Chile
Publisher Gecamin
Publication Year 2013
Sub-type Fully published paper
ISBN 9789569393044
Editor Stuart Winchester
Fernando Valenzuela
David Mulligan
Start page 401
End page 409
Total pages 9
Collection year 2014
Language eng
Formatted Abstract/Summary
Understanding the processes which control the chemistry of seepage from Tailings Storage Facilities is an important aspect of the long-term management of these facilities. These processes can be investigated in the laboratory by column leaching experiments and modeled by kinetic and equilibrium geo-chemical modeling. The objective of the modeling part was to verify and refine a conceptual model of pH evolution and element release from sulfidic mine tailings using laboratory-based column leaching results. Mine tailings were sourced from a sedimentary-exhalative copper, lead, zinc and silver deposit, containing 1 to 30 wt.% sulfide minerals and 3 to 18 wt.% carbonate minerals with elevated levels of arsenic, cadmium, cobalt, copper, lead, antimony, selenium, thallium and zinc. Column leaching was undertaken across a 13 month period on weathered and freshly deposited undisturbed tailings samples under variably saturated conditions. A chemical tracer (potassium chloride) was applied to the columns at experiment completion to characterize flow parameters. Forward and inverse geochemical modeling was undertaken using the LLNL database incorporated in PHREEQCI to describe the mechanisms responsible for pH evolution and element release. Geochemical modeling proved to be a powerful tool in assessing the initial hypotheses regarding the contribution of minerals and kinetic limitation of dissolution rates.
Keyword Geochemical modelling
Water flow
Mine waste
Q-Index Code E1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Presented during Session 7 "Management and effluent water treatment".

 
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Created: Wed, 11 Dec 2013, 04:17:06 EST by Thomas Baumgartl on behalf of Centre For Mined Land Rehabilitation