Factors Controlling The Release Of Arsenic
From Mining Tailings
Author(s)
B. E. Rubio-Campos, I. Cano-Aguilera,
A. F. Aguilera-Alvarado, G. De la Rosa & S. H. Soriano-Pérez
Abstract
Some mine tailings pools in the Mine District of Guanajuato, Mexico, present a
varied distribution and temporal and spatial concentration of elements that are
potentially toxic, such as manganese, cadmium and zinc. These elements were
detected in majority concentrations, and arsenic was present in the two major
oxidation states As(III) and As(V). The highest arsenic concentration in the
surrounding surface water reservoirs was detected when a rainy seasons
occurred, which in turn is mainly a function of pH and the presence of
bicarbonate ions. The conceptual model to describe the mobilization of arsenic
from mining tailings towards the aqueous systems proposes a scenario where
oxidation, the neutralization of acid drainage by carbonates, and arsenic
desorption by bicarbonates takes place in different steps and at different times.
Keywords: mining tailings, potentially toxic elements, arsenic release.
1 Introduction
The mining district of Guanajuato is located 475 km from Mexico City. It is
considered one of the largest worldwide. However, large amounts of mining
tailings, which result from crushing and milling ore, once they have been
recovered through commercial metal physical or chemical processes, have been
generated over time [1]. These can be transported and become a severe
environmental problem in relation to soil, sediment, surface water and
groundwater pollution [2].
Keywords
mining tailings, potentially toxic elements, arsenic release
Related Book
Other papers in this volume
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