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THE EFFECT OF WATER TABLE ELEVATION ON ACID MINE DRAINAGE FROM REACTIVE TAILINGS
 

Summary: THE EFFECT OF WATER TABLE ELEVATION ON ACID MINE
DRAINAGE FROM REACTIVE TAILINGS:
A LABORATORY AND NUMERICAL MODELING STUDY1
M. Ouangrawa2
, J. Molson2
, M. Aubertin2
, G. Zagury2
, and B. Bussière3
Abstract. Laboratory column experiments and numerical simulations are used to
evaluate the effectiveness of an elevated water table as a management and
reclamation method for acid-generating mine tailings. The laboratory
experiments involved monitoring oxygen and effluent chemistry from several
columns of mine tailings with different water table elevations. Each column
contained a layer of reactive tailings overlain by a sand cover and was subjected
to transient recharge and flushing in fourteen 30-70 day cycles for 502 days. A
free-draining control column with no sand cover was also used. The experimental
results were compared with numerical simulations using the fully coupled reactive
transport model MIN3P, which included infiltration, saturation-dependent oxygen
diffusion, pyrite oxidation, multi-component geochemical reactions, and mineral
buffering. The numerical results were consistent with the observed data which

  

Source: Aubertin, Michel - Département des génies civil, géologique et des mines, École Polytechnique de Montréal

 

Collections: Engineering; Environmental Management and Restoration Technologies