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SIMULATING TRANSPORT AND GEOCHEMICAL EVOLUTION OF ACID MINE DRAINAGE THROUGH
 

Summary: SIMULATING TRANSPORT AND GEOCHEMICAL
EVOLUTION OF ACID MINE DRAINAGE THROUGH
DISCRETELY FRACTURED POROUS MEDIA
J. Molson and M. Aubertin*
Dept. of Civil, Geological & Mining Engineering, Ecole Polytechnique,
Montreal, Quebec, Canada
B. Bussière*
Dept. of Applied Sciences, Université du Québec à Témiscamingue,
Rouyn-Noranda, Quebec, Canada
*Industrial NSERC Polytechnique/UQAT Chair in Environment and
Mine Waste Management
ABSTRACT
A modelling study is performed to assess the evolution of acid mine drainage (AMD) in fractured subsurface environments
using two simulation methods: the equivalent porous medium (EPM) and the discrete-fracture network (DFN) approach.
The 2D simulations are conducted using the numerical flow and reactive transport model POLYMIN (Molson et al. 2005)
based on a mixed silicate-carbonate host rock overlain by reactive tailings. The POLYMIN model uses the local equilibrium
assumption (LEA) for geochemical reactions and embeds discrete 1D or 2D planar elements into the porous matrix blocks
to represent the discrete fracture network. Multi-component advective-dispersive transport, geochemical speciation and
water-rock interactions are accounted for. The conceptual modelling approaches are compared using predicted pH and
concentrations of aqueous oxidation products including SO4 and Fe. The EPM vs. DFN comparisons show that even for a

  

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

 

Collections: Engineering; Environmental Management and Restoration Technologies