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CONCEPTUAL AND NUMERICAL MODELS OF OXYGEN DIFFUSION, SULPHIDE OXIDATION AND ACID MINE DRAINAGE WITHIN
 

Summary: CONCEPTUAL AND NUMERICAL MODELS OF OXYGEN DIFFUSION,
SULPHIDE OXIDATION AND ACID MINE DRAINAGE WITHIN
DISCRETELY FRACTURED POROUS MEDIA
J. Molson, M. Aubertin, V. Martin, Ecole Polytechnique Montreal, Canada
B. Bussière, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, Canada
ABSTRACT
The generation and transport of acid mine drainage (AMD) through discretely fractured porous media is simulated for two
reactive mine waste systems. The first conceptual model is based on desiccated reactive paste tailings, such as those
produced at the Bulyanhulu Mine, Tanzania, Africa. These tailings are deposited in successive layers as a thickened
paste, which drain, consolidate and dry out by evaporation, leaving desiccation cracks on the order of several millimeters
wide, up to 1 m deep (depending on layer thicknesses) and fracture spacing on the order of 0.2 - 2 m. The second
conceptual model considers a deposit of reactive tailings overlying a fractured rock mass. Both modelling approaches
consider oxygen diffusion, sulphide mineral oxidation, geochemical speciation and advective-dispersive transport within
discretely fractured media. The paper addresses issues of time scales and AMD fluxes, assuming various fracture
scenarios.
RÉSUMÉ
La génération et le transport des produits issus du drainage minier acide (DMA) dans un milieu poreux fracturé est
modélisé pour deux systèmes comprenant des résidus miniers réactifs. Le premier modèle conceptuel est basé sur des
résidus en pâte déposés en surface qui se sont asséchés, comme ceux produits au site de la mine Bulyanhulu en
Tanzanie (Afrique). Ces rejets de concentrateur épaissis sont déposés en plusieurs couches qui se drainent, se

  

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

 

Collections: Engineering; Environmental Management and Restoration Technologies