(206a-206g) Combined numerical and analytical modelling as a means to assess closure options for open-pit mines, Pilbara region

摘要

The Yandicoogina iron ore mine is operated in a complex hydrological environment. A combination of numerical and analytical modelling has been used to determine the optimal use of limited waste material to backfill pits, and minimise impacts on the local groundwater and surface water environments. The modelling suggests that selective distribution of the waste material can result in a wide spectrum of water salinities, ranging from fresh to saline. This is particularly true for the two pits located down gradient which receive through-flow from up gradient pits. In addition, this study shows that the salinity of the pits is primarily controlled by surface water inflow from surrounding catchments.