Mine Water Management in the Witwatersrand Gold Fields With Special Emphasis on Acid Mine Drainage

clean water from overlying aquifers before it enters the mine void • 'Keeps clean water clean' • Reduces ingress • Provides a source of clean water to local users • Will need to be properly managed in dolomitic areas to prevent subsidence Moderate Moderate N N Y Water treatment Neutralisation and iron removal • Lowest cost option • Removes most heavy metals • Can be implemented in a relatively short time • Pre-treatment stage necessary for most more-advanced treatment methods • Returns conditions to those that existed during active mining • Does not fully address salinity problems • Water produced has limited uses • Requires facilities for sludge disposal Moderate Moderate Y Y Y