This water finds its way into a nearby stream, the water of which accordingly has an unacceptably low pH value and high sulphate content. Unfortunately their capacity is limited, which means that water overspills and seeps from them. Most of the water from the backfilled area drains into control reservoirs. The investigation showed that most of the acid mine drainage is emanating from old opencast workings which have been backfilled. Hence, an initial investigation was carried out to determine the source of acid mine drainage pollution and the associated hydrogeological conditions. This has led to a deterioration in the water quality in many surface streams. Several mines in the Witbank coalfield in South Africa are affected by acid mine drainage.
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