Acidic seepage from waste on abandoned mines threatens supply.
A water time-bomb is ticking for millions of users of water from the Vaal River (South Africa) - by 2014, it will not be suitable for human consumption.
Researchers said the problem was caused by acidic water seeping from waste on abandoned mines and by the discharging of untreated acidic mine water into rivers and streams tributary to the Vaal River system.
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