toxic metals

        By Alseno Kagiso Mosai, University of Pretoria and Hlanganani Tutu, University of the Witwatersrand     Highly toxic metals are leaking out of nine abandoned mines in Krugersdorp, 32km west of Johannesburg, South Africa. The metals include uranium, arsenic, cadmium, chromium and mercury. This acid mine drainage – when water mixes with heavy metals in mines and then flows out into the environment – poses grave […]