The department of water affairs has laid criminal charges against the mine managed by relatives of former president Nelson Mandela and President Jacob Zuma for pumping mine water into a protected wetland.
"They are pumping out 180 megalitres through their reactor per day without treating it and this gets dumped into the river," charged the department's water quality director Marius Keet.
The water in the internationally protected Blesbokspruit had low pH levels, which meant it was acidic, and contained high levels of iron and suspended particles, he said.
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Mine nationalization preview