(1)Whether he is aware of the incident on 21 February 2017 at the Kareerand Silt Dam near Stilfontein in North West where large quantities of silt were dumped into the Vaal River; if so, (a) what was the extent of the pollution in the immediate environment of the Kareerand Silt Dam and in the Vaal River and (b) what steps (i) have been taken to limit and neutralise the impact of the immediate pollution and (ii) are being taken to prevent future dumping;