The dust is one of the major problems as it goes into our lungs then bloodstream. Could also contribute to lethargy.
That's one of the remediation efforts. The processing techniques have been improved, and a company in jhb south started on dumps in the east rand. It is quite profitable as they don't spend money on drill bits etc. The problem, however, is that people live so close. As they remove the dum, more dust is disturbed. It is quite environmentally unfriendly to do the reprocessing (they will tell you differently thought).
Thanks for the comment and insight