The South Deep gold mine west of Johannesburg, which is already benefits 50 MW of solar power commissioned last year, is poised to be boosted by another 50 MW to 80 MW of wind power going forward. “We’re busy with the wind study to put up those turbines. We’re having very positive results on the tower that we put up,” interim Gold Fields CEO Martin Preece told Mining Weekly during a media briefing following the company’s release of quarter-three operational results.