By David McKenzie and Ingrid Formanek, CNN
Updated 1436 GMT (2236 HKT) May 13, 2016
Welkom, South Africa (CNN)The most striking thing about Joseph Mothibedi is his voice -- it is raspy, a metallic whisper.
It's the sound of a man slowly dying.
His thin fingers trembling, Mothibedi leans over his simple hot plate and puts a tea kettle on the boil.
The 58-year-old former gold miner looks reduced in his old blue work shirt. It hangs off his bony shoulders as he spreads margarine on a slice of white bread for afternoon tea. He slowly sips it in his barren brick house near an old mine-dump.