'There's a lot of money down there': the deadly cities of gold beneath Johannesburg

Millions of ounces of unmined gold are still believed to lie below the surface, fuelling a booming - but frequently deadly - illicit industry

As he prepares to descend an abandoned mineshaft in the Johannesburg suburb of Roodepoort, Fix, a sinewy informal goldminer from Lesotho, recounts stories of subterranean gun battles and unearthing the scattered bones of those who came before him.

"This is very dangerous work," he says, draining a quart of beer for courage. "But there's a lot of money down there."