Underage workers are being abused in illegal South African gold mines, an investigation has found.

Minors are being recruited for both cheap labour and to exploit them for sex, according to the BBC.

Most of the children in the mine are foreign and do not understand what they are getting into, according to a whistleblower.

Jonathan, now in his late 20s, had migrated to South Africa from a nearby country on the promise of making easy money working in one of its dozens of disused mines.

These mines have previously been closed by multinational firms due to a lack of commercial viability, but are still utilised by illegal workers and controlled by criminal gangs.