South Africa's economic hub Johannesburg was born from a gold rush in the 19th century. Today, the illegal mining of gold and other minerals is threatening its infrastructure - damaging the city's transport and power networks, as well as homes and buildings.

Johannesburg was born from a gold rush in 1886 and grew into the richest city in Africa on the strength of what lay beneath it. Nearly a century and a half later, that same…

Whole chunks of a once-busy road in Johannesburg have collapsed because of damage caused by the illegal mining rampant across South Africa's economic hub.