South Africa's illegal gold miners forced to scavenge in abandoned shafts in a perilous attempt to survive

After 24 hours underground, he carries up dust and rock to be refined in vats of mercury and stirred in old metal gas canisters. His work can be worth anything from $3-$50. At the next step, middlemen such as John Mhofu from northern South Africa, oversee an illegal refining process and sell the gold along a chain of dealers until it reaches the pool of gold mined legally and sold around the world.
http://www.independent.co.uk/news/world/africa/south-africas-illegal-gold-miners-forced-to-scavenge-in-abandoned-shafts-in-a-perilous-attempt-to-a6919561.html