Is it possible to convert old coal mines into successful farms?

The rehabilitation of South Africa’s closed coal mines has long been a source of contention among miners, environmental activists and affected communities. Numerous old mines were not rehabilitated at all, while many others were rehabilitated to within only the bare minimum requirements of the law, leaving the land looking restored but, ultimately, not suitable for the growing of crops, owing to the plethora of toxic chemicals and metals that remain in the soil and water.