Thousands of people face evacuation from greater Johannesburg in the Gauteng province – the economic heartland of South Africa – due to toxic sludge from abandoned gold mines laced with high radiation levels.
See http://www.minesandcommunities.org/article.php?a=11315.
Among companies which have mined for gold in South Africa over many years are London-listed Anglo American and AngloGold Ashanti. It is unclear whether any of their former operations are implicated.