Koffiefontein diamond mine

The mine was opened in 1870 and has been closed several times in its history and never became a large production site. The total production of the mine was 7.3 million carats (1460 kg), and the largest gem weighed 139 carats (27.8 g). The mine was most recently reopened in 1987 however De Beers announced its final closure in January 2006.