The Big Hole, Kimberley in the Northern Cape, South Africa

The Big Hole, Open Mine or Kimberley Mine  is an open-pit and underground mine in Kimberley, South Africa, and claimed to be the largest hole excavated by hand, although this claim is disputed. The first diamonds here were found on Colesberg Kopje by members of the "Red Cap Party" from Colesberg on the farm Vooruitzigt belonging to the De Beers brothers.   Source