 Complete the following phrase:  Krugersdorp is the site of a December 1880 gathering at which more than 6,000 men vowed to fight for the Transvaals independence. Founded in 1887 by Marthinus Pretorius after the discovery of gold on his farm, Paardekraal, thereafter the mining industry played an important role in the development of the city. Two important events in the history of South Africa: the 