text: This industry was controlled by businessmen called "Randlords.
full_question: This industry was controlled by businessmen called "Randlords." A surge in this industry was centered onWitwatersrand and led to the foundation of the Ferreira's Camp district. Workers in this industry developedthe pidgin language Fanagalo and participated in a 2012 strike against Lonmin. Some of those strikers in thisindustry were killed by police in the Marikana massacre. This industry led to the growth of Johannesburg. DeBeers, a company in this industry, was founded by Cecil Rhodes and operates a facility at Kimberley. For 10points, name this industry that produces ores and precious gems. 
first_sentence: This industry was controlled by businessmen called "Randlords.
raw_answer: South African mining [or specific types of mining, such as diamond mining or gold mining] 