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At least 17 miners have been killed in labour unrest -- sparked by ethnic differences -- at Driefontein Consolidated and Gold Fields ' Kloof Gold Mining Co this month .
 organization: Driefontein Consolidated and Gold Fields ' Kloof Gold Mining Co
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 organization: Driefontein Consolidated and Gold Fields ' Kloof Gold Mining Co