The Association of Mineworkers and Construction Union was formed in Mpumalanga, South Africa, in 1998 as a breakaway faction of the COSATU-affiliated National Union of Mineworkers. It was formally registered as a union in 2001. From Wikipedia
Over 100 Miners Escape Hostage Situation, Mining Company Estimates Approximately 110-120 Union Supporters Held Over 450 of Their Colleagues Underground Demanding Formal Union Recognition