How many black workers does South Africa’s National Union of Mineworkers represent?

South Africa’s National Union of Mineworkers which says it represents 200,000 black miners, is calling a strike from Sunday over pay and conditions. The action could affect up to 45 gold and coal mines. The Union is demanding a pay rise of 30% and improved working conditions but the mine owners say there is no further money available. The black Mineworkers leader, Mr. Cyril Ramaporsa said the strike would be the biggest in the mining industry in South Africa’s history. He says: "Our members are not kidding. They are going to pursue their demands until they are met."