UPDATE 1-Platinum bosses say "unrealistic" demands behind S.Africa strike
January 21, 2014 at 13:27 PM EST
JOHANNESBURG, Jan 21 (Reuters) - Bosses of the world's top three platinum producers accused South Africa's AMCU union of making "unaffordable and unrealistic" demands on Tuesday ahead of a strike this week which could hit over half of global output of the precious metal.