One man was killed in a battle between hundreds of miners at a Mexican copper mine [La Caridad, owned by Grupo Mexico]..., the government said on Sunday, the latest violence in a long-running labor conflict... Three steel workers were shot dead in April 2006 when police used firearms to try and break a strike at the Lazaro Cardenas steel mill [owned by Arcelor Mittal]... Grupo Mexico and the union gave conflicting versions of what caused Saturday's violence, but it appears some...fired men wanted to enter the mine and were turned back by a large group of workers. The union said the man killed was [one of about 80 former workers who had been fired during a strike and not reinstated]... Spokeswoman Carmen Romero said the men had won a court ruling ordering the company to reinstate them.