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ANTOFAGASTA, Chile, Feb 9 (Reuters) - Workers at BHP Billiton's Escondida copper mine in Chile walked off the job on Thursday morning with buses sent to replace the night shift arriving empty, a union spokesman told Reuters.
A planned strike at Escondida will "officially" start at 8 a.m. local time (1100 GMT), said mine spokesman Carlos Allendes. BHP has said the mine will not produce copper during the strike. (Reporting by Fabian Cambero & Anthony Esposito; writing by Gram Slattery; editing by Jason Neely)