UPDATE 1 — BHP sues union at Spence copper mine over 'illegal' production stoppages, lawsuit shows
(Adds details from lawsuit, union not available for comment) SANTIAGO, Oct 15 (Reuters) — Global miner BHP has sued the workers' union at its Spence copper mine in Chile over two production stoppages that it deems "illegal," a court filing seen by Reuters on Thursday showed. In the lawsuit, BHP alleges the mine operati