Miner KGHM extends negotiations with union at Chilean copper mine -union

BUENOS AIRES, March 19 (Reuters) - Miner KGHM will extend negotiations with a union at its Chilean copper mine Sierra Gorda, averting a strike, a union representative said on Tuesday.

The company had until the end of Tuesday to request government mediation to help reach a deal with the union of 520 workers.

(Reporting by Fabian Cambero; writing by Cassandra Garrison; Editing by Sandra Maler)