IQUIQUE, Chile, Nov 19 (Reuters) - The workers union at the giant Collahuasi copper mine expects most workers to remain on strike and rejected management’s “final” wage offer, union leader Manuel Munoz told Reuters on Friday.

Munoz said the world’s No. 3 copper mine is having “many problems” with output as the strike pushed on for its 15th day.

Collahuasi offered strikers a sweeter wage proposal starting on Friday for them to abandon the stoppage and return to work. (Reporting by Fabian Cambero; Editing by John Picinich)