Nov 20 (Reuters) - One of the unions on strike at Chile's Candelaria copper mine has accepted a new 30-month collective agreement from Lundin Mining Corporation LUN.TO on Friday, the company said in a statement. Candelaria AOS Union, representing about 550 workers at Lundin's Candelaria operations in Chile, has accepted the last formal offer which was presented by Candelaria on Nov. 12, 2020, the company said.