Jeff Lewis (Adds Teck statement, byline) TORONTO, Dec 17 (Reuters) - Miner Teck Resources on Thursday said it was preparing for the possible shutdown of a key coal export terminal on Canada’s West Coast, after a union notice said strike action against terminal owner Westshore Terminals Investment Corp could commence on Saturday. Westshore said Wednesday its Westshore Terminals Limited Partnership received a 72-hour strike notice from ILWU Local 502, which represents workers at its coal export terminal at Roberts Bank, British Columbia. The company said it has been in negotiations with the union for several months over a new collective agreement after a previous agreement and two others expired Jan. 31.