Dec 1 (Reuters) - The chief executive of Canadian miner First Quantum said he would have to look into how the company could sustain its finances in the long term, given Panama's push to annul operations at its local copper mine, the miner's biggest revenue source.

The company has notified buyers it will not be able to meet agreements due to force majeure, Tristan Pascall said in an interview with Panamanian newspaper La Prensa published on Friday. (Reporting by Elida Moreno and Valentine Hilaire; Editing by Brendan O'Boyle)