TORONTO — First Quantum Minerals Ltd. says it lost US$1.45 billion in the last quarter of 2023, and warned its ability to continue operating could be in doubt if it is unable to shore up its balance sheet in light of the shutdown of its Cobre Panamá mine. The Toronto-headquartered mining company suspended production at the open-pit copper mine in Panama at the end of November after Panama's Supreme Court ruled that a 20-year concession agreement covering the copper mine was unconstitutional. The