Panama has authorized the sale of copper concentrate at First Quantum's shuttered Cobre Panama mine, President Jose Raul Mulino said on Thursday, boosting shares in the Canadian miner by 15% to a two-month high on the Toronto Stock Exchange.

First Quantum Minerals Ltd. was cleared to begin shipping out stockpiled copper in Panama, the latest sign authorities may be willing to negotiate a restart of the company’s giant shuttered mine.

First Quantum Minerals (OTCPK:FQVLF) +9.4% in Thursday's trading after Panama’s President Mulino said he will begin a review next week of its shuttered Cobre Panama copper mine and ordered the restart of a power plant needed to operate a nearby port that has been used to export the mine's production.