JAKARTA, Dec 21 (Reuters) – * A special mining permit given to Freeport McMoRan unit PT Freeport Indonesia on Friday is valid up to 2031, and could be extended to 2041, an energy ministry official said * Copper ore output from Freeport’s Grasberg mine is expected to decline in 2019 once open pit mining ends this year, Freeport Indonesia chief executive Tony Wenas said * Output from the mine is expected to increase once again in 2020, Wenas said

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