BRIEF-Copper miner Antofagasta says environment is challenging in short-term
May 21 (Reuters) - Antofagasta Plc
* We remain on track to meet our formal production guidance that we issued in january of this year of 700,000 tonnes of copper
* Continue to work on reducing costs and further on enhancing longer term prospects of business
* We have to be careful in more challenging short-term environment
* Remain one of best positioned copper producers in terms of costs and exposure for when market picks up and copper prices rise. Further company coverage:
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