FILE PHOTO: Trucks are seen at a copper mine of Jiangxi Copper in Dexing, Jiangxi province, China December 16, 2015. Picture taken December 16, 2015. REUTERS/Stringer/File Photo
FILE PHOTO: Trucks are seen at a copper mine of Jiangxi Copper in Dexing, Jiangxi province, China December 16, 2015. Picture taken December 16, 2015. REUTERS/Stringer/File Photo