A labourer carries honeycomb briquettes at a coal processing factory in Shenyang, Liaoning province in this December 2, 2009 file photo. A surprise spike in iron ore prices in 2016 is shaking out fresh supplies of the steelmaking raw material, but some miners say it is too soon to aggressively restart production shuttered by a years-long price rout. (Photo by Sheng Li/Reuters)
