From Macquarie:
At the start of 2016, we expected some stabilisation in the metals demand environment at a subtrend level, with aluminium among the major metals having demand growth >2.5% and steel demand negative. However, latest data points point to some optimism across commodity markets, led by strong hopes for the coming Chinese construction season plus a nascent global industrial production recovery.
To be clear, fundamentals do not point to any inflationary bottlenecks ex-raw material constraints (such as zinc). Much still rides on Chinese policy, and even our revised demand growth would be considered sub-trend. However, confidence that January 2016 marked a price bottom that will not be repeated in the near term continues to grow.