I see that workers at the world biggest copper mine have gone on strike in Chile
http://www.cnbc.com/2017/02/07/workers-at-chiles-escondida-copper-mine-to-strike-thursday-union.html
Newcrest Copper production has been increasing. (Q4 25,176mt vs Q3 23,723mt)
One could suggest this would be a positive for NCM equity holders.