One more reason you don't want to mine nickel

[caption id="attachment_843394" align="aligncenter" width="900"] Slag tapping at Glencore's Sudbury Nickel Smelter. Image: Glencore[/caption] Nickel was the worst performer in a pretty sorry commodities field in 2015. The steelmaking ingredient lost just shy of 42% of its value last year. What makes...