Last time Nickel traded at $6us/lb (20 sept 04) JBM was trading at $4.35.
Last Nickel prices dropped as much as last night(over 15%) was in January 1988.
Nickel prices peaked in March 1988 at $10.84 us/lb.
Buy yes, expect JBM(amongst others) to take a bit of a pounding today :)
Cheers.