Not a Illusion The grade here is not a illusion, it looks like the ramp on a roller coaster. This Freeport McMoran Copper and Gold Company's "Hill Turn" is hanging over the steepest part of the grade. The rear visible tanks sitting on a jaw dropping 4.5%. Dynamics are humming and brakes squealing as this "Hill Turn' drops towards Clifton with a headend heavy in copper concentrate and
anodes....
