I pointed this out to someone who did a napkin valuation on DON based on the feasability and figured it should be shared here as well.

". A 10% increase in metal prices translates to a 12 fold increase in net present value and a 2 fold increase in internal rate of return." Zinc right now is .99 which is over a 20% increase on the .80 they used.So if all the calculations seem to be coming in around the mid .30's using the lower #'s,would it not be easy to say .40's using todays zinc price.