"My real point is that no one knows what the AISC will be....

"My real point is that no one knows what the AISC will be. $1,500 maybe just as good a guess as $1,000 or $1,200 and I feel it may be lower than $1,500. One can probably make a case for $1,000 as one broker did or $1,500 as it depends on the assumptions one makes about all the above unknowns."

Yes tricky to predict an AISC , more tonnage outside of what NN is capable of producing will most likely result in an overall lower grade pushing up the overall AISC per ounce but those extra lower grade ounces will make the total profit per annum greater than by just mining NN

However at some inflection point the marginal return will go negative on those extra ounces probably close to what the cut off grade is , which in itself becomes a moving target have visions of a computer program like Leap frog showing a pit shell contracting and swelling LOL .