It is a really good question. Let me take a stab.
Let's assume that the market would at least give us credit for the 19.91 million P&P oz. which the company has already identified with a US$650 POG. Let's imagine that there might have been more drilling and that some of the M&I resources were converted to P&P. And of course POG is closer to US$900. So I am guessing that the market might have been giving us value for 21 million oz.
Let's assume that the value of the oz in the ground pre-production was in line with other companies in similiar environments (I know that thei number is wide ranging and highly debatable) and be conservatively optimisitc and say $120/oz.
So that would give us a market cap of US$2,500 million.
Lets' say there are 300 million shares.
That would give us a price per share of about US$8.40