Rabid, your estimates lend itself to the model I used below. I conservativley used $5B for CAPEX and $15/tonne for OPEX. Came up just under $6/share.
So using your CAPEX and including silver and expanded resources I would think that the mine would be valuated somewhere in the $10 plus range or more. Not including new zones of exploration interest.
Current world affairs, metals prices and Enchavaria hold the hammer.
Enchavaria owns the majority and I would venture a guess that he is averaged in somewhere around $0.20. So I would imagine that if he for some reason wants to take a lowball offer he could still make a 10 bagger at $2.00. Scarry thought but a possibility none the less.
All JMO.
Have a great day all!