Some comments:

The $75 "in ground" value for the 800k tons of already mined ore is low. There are no mining costs, and no 5-8 year delay for permits, financing, construction, mining, etc. SFMI is producing now. With $50/ton milling costs, doubled to account for hauling, smelting, etc., you still get a net of over $1000/t at an average 1 oz/t and $1300 gold. That's $800M, or $3 per share. And the 1 oz/t may be low, since the 0.75 oz SFMI used while getting the mill going is their "lower" grade.

There are estimates of 5-8M tons of Au eq in the mountain. Using $100/oz as a lower limit price for this (SFMI's mining costs will be very low, est. <$200/t) adds another $5-800M to the value, or a total of $5-6/share.

I think those are conservatiive numbers.