let's take the worst case and make it a little worse... an easy figure to work with.. $1,000 per ounce.

16 ounces to a pound. that's $16,000 per pound.

let's say 2,000 pounds per ton. that's $32,000,000 per ton.

40 tons then would be $1,280,000,000. at 90% recovery $1,152,000,000. now take that figure times 6 to get the best case, which would be $6,912,000,000.

so, rounding down again, 40 tons of our graphite should have a value between 1 and 6 billion dollars.