Thing we are missing is drill costs and what the net cost to BRK...

Thing we are missing is drill costs and what the net cost to BRK actually is. Puzzled over this and then decided I didnt care as the drill plan should be optimised to utilise all the FCF and therefore its what pops out at the end that counts (maybe at the final peak or just before, noting there is likely some debt to repay then).

Alternatively need to focus only on the pieces where all drill costs have been paid i.e. the first green (and the cash on hand) or the green plus FMDP (assuming nil cash on hand at the moment - as all cash is considered spent for drilling FMDP)

Hope that makes sense