I went thru all the numbers about this years ago and at the time...

I went thru all the numbers about this years ago and at the time said that one of the key pieces of information required was the recovery results which we were never given but on 60/65% recovery which is all you could expect means you would need to have a gold price of $3000 per ounce too make some modest profits but all depending on recoveries.
Yes you could increase recovery buy increasing capital spend on roasting / fine grind ect , This would be dependant on lab work results .
Other unknowns are if arsenic levels are high they are still recoverable but require larger consumptions of sodium cyanide.{ i believe high arsenic to be the case like with most tailings )
Also trucking the tailings to a plant not on lease is another expense not included .
So its likely their is some money to be made here but i would think marginal.