"You don't keep drilling if you think nothing is there."I think...

"You don't keep drilling if you think nothing is there."

I think the driller holds a 30% interest in the project so there is added impetus for the driller to get it right.

THe Copper could be a mixed blessing for grades as would increase plant processing complexity (flotation cells on the front end) as would not want it going through a Merryl Crowe silver circuit due to preg robbing.
Recoveries for Silver normally run considerably lower than Gold to anyway.

Just my unprofesional thoughts.