Think there are gold credits above your 1% average Cu guess you...

Think there are gold credits above your 1% average Cu guess you have to take that into account with smaltering

for simplicity you may just want to use a figure of A$13000 a tonne for Cu , that is what I worked your value to be for Cu

5.5 *5.0 drive (just guessing they look bigger) = 27.5m cubic meters say 750 meters mined out in 3 months = 20,625 BCMs
20625 * SG3 = 61,000 tonnes from 1 TBJ

Really depends on the speed of the jumbos but I know very little about about UG so just blowing smoke out of ny ear or wherever