42.5% recovery times 2.95% grade times 85% smelter payable times...

42.5% recovery times 2.95% grade times 85% smelter payable times $US2,500 = $US26.64 revenue from each ton of “ore” mined.

LESS
The cost to mine. While cheap I can’t see anywhere where the ore mined is clearly linked to the concentrate produced so impossible to come up with a concentration ration. But let’s say it 20:1. So every 20 tons of ore makes 1 ton if concentrate. 

Good luck with that. Don’t worry about smelter charges, ocean freight , penalties