RE:RE:PEA4.94 is the net of cobalt after accounting for proceeds of other metals.
The total cost per pound of cobalt is $13.25.
Copper in Copper Sulfate:34,911,000 x $4 = $139,640,000
Magnesium Sulfate: 220,000 tons x $250/ton = $550,000,000
Gold: 38,070,000 Copper concentrate (gold/copper): 61,120,000
Total credits = $293,910,000
Cobalt production = 35,356,000 pounds
Credit/pound = $8.31
$13.25 - $8.31 = $4.94
I can't fully match their gold numbers, but the impact is only a few million $, and I might not have all the info needed.