RE:RE:Mill Expansion Plus High Grade Blue Sky! HUGE POTENTIAL!!!15000 × 365 × 1.43 ÷ 31.1 × 0.93 = 234 Koz/a. Even just a 10% increase in grade leads to a massive increase in production. And these grades are multiples higher. For example: Using your equation AG. 15000 x 365 x 1.63 / 31.1 x 0.93 = 267 koz/a. just my opinion.