RE:RE:Questions about their grade control system Goldminers comment is the the most succint answer to the grade control question. Drill hole cuttings and other techniques MIGHT allow daily optimisation but with minor exceptions all the stope muck will be milled. If there are seven active stopes right now ( could be more , could be less) that means one stope blast in every stope every week. You start to run out of flexibility real fast if you have a low grade zone you would rather not process that particular week.
Average blast will be close to 3000 tonnes