I meant that from those really low average grade(0.1-0.12g/t) ore we might still pull out 3-4-5% of the mass with 30-40% gold recovered trough the process,and still reach similar ore grades what goes into the stage1 milling hence creating economic ore from complete waste material.
As far as my understanding goes a significant part of the ore sorter operational expenses is the high pressure guning out the selected ores from the conveyor, so the less is your selected ore from the mass the less it costs to do so, and thats what helps most probably on the cost side of that excercise, althought i couldnt get an answer from Brent when i asked what could be the average cost differences when we do lets say 5% mass pull compared to 40-50% mass pull.
I hope those comments help to underand better what i meant.
Sometimes reading back my own comments even i get confused
Meanwhile oresorting isnt the cheapest excercise, but Brent told me this when i asked him about my oresorting cost concern refereing to one of his past podcast comment : "A large plant will have much much lower operating cost than a small plant" he also said of course that the capex side is also significantly lower for a large operation. For the capex side Chris already throwed around a 900 grand/ore sorter machine cost, of course you need a lot more than just the machine to fix a circuit but it seems very cheap to me.
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