The report doesn't say what's the Ore's grade. Moorpett mentioned 2% and given it's tailings, it could be that high.
Anyhow, I'm quite wrecked after today and it was rather the miscalculation that striked me.
They processed 1440t of y% grade ore to get X amount of tons of 32% grade pre-concentrate. So, they have now 1440*(y/32) tons of 32% pre-concentrate. And similar, X tons of 32% grade will shrink to X*(32/a) tons of a% final concentrate.
Assuming y=2%, you get 90t of 32% pre-concentrate. If they are happy to sell 68% grade final concentrate, they'll get 42 tons of it. It's just playing with numbers. I think the 42t is a bit too much, so the ore from tailings might be much smaller grade. How much smaller I don't know. If someone knows the number, put it in equation and youyou get an approximate amount of the final concentrate.
Makes sense?
The report doesn't say what's the Ore's grade. Moorpett...
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