my incremental increases would be from existing recoveries...

my incremental increases would be from existing recoveries taking it from a planned 93% to 95 or 96% which would translate into about 400t/year of Cu (about AUD$2m a year).

this could come from optimisation eg. from more flotation cells/better understanding of the air./reagent mixes/grinding size.

You could reasonably expect a tailings grade of about 0.2-0.3%Cu from this process. On a feed grade of 8% that would translate to a recovery of 97.5%.

Extra tonnage through the second mill is guaranteed if the mine can produce it.