Because I've predicted Tritton production will increase by 12.5%...

Because I've predicted Tritton production will increase by 12.5% with little increase in costs to achieve that, so more production means lower AISC.
A better question would be why am I predicting a 12.5% increase in production - because it is high time that Tritton started producing up to its expectations - it did produce 5400t in the Jun23 quarter and should at least match that going forward - the yearly guidance target for Tritton was set way too low IMO given the amount of development dollars spent there last FY.