Annualised at current quarterly production (3000 tonnes)every 1c rise in Cu adds $264,000 to AVLs bottom line. This is 0.3c per share
Annualised at Stage II production levels (20,000 tonnes) every 1c rise in Cu adds $440,000 to AVLs bottom line. This is 0.5c per share
Multiply these figures by whatever P/E ratio you consider fair and there you have the theoretical impact on share price.
Naturally any calculation of share value would also have to give a value to known reserves for future expansion such as Kapulo (this will impact the P/E multiplier you use above).