"What sort of oxide/sulphide blend do you reckon they can...

"What sort of oxide/sulphide blend do you reckon they can achieve without rusting the plant out?"
Now that is a rubbish question. The plant was built for treating Sulphide and sulphide will not rust the plant out. Sure, some of the processes can convert the sulphides to acid but these areas are stainless steel and/or protected. The acid needs to be quickly neutralised or you will have a serious problem in the leach circuit with the production of hydrogen cyanide gas.
The other major factor is that there is no sulphide feed as yet - all oxide or free milling (Golden Age).
Am amazed at the number of people who invest in stock but have little or no understanding of what they actually do