TT, well, what are they then? Bear in mind I am talking about...

TT, well, what are they then? Bear in mind I am talking about production cash costs here. Which of these costs are not variable?

Excavators.
Trucks.
Electricity for crushing.
Electricity for conveying.
Repairs on all the above.
Cyanide.
Merrill-Crowe circuit electricity.
Power for smelting.

Every ounce produced uses more of the above.

Some production salaries will be fixed. That's it, I think.

It all comes down to grade, recovery and strip ratio. Regardless of those factors, the first five costs will be constant, as they are dependent on tonnes mined/stripped.