Ann: Additional Data on Sulphide Abundance, page-47

It's a predictive tool. Knowing what the typical tenor range of a type of nickel deposit is for 95% of global deposits of that style means that when someone tells you how much sulphide they have, you can have a fairly certain guess at how much nickel they are going to get out of that sulphide when the assay results come back.

So for 2% sulphides I'm having a guess at how much nickel is going to come back in the assays. My guess is that it won't be as much as 0.6% based on what the typical tenor for these types of systems around the world tells me.

That's why you do it.