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OZ, ref. the amount of nickel at the Santa Rita Mine...

This is an extract from Mirabela's Prospect:

"Santa Rita Mineral Resources

Mirabela has total in-pit mineral resources of 198Mt at an average grade of 0.52% and additional underground resources of 87.5 Mt at an average grade of 0.79%."

Hence, they are talking 198 million tonnes of Nickel Sulphide (in-pit mineral or raw mineral, as you say). At 0.52% Nickel content, we come to approx. 1 million tonnes of concentrate, which at US$14.600.00 per tonne makes a total of US$14.6 billion (at today's nickel price) ...

I wasn't even counting this extra bit, but there is an additional underground resource of 87 million tonne of sulphide, which again totals over an extra 1 million tonnes of concentrate, or another US$ 14.6 billion.

As per my understanding:

In the ground it is Nickel Sulphide. Once mined and processed it becomes Nickel concentrate which is 100% Nickel which once processed, thru the smelter, becomes the metal itself.

Just for comparison, the Royal Nickel Corporation, in Canada, has Nickel Sulphide at 0,27% which makes their total Nickel Concentrate reserve of over 3 million tonnes.