Ann: Calibre Gold Resource Increases 62% to 2.1 Million Ounces, page-12

I would like to ask some silly questions!

1. The diagram on page 3 shows the resource open at depth, but Rio have been drilling for a long time and as far as I can see the holes they are drilling are all less than 500m - is there a reason they have decided not to drill some longer holes?

2. What style of mineralisation is this - is it different from a porphyry? Do we expect higher grade pods at depth, or is this not what we are going to find here? And is this definitely an open pit, or could it be an underground block cave mine too?

3. Given where the resource is still open, how much more upside could there be- could it be significantly higher, or are only incremental improvements from here likely?

4. Do we think this upgrade met, exceeded or undershot Rio's expectations? How much doubt remains whether Rio will produce here?

Ta very much!