RE: Details of buy back24 Aug 2022 20:03
Howezap, I think your argument is flawed. Firstly, it is only the original 71Mt resource (@0.3% cut-off) that has been measured at 0.44%. That gives about 0.3Mt of Cu. Then we already know that dropping from a 0.3% cut-off to 0.15% for that same resource adds an extra 0.1Mt of Cu, to give 0.41Mt. That’s from the published open-pit modelling July 2021. (That resource then averages about 0.295% btw).
Since then, hardly any assays have been around the 0.4% mark. Any significant runs of mineralization have been lower - 0.2%, 0.3%, etc. So it’s simply not possible to get to 0.44% overall for the whole of RC. In fact I’d be very surprised if we weren’t at 0.2-0.25%, allowing for the “averaging down” effect of the lowest grade ore (0.15% etc).
I also wouldn’t be surprised to see the 20Mt x 25 year statement from CB turn out to be 25Mt x 25 - because it’s financially beneficial to crunch through rock at a faster rate. I think it’s quite possible that 625Mt is down there, given the 0.15% cut-off. You are quite right, of course, to say overall tonnage of Cu is the most important thing, provided the low grades don’t make it economically unviable.