IRR is incredibly important in financial analysis. It is a measure of the quality of return on initial capital investment.
Ahh so thats what you mean, given its not in production, how can you judge the rate of return. For a speculator are you looking for a rise in share price or are you predicting on a prediction, ergo speculating on the IRR.
As far as CPC ( Commodity Price change... by the way I made up that acronymn ) Chestermemate hits the nail on the head. Perhaps BHP have got it all wrong as well.
RXM Price at posting:
71.0¢ Sentiment: ST Buy Disclosure: Held