about separation at wilgar, look at it by analogy.
If I told you that you had a 10 million litre tank of raw sewerage and there was a billion dollars in it, I think you would be happy to spend 900 million getting the 100 million.
Bottom line as I think Process said, minimg isn't about rock collecting, think "mining money", if there is a buck left at the end its all good. All a question as to what the end is.
Value = sales - digging up cost - processing cost.
We can estimate the first two, your question is valid on the last but experts will soon advise.
CDU Price at posting:
$3.42 Sentiment: Hold Disclosure: Held