Thanks CPDLC, it is much appreciated.
So just to make sure I'm reading this correctly, the Ev/t does not include associated costs, which could significantly alter ranking, especially if you take into consideration the differences between open-cut and underground mining costs.
It appears that you've done your fair share of research and I commend you for your efforts.
Good luck with the results!
:-)
a possible future...?, page-23
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