these hold all the big guys, page-3

There was a discussion about them here a while back.
I recall that the consenus was that altough their portfolio is top notch, the exorbitant management fees will kill-off performance long-term. The discount to NTA is justifiable in my opinion.

Better to set-up (over time) a direct exposure to resources by buying BHP, RIO, WPL etc. (or even CVRD, Xstrata, Shell etc from overseas exchanges)
You are bound to at least match GMI's long-term return.