After-tax IRR of 13.9% ??NOT GOOD!! I expected a little higher but not that weak! Niobec cancelled their expansion plans a couple of days ago based on an IRR of 15%. And thats a cdn $ OPEX! The only viable deposit with better economics on the radar now is Niocan (v.NIO) with an after-tax IRR of +/- 34%, cdn $ OPEX and a CAPEX of only $200 million!