The Detour Gold mine in N Ontario is nearing completion and has a much larger and much lower grade resource than Tyhee, but its capital funding for the mine and infrastructure was arranged (@$1.45 billion) with a payback period of 6.7 years and an internal rate of return (IRR) of 14.2% before tax and an IRR of 12.4% after tax. Net Present Value 5% is $1.66 billlion before tax and $1.12 billion after tax, which are around the cost of building the mine, not counting the ongoing costs. Tyhee compares so favourably to this that it is nearly ridiculous to imagine the mine not making some significant money and, just as important, not being financed by someone with a desire to participate in the lucrative returns.

http://www.detourgold.com/files/doc_downloads/Detour%20Lake%20Gold%20Project%20NI%2043-101.pdf

http://www.detourgold.com/about-detour-gold/company-overview/default.aspx