$800/oz costs? $50m? Only 450koz? If those figures are true and management moves ahead any time soon, I'll have to re-evaluate their intelligence.
They'll need a much bigger cushion with the gold price. At $1000 gold, they'd only make $40m over 12 years. If you discount that it looks terrible. The return over the life of the mine is not enough to make it worth doing. Do the math.