For a mine
project like Suncor's Fort Hills, with about 25 per cent of construction already completed, the forward - looking decision would imply a return on the balance of capital invested of 12.5 per cent — now, the
project returns overall might be lower than that, but when you're considering a decision to
abandon a
partially built mine, you're not likely to get much of a return on they money you've already invested in it if you don't continue building.