It's not just a question of operating costs. The same group of QP's also completed a prefeasibility study on the QR Mine. The reality wasn't even close to expectations. Grade came in substantially lower than projected. I believe it was about a third less. Process recoveries were also much lower than near ideal conditions described by the study. Prefeasibility is just that, a preliminary guesstimate. A bankable feasibility study is more reliable. The QR Mine still hasn't made the company any income.The Bonanza Ledge prefeasibility was completed around the same time as QR. Will it work out this time for Bonanza, where it hasn't failed to meet expectations for QR?The proof is on the bottom line of the financial statements, not in a flurry of optimistic modelling.