Why would Teck want to expose the full value...?

First of all, 75% is already theirs. Every dollar of value they add to us, adds three dollars to them. Secondly, Elmer is in on the process, and although he wouldn't have the final say on where to drill, they couldn't do something willfully unproductive without his knowledge. And what would happen if they did succeed in missing the best mineralization and getting the remaining 25% cheaply, then drilled again and, surprise, there's a lot of high grade ore here after all. Would future partners trust them? What is Teck's reputation worth?