RE:Mineral Rights Compensation Regulation, Alta Reg 317/2003 There is no compensation written into the law for getting more than they spent.
That said, its pretty clear cut that they will be compensated for what they have spent, plus interest. However, some of the $51 mm is share-based compensation, G&A, and warrant value. I assume that the government will not pay for those expenses. Excluding those costs, I get ~$46 mm of spending, which equates to $56 mm with interest (at 5%).