(April 30, 2018, 1:20 PM EDT) -- DENVER — A federal judge in Colorado on April 18 granted the federal government’s early motion for summary judgment, finding that two defendant companies in a cost-recovery action brought under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) are corporate successors to mining companies that conducted operations at the Commodore Waste Rock Pile Superfund site (United States v. Pioneer Natural Resources Co., et al., No. 17-cv-0168-WJM-NYW, D. Colo., 2018 U.S. Dist. LEXIS 65256)....