(March 12, 2018, 7:37 AM EDT) -- DENVER — A hydraulic fracturing company on March 2 filed a brief in the 10th Circuit U.S. Court of Appeals, contending that the appeal of three environmental groups regarding the U.S. Department of the Interior’s (DOI) sale of oil and gas leases is “moot.” Specifically, the company says that the DOI followed federal law when it conducted the lease sale (Southern Utah Wilderness Alliance, et al. v. U.S. Department of the Interior, et al., No. 17-4134, 10th Cir.)....