Mealey's (April 6, 2022, 11:47 AM EDT) -- DENVER — The U.S. Department of the Interior (DOI) on April 5 filed a brief in the 10th Circuit U.S. Court of Appeals contending that it should dismiss as “unripe” the appeal of a hydraulic fracturing company that says the DOI acted “arbitrarily” when it passed a rule that would require the company to pay royalties based on what is known as the Index Based Major Portion (IBMP) formula....