In D.C. Circuit Court filings quoted by Bloomberg News, the act doesn’t “remotely grant EPA a retroactive trump card,” argued the unit, Mingo Logan Co., claiming the decision blocked $250 million in investment and 200 job losses. EPA officials first signed off on the Spruce No. 1 mine project in 2007, but changed course after new information emerged.

The St. Louis-based Arch Coal enjoyed a broad support, including that of the U.S. Chamber of Commerce, a West Virginia-led 27 state coalition and the National Mining Association (NMA). “The court allows uncertainty and companies will lack assurance to create jobs,” said Hal Quinn, CEO of the Washington-headquartered NMA.