Reuters: The leading U.S. regulator for the coal industry on Friday said it suspects Wyoming officials have wrongly allowed mining companies to forego cleanup insurance. The notice begins a formal federal review by the Interior Departments Office of Surface Mining and Reclamation Enforcement. If federal officials find wrongdoing or an abuse under the law, they could assume oversight of the industry in Wyoming. Specifically, federal regulators want to know whether two now-bankrupt mining companies, Arch...