A second northwestern Colorado coal mine will undergo a review of the mine's environmental impact following an agreement reached by the federal government, the mine's owners and WildEarth Guardians.. The agreement between the U.S. Department of Interior’s Office of Surface Mining (OSM), Trapper Mining Inc. and WildEarth Guardians was filed Thursday with the U.S. District Court in Denver. The agreement gives the federal government until the end of April to complete a new review of the mine’s operations. ... Our miners must be allowed to keep working to supply Craig Station with the coal that’s needed to supply the grid...