Coal industry representatives say lawsuits against mines in three Western states, including Trapper and Colowyo Mines in Colorado, could have consequences across the U.S. as environmentalists seek changes in how mining is approved on federally owned reserves. In civil cases unfolding in Colorado, New Mexico and Montana, the group WildEarth Guardians asserts coal companies benefited from lax oversight by federal regulators. The group says the U.S. Department of Interior approved mining plans without enough public involvement, and gave little heed to the pollution caused by digging, shipping and burning coal. The group asked the courts to stop mining until the plans are re-done. The cases involve the San Juan coal mine in New Mexico, the Colowyo and Trapper mines in Colorado, and the Spring Creek mine in Montana. Combined, they employed about 1,200 workers and produced 27 million tons of coal last year, according to federal records. Attorneys for the federal government denied the environmentalists’ claims and have asked the courts to dismiss the cases. More detailed briefs from the government are due in coming weeks. A fourth case involving several mines in Wyoming was voluntarily dismissed.