ROCK SPRINGS, Wyo. (AP) — The U.S. Bureau of Land Management Rock Springs Field Office is seeking public comment on what issues to address in an environmental study of a coal company's proposal to expand its underground mining operation by 320 acres.

The Bridger Coal Company proposes to expand its mine into land adjacent to the mine's current permit boundary. The permit covers nearly 27,000 acres about 35 miles northeast of Rock Springs. The company also plans to conduct new underground mining on private land.

Bridger Coal Company operates the Jim Bridger Coal Mine, which has been in production since 1974. Public comments are due to the federal agency by May 2.