BILLINGS, Mont. (AP) — The Crow Tribe is expected to sign an agreement today giving a Wyoming mining company rights to lease an estimated 1.4 billion tons of coal beneath the tribe's southeastern Montana reservation. The deal with Cloud Peak Energy involves more coal than the U.S. consumes annually. It would revive stalled efforts to expand mining on the impoverished, 2.2 million-acre reservation and appears aimed at tapping into coal export markets.