TORONTO, ONTARIO — (Marketwire) — 05/24/12 — Energy Fuels Inc. ("Energy Fuels") (TSX: EFR) and Denison Mines Corp. ("Denison") (TSX: DML)(NYSE MKT: DNN) are pleased to announce that the companies have entered into a definitive arrangement agreement (the "Arrangement Agreement") with respect to the previously announced transaction (the "Transaction") whereby Energy Fuels will acquire all of the shares of the subsidiaries holding Denison-s U.S. mining a