Transporting 6 workers from the Bobbie Burns lodge when the engine lost power. The pilot carried out an emergency landing to an area of new growth trees. The landing with low rotor rpm was hard, but the helicopter stayed upright. The tail section of the helicopter was struck by a main rotor blade and severed. The pilot and 2 passengers had no injuries, 3 passengers had minor injuries and 1 incurred a serious injury. CADORS 2015P1390