The Oglala Sioux Tribe may convey and the Secretary of the Interior may acquire not to exceed forty acres of tribally owned lands on the Pine Ridge Indian Reservation for the purpose of erecting thereon permanent facilities to be used to interpret the natural phenomena of the park and the history of the Sioux Nation: Provided, That no such conveyance shall be made until sixty days after the terms thereof have been submitted to the Interior and Insular Affairs Committees of the House of Representatives and the Senate.