The Secretary of the Interior is authorized to purchase for the use and benefit of the Papago Indians with any available funds heretofore or hereafter appropriated, pursuant to authority contained in section
465 of this title, all privately owned lands, water rights, and reservoir site reserves within townships 18 and 19 south, ranges 2 and 3 west, together with all grazing privileges and including improvements upon public lands appurtenant to the so-called Menager Dam property, at the appraised value of $40,016.37.