Notwithstanding any law or charter provision to the contrary, if a public corporation has a long-term or perpetual trust fund consisting of money and royalties or money derived from oil and gas exploration on property or mineral rights owned by the public corporation, the governing body of the public corporation may by resolution provide its investment officer with the same authority to invest the assets of the long-term or perpetual trust fund as is granted an investment fiduciary under the public employee retirement system investment act, 1965 PA 314, MCL 38.1132 to 38.1140m.