Sec. 85.59.  EXPLORATORY TERM;  EXTENSION;  OTHER PROVISIONS OF LEASE.  (a)  The exploratory term of the lease as determined by the board prior to the promulgation of the advertisement shall in no case exceed five years, and each lease shall provide that the lease will terminate at the expiration of its exploratory term unless by unanimous vote of members of the board the lease may be extended for a period of three years.  The lease may be extended if the board finds that there is likelihood of oil, gas, sulphur, mineral ore, and other minerals being discovered by lessees, and that the lessees have proceeded with diligence to protect the interest of the state.  However, if oil, gas, sulphur, mineral ore, and other minerals are being produced in paying quantities from the premises, the lease shall continue in force and effect as long as the oil, gas, sulphur, mineral ore, and other minerals are being so produced.  No extension under this subsection may be made by the board until the last 30 days of the original term of the lease.
(b)  When, in the discretion of the board, it is deemed for the best interest of the state to extend a lease issued by the board, the board by unanimous vote may extend the lease for a period not to exceed three years, on the condition that the lessee shall continue to pay yearly rental as provided in the lease and any additional terms the board may see fit and proper to demand.  The board may extend the lease and execute an extension agreement.
(c)  The lease shall include any additional provisions and regulations the board may prescribe to preserve the interest of the state, not inconsistent with the provisions of this subchapter.
Acts 1971, 62nd Leg., p. 3197, ch. 1024, art. 1, Sec. 1, eff. Sept. 1, 1971.