(1) The Authority may, after having advised the Minister of its intention to do so, request the Director-General to investigate and report to it on any proposal that land should be declared to be a park or part of a park, or acquired for national park purposes.
(2) Unless the Authority otherwise agrees, the Director-General shall, on receiving any such request—
(a) Give notice of the proposal under investigation by advertisement published in daily newspapers circulating in the cities of Auckland, Hamilton, Wellington, Christchurch, and Dunedin, and in the area affected; and
(b) In that notice invite persons and organisations interested to send to the Director-General written suggestions on the proposal under investigation.
(3) The Director-General shall, on receiving any such request, give notice to the Minister of Energy of the proposal under investigation.