3. The Minister may, by notification in the Gazette —
(a)
declare any house, building, enclosure or place, or any part thereof, to be a prison for the purposes of this Act for the imprisonment or detention of persons lawfully in custody;
(b)
define which prisons shall be used for the custody of particular classes of prisoners;
(c)
declare that any prison shall cease to be a prison; and on the publication in the Gazette of such declaration, or from and after any later date specified therein, that prison shall cease to be a prison; and
(d)
declare any prison, house, building, enclosure or place, or any part thereof, to be a reformative training centre for the detention of persons sentenced to reformative training.