(2)
In particular, and without prejudice to the generality of the foregoing power, such rules may provide for all or any of the following matters, namely:-
(a) the manner in which, the [mineral oils] [Substituted by Act 67 of 1957, Section 32 and Schedule III, for " minerals " (w.e.f. 1.6.1958). ]
(b) the authority by which, the terms on which, and the conditions subject to which, mining leases may be granted;
(c) the maximum or minimum area and the period for which any mining leases may be granted, and the terms on which leases in respect of contiguous areas may be amalgamated;
(d) the fixing of the maximum and minimum rent payable by a lessee, whether the mine is worked or not.