Where, for the purposes of this Act, the traditional Aboriginal owners of an area of land are required to have consented, as a group, to a particular act or thing, the consent shall be taken to have been given if:
(a) in a case where there is a particular process of decision making that, under the Aboriginal tradition of those traditional Aboriginal owners or of the group to which they belong, must be complied with in relation to decisions of that kind--the decision was made in accordance with that process; or
(b) in a case where there is no such process of decision
making--the decision was made in accordance with a process of decision making
agreed to and adopted by those traditional Aboriginal owners in relation to
the decision or in relation to decisions of that kind.