An area of land is an approved site for the purposes of Part 19 if—
(a)it is identified in a grant of planning permission or any instrument by virtue of which planning permission is deemed to be granted, as land which may be used for development described in this Part; or
(b)in any other case, it is land immediately adjoining an active access to an underground mine which, on 5th December 1988, was in use for the purposes of that mine, in connection with the purposes described in paragraph A.1(b)(i) or (ii) or paragraph B.1(b)(i) to (iii) above.