4.—(1) In regulation 3(3), for sub-paragraphs (c) and (d) there shall be substituted—

“(c) the exploration, extraction and processing of minerals in mines, quarries or by means of boreholes, except—

(i) chemical and thermal processing operations; and

(ii) storage relating to those operations,

which involve dangerous substances; and

(d) waste land-fill sites, except tailing ponds or dams and other operational tailings disposal facilities containing dangerous substances, in particular when any such facilities are used in connection with the chemical and thermal processing of minerals.”.

(2) Regulation 3(4) shall be revoked.