4.—(1) Subject to paragraph (2), these Regulations shall apply to all quarries where persons work.
(2) These Regulations shall not apply to any—
(a)quarry at which there has been no extraction or preparation for sale of minerals within the previous twelve months;
(b)quarry in relation to which notice of abandonment or ceasing of operations has been given to the Executive in accordance with regulation 39(1), provided that the quarry is no longer being used for the extraction or preparation for sale of minerals; or
(c)part of a quarry which is being used exclusively by a person for a work activity unconnected with—
(i)the extraction of minerals; or
(ii)the preparation for sale of minerals,
provided that no work activity set out in paragraph (3) is being carried on at that quarry.
(3) The work activities mentioned in paragraph (2) are any work carried on—
(a)with a view to abandoning that quarry; or
(b)for the purpose of preventing the flow from that quarry into an adjacent quarry of water or material that flows when wet.
(4) These Regulations shall apply to a self-employed person as they apply to an employer and as if that self-employed person were both an employer and a person at work.