21. The operator of a quarry or sand pit must, until the permanent cessation of the mining of surface mineral substances, identify with visual signs or markers at least 1.5 m high,
(1) the limits of the quarry or sand pit; and
(2) the maximum depth for the operation of the quarry or sand pit.
In the case of a quarry or sand pit established or enlarged as of 18 April 2019 that is not located on lands in the domain of the State, the operator must cause the limits of the quarry or sand pit to be identified by a professional having the required qualifications in land surveying and cause a plan to be prepared by the land surveyor indicating the geographical coordinates
(1) of the limits of the quarry or sand pit, specifying each of the apexes;
(2) of placed marks or markers;
(3) of any dwelling or of any public institution located below
(a) 600 m from a quarry; and
(b) 150 m from a sand pit; and
(4) of any site referred to in sections 13 to 19 for which a distance is prescribed.
Not later than 1 year after the plan referred to in the second paragraph has been prepared, the operator must send it to the Minister.
Subparagraph 2 of the first paragraph does not apply to a sand pit referred to in section 9 for which the operator made a declaration of compliance.
This section does not apply to a quarry or sand pit established before 17 August 1977.