143Variation, revocation, and c., of regulations
(1)General regulations may—
(a)be varied or revoked by subsequent general regulations ;
(b)be rendered wholly or partly inapplicable, or varied in their application, to a particular mine or quarry by special regulations applicable thereto.
(2)Special regulations may be varied or revoked by subsequent special regulations and may be revoked by general regulations, and a provision of general regulations which revokes special regulations shall be deemed not to be a special regulation.