6.—(1) All detonators at an explosives store or at a place appointed in pursuance of paragraph (2) of regulation four shall be in the sole charge of the manager of the mine except—
(a)during a shift for which the manager has appointed a competent person to have charge of that store or place;
(b)during any other period, in any case in which there is no means of entry to that store or place otherwise than through a doorway or doorways having a door or doors which can be securely locked and the manager has made such arrangements as to secure that that door is or those doors are kept securely locked throughout that period.
(2) No person shall be in possession of any detonator at any place at a mine other than an explosives store or a place appointed for the storage, issue or deposit of explosives except a shot firer to whom the detonator has been issued for use or a person authorised in writing by the manager of the mine so to be and save as aforesaid no person shall issue or take any detonator from such a store or place.