Section 151(3) in The Coal Mines Regulations, 2011
(3)Where it is intended to carry out any exploratory work in a mine or part belowground likely to contain irrespirable atmosphere, -(a)all work shall be done under rescue cover only;(b)no party of less than three persons shall be allowed to proceed to carry out such work; and(c)every such party shall carry a cage containing suitable birds or other means of detecting carbon monoxide gas approved by the Chief Inspector and also an approved flame safety lamp.
