Section 145(1)(c) in The Coal Mines Regulations, 2011
(c)where the outlets or openings of the seam are within 60 metres of an active fire or spontaneous heating in a higher seam or on the surface in any ash heap or spoil heap or in any other heap or place or any other fire or spontaneous heating which cannot be controlled immediately or where broken ground connected with the seam exists within 60 metres of such fire or spontaneous heating; or