Section 146(10) in The Coal Mines Regulations, 2011
(10)If the average concentration of respirable dust in a series of 5 samples taken in 7 successive normal working shifts during the subsequent month exceeds one and a half times the permissible limit, the relevant operation or operations causing excessive dust shall be stopped and the operation or operations shall not be resumed or allowed to be carried on until improvements have been made in the prevention and suppression of dust and fresh sampling carried out immediately on resumption of the said operation or operations has established that such improvements have reduced the dust concentration below the permissible limit:Provided that if the dust prevention and suppression device of any machinery or equipment fails to operate efficiently, the operation of the said machinery or equipment shall likewise be stopped and shall not be resumed until the defect therein has been rectified:Provided further that, purely as a contingency measure or as a secondary means of protection in a work situation wherein it is technically not feasible to reduce the respirable dust concentration below the permissible limit or during the time period necessary to install and commission any device or to institute any new, work practice for dust prevention or suppression, compliance with the permissible limit of dust may be achieved by remote operation or by job rotation and failing which by the Use of suitable dust respirator.
