Prevention of flammable gas and coal dust explosions in collieries

Prevention of flammable gas and coal dust explosions in collieries

sample analysed by laboratory method. The corrected total incombustible content is equal to M+I (100 - M/100) where M is the percentage loss of mass during air- drying and I is the percentage of total incombustible matter in the dust as determined by the method described in the preceding paragraph.

1.5. Keeping of records

1.5.1. The certificates showing the quality of stone dust supplied to the mine must be retained for two years; and

1.5.2. A record of the stone dust sampling analysis must be kept for two years of the date, places sampled and results of the analysis of the mine dust sampling program. Failure of more than 20% of the number of samples of a given area is unacceptable and requires immediate remedial action. Resampling of the sub-standard area must be done after corrective action was taken and the records must be retained for two years.

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