Article 20 1

1.   For underground coal mines, mine operators shall take continuous source-level direct measurements and quantification on all exhaust ventilation shafts. Mine operators shall report to the competent authorities methane emissions per ventilation shaft per year in kilotonne of methane, using equipment and methodologies resulting in a measurement accuracy with a tolerance of 0,5 kilotonne of methane per year or of 5 % of the reported amount, whichever value is lower.