Section 106(5) in The Coal Mines Regulations, 2017
(5)The height of benches in coal and overburden of rock formation other than that mentioned in sub-regulation (4) shall not be more than the digging height or reach of the excavation machine in use for digging, excavation or removal, and the width thereof shall not be less than -(a)the width of the widest machine plying on the bench plus two meters; or(b)if dumpers ply on the bench, three times the width of the dumper; or(c)the height of the bench,whichever is more.
