# The Mines (Control of Ground Movement) Regulations 1999, Paragraph 10


In the case of roadways where rockbolts are used as the principal support–
(a) the minimum density of rockbolts in the roof shall be 1 bolt per square metre;
(b) the minimum length of rockbolt in the roof shall be 1.8 metres; and
(c) the maximum distance between the last completed row of rockbolts and the face shall be 3.5 metres.

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Source: https://www.legislation.gov.uk/uksi/1999/2463/schedule/paragraph/10 (the official version)
Page: https://openlegislation.uk/mines-control-of-ground-movement-regulations-1999/schedule/paragraph-10
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.