# The Stratified Ironstone, Shale and Fireclay Mines (Explosives) Regulations 1956, Regulation 20


(1) No person shall begin to charge any shot hole unless it is thoroughly cleaned out.
(2) No person shall use compressed air to clean out any shot hole unless he ensures that the giving off of any dust is minimised.

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Source: https://www.legislation.gov.uk/uksi/1956/1943/regulation/20 (the official version)
Page: https://openlegislation.uk/stratified-ironstone-shale-and-fireclay-mines-explosives-regulations-1956/regulation-20
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.