# The Miscellaneous Mines Order 1956, Paragraph 79


No person shall descend any shaft or staple-pit which is not ordinarily used by any person, unless it has been ascertained, by the lowering of a flame lamp or otherwise, that it does not then contain any dangerous concentration of noxious gas.

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Source: https://www.legislation.gov.uk/uksi/1956/1778/schedule/FIRST/paragraph/79 (the official version)
Page: https://openlegislation.uk/miscellaneous-mines-order-1956/schedule-FIRST/paragraph-79
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.