Mine Health and Safety Act 2004 No 74
Current version for 1 January 2014 to date (accessed 21 December 2014 at 17:11)

82   Defence

A person is not guilty of an offence against this Division for a contravention of a requirement relating to the time for which persons were employed underground if the person proves that there were special circumstances to render the contravention necessary for the safe and proper working of the mine and that the contravention did not create an increased risk of injury to the persons so employed in the mine.
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