(1)If the Minister is of opinion that any special class of occurrences at mines or quarries is of so dangerous a nature as to render it expedient that notice should be given under the last foregoing section in every case thereof, he may by order extend the provisions of that section to occurrences of that class, whether death or serious bodily injury is thereby caused or not.
(2)In any proceedings taken under this Act in respect of a failure to give notice of an occurrence of any kind at a mine or quarry, being proceedings which could not be taken apart from an order under this section, it shall be a defence for the person charged to prove that he was not aware of the occurrence and that he had taken all reasonable steps for having occurrences of that kind brought to his notice,