Any person causing an explosion whereby life or property is endangered shall be guilty of an offence and liable on conviction to the following penalties, according as the explosion was negligently or wilfully caused; that is to say -
(a) if the explosion is negligently caused and property is endangered, he shall be liable to a fine or to imprisonment for a period not exceeding four years;
(b) if the explosion is negligently caused and life is endangered, he shall be liable to a fine or to imprisonment for a period not exceeding four years;
(c) if the act or omission causing danger to life or property is wilful, he shall, where death does not result therefrom, be liable to imprisonment without the option of a fine for a period of not less than three years and not more than fifteen years, and the explosives and any apparatus or conveyance used in connection with or involved in the act or omission may be declared to be forfeited;
(d) if the explosion is negligently caused and death results, he shall be liable on conviction to a fine or to imprisonment for a period not exceeding six years.