PART XXXII OPEN CUT WORKINGS IN MINING OPERATIONS — Protection of workings, pits and quarries
654(b)
the approaches to and openings of the working are not readily visible; or
654
An employer shall ensure that a surface mine working or open face is securely fenced or otherwise protected against inadvertent entry by persons where
654(a)
the working constitutes a hazard by reason of its depth;
654(c)
the hazard caused by the working is greater than the hazard caused by natural topographical features within 600 metres of the working.
Not legal advice. Verify the cited article against the signed agreement.