PART XXIX UNDERGROUND OPERATIONS — Boreholes in advance of working face
601
Where a workplace in a mine approaches abandoned or other workings which cannot be inspected and in which there is or could be an accumulation of water, the employer shall
601(a)
ensure that boreholes are kept at least 6 metres ahead of the working face; and
601(b)
take those additional measures as are considered necessary by the employer or the minister to preclude a sudden breakthrough of water.
Not legal advice. Verify the cited article against the signed agreement.