Chapter Precautions against external dangers to workings S.78 rep. by SR 1980/333 75Duty of mine owners and managers to seek evidence of proximity of disused workings, water-bearing strata, &c. 76Duty of mine owners and managers to ascertain thickness of strata between workings and surface water. 77General duty to take precautions against inrushes of gas, water, &c. Chapter