OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 654 Drilling near explosives

Subsection 654(1)

For the reasons explained in section 653(2), drilling near a charged blast hole is very dangerous. The minimum 5 metre distance from a charged blast hole must be maintained.

Although 5 metres is the minimum distance for surface blasting, care must be taken to ensure that cracks or fissures in the surrounding rocks do not contain explosives as well.

Subsection 654(2)

A cut-off hole is a charged blast hole in which detonation was not completed i.e. cut-off, leaving behind live explosives. Prior to any drilling activity, the area must be examined by a mine blaster.