OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 645 Blast holes

Subsection 645(1)

Stemming is required for conventional blast holes to confine the pressure created by a blast and to concentrate it, as needed, to break the rock.

Subsection 645(2)

In controlled blasting, a decked blasting process can be used where the explosive is alternately layered with stemming or other non-explosive material. The tops of controlled blast holes are not stemmed to allow for rapid relief of released energy, which controls and minimizes fracturing of the surrounding rock mass.