OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 670 Stemming

Subsection 670(1)

Stemming prevents expanding gases created by blasting from escaping the hole. This focuses the blast energy where the rock needs to be broken. Non-flammable stemming materials are used to reduce the possibility of secondary coal dust and methane explosions.

Subsection 670(2)

Where water stemming is used, clay stemming is required to prevent the water from coming into contact with the explosive and rendering it ineffective. Two separate packings of water ensure at least one will work if the other leaks away.