OHS Code Explanation Guide

Published Date: July 01, 2009
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Part 36 Mining

Section 741 Roof bolting

Subsection 741(1)

Although roof bolting may not encounter as much flammable gas as coal cutting operations, the presence of flammable gas at the drilling location can be dangerous. As a result, monitoring for combustible gases such as methane by a competent person is equally important in this situation.  Gas readings must be taken at roof level because some combustible mine gases, like methane, are lighter than air and hence rise, so they will be present at higher concentrations near the roof than elsewhere.

Subsection 741(2)

If methane levels are measured at 25 percent of the lower explosive limit (1.25 percent of methane), all roof bolting activity must cease until ventilation is improved and methane levels are consistently measured below 25 percent of the LEL.

Subsection 741(3)

Many of the new bolters have methane monitors mounted on them, often with a continuous monitoring capability.