DMRE Mining Practice Test & Exam Prep | South Africa

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In a fiery mine (such as an underground coal mine), what is the maximum allowable concentration of flammable gas (methane) in the air before all charging and blasting must be suspended?

0.5% by volume 1.4% by volume 2.5% by volume 5.0% by volume

Correct Answer:

1.4% by volume

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