Mine gas drainage is the deliberate process of capturing and removing hazardous gases trapped within a coal seam or the surrounding rock strata before, during, or after underground mining operations.

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When coal is formed over millions of years, these gases are trapped inside the coal matrix under intense pressure. As mining machines cut into the coal, that pressure drops, releasing the gas into the mine workings.

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Without targeted drainage, these gases would escape directly into the mine air, posing catastrophic safety risks and forcing operations to stop.