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How can methane released from coal beds cause mine fires and explosions?

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coal utilization Cross-regenerative coke oven. (A) Cross section, showing the alternating arrangement of flue walls and ovens; (B) longitudinal section, showing (left) a series of combustion flues in a single flue wall and (right) part of a long, slotlike oven.

Methane, often referred to by miners as firedamp, is a gas naturally trapped within coal seams. During mining operations, this gas is released from the coal into the mine atmosphere.1234

The primary danger arises because methane is highly flammable and explosive when mixed with air in concentrations between 5 and 14 percent by volume. If this mixture is accidentally ignited—for example, by a spark or an open flame—it can cause severe mine fires and explosions, which have historically been the source of many mining disasters.234

To mitigate these risks, the industry has historically employed safety lamps to detect the presence of firedamp, as the flame of such a lamp elongates when the gas is present. Modern mining operations also utilize techniques like fracking to extract methane from coal beds prior to mining, which is intended to improve safety by reducing the amount of gas released during the extraction of coal.514