one of the hazards that has to be considered in the process of coal mine closure is gas, which is caused by methane emission after mining operations cease.
but coal can be a source of methane, too. the gas escapes from coal seams and is often siphoned off through ventilation systems to ensure aGet Price
the bureau of mines, reviewing the methane problem with coal-mining offi- cials, learned that faces and ribs of entries advancing into virgin coal emit more gasGet Price
methane gas is explosive when mixed with air in the range between 5 and 15 volume of gas. the 5 volume value is the lower explosive limit (lel). methaneGet Price
the project includes an open cut coal mine, an underground coal mine, a coal next stage is to test with external gas supply, then make connection to mine fan. 2009, this project will establish the quantity and quality of coal mine methaneGet Price