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see dampdamp,
in mining, any mixture of gases in an underground mine, especially oxygen-deficient or noxious gases. The term damp probably is derived from the German dampf, meaning fog or vapor. Several distinct types of damp are recognized.
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a combustible gas released usually in coal mines, less often in salt, metal-ore, and sulfur mines. Firedamp is colorless, lighter than air (since it consists mainly of methane), and contains nitrogen, neon, argon, hydrogen, and carbon dioxide and traces of ethane, propane, ethylene, and other hydrocarbons. In mineral deposits it results from the decomposition of organic substances caused by microorganisms, heat, pressure, and sometimes radiation. When the content of firedamp in the air is from 5 to 16 percent (as measured by methane content), the mixture produced can be ignited by a flame or sparks and cause explosions and fires.

Permissible firedamp concentrations range from 0.5 to 2 percent. The explosive accumulation of the gas is lowered by mine ventilation. Special safety lighting and electrical equipment is used to prevent firedamp from igniting. Firedamp in a mine atmosphere reduces the concentration of oxygen, which may lead to suffocation.


(mining engineering)
A gas formed in mines by decomposition of coal or other carbonaceous matter; consists chiefly of methane and is combustible.
An airtight stopping to isolate an underground fire and to prevent the inflow of fresh air and the outflow of foul air. Also known as fire wall.
References in periodicals archive ?
mine gas blast in southwest China's Sichuan Province, state-run Xinhua News
Bekin, March 28 (BNA) -- Eight workers were killed and three injured in a coal mine gas leak in southwest China's Guizhou Province early today, local authorities said.
Last Thursday, Xinhua reported that at least one miner died and another six were trapped underground after a coal mine was flooded in eastern province of Fujian, while five people died in a coal mine gas leak in southwestern China's Chongqing Municipality.
UNITED Utilities has appointed Douglas Coleman as managing director of the Warrington-based group's renewable energy operation, which involves hydro-electric generation, wind farms and landfill and mine gas generation.
The new operation, located in Grand Junction, Colorado, will provide both distance and on-site service and maintenance for all Conspec mine gas sensing products and systems to coal operators in Colorado, Montana, New Mexico, Utah and Wyoming.
Chuangchun, Jumada I 25, 1434, Apr 6, 2013, SPA -- The death toll from a coal mine gas explosion on March 29 in northeast China's Jilin Province has risen to 36 after seven more deaths were reported by local authorities on Saturday.
FEARS that a major housing development will put local people at greater risk from a potentially lethal mine gas are to be investigated in detail by experts.
Beijing,Nov 11(ANI): At least 43 people have been trapped underground in a coal mine gas leak in southwest China's Yunnan province.
At least 203 miners were killed in a coal mine gas explosion Monday afternoon in northeast China, the official Xinhua News Agency reported Tuesday.
BEIJING - At least 203 miners were killed in a coal mine gas explosion Monday afternoon in northeast China, the official Xinhua News Agency reported Tuesday.
Tenders are invited for Procurement Of 20 Point Automated Tube Bundle Mine Gas Monitoring System For Adriyala Longwall Project From M/S Simtars, Australia