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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 ?
Sewage Gas and Mine Gas Facilities in euro cents/kWh, 2004-2009 33
The Authority has a requirement for a 10 year contract to manage, operate and maintain its mine water, mine gas and other environmental assets/facilities.
Yichang, Dhu-AlHijjah 19, 1432, Nov 15, 2011, SPA -- Six people have been confirmed dead in a coal mine gas leak in central China's Hubei Province Tuesday afternoon, local authorities said.
Beijing, Oct 17 (ANI): The death toll from Saturday's coal mine gas leak in Central China's Henan Province climbed to 26 on Sunday with rescuers still battling to reach the eleven miners, who are still trapped inside.
Conditions imposed on the go-ahead will include a scheme to protect the buildings from ingress of mine gas from old mine workings, a flood evacuation plan and flood warning notices.
Alternative fuels such as landfill gas, biogas, methane, mine gas, and bio-diesel are already being used in generator sets in the European Union (EU).
They will operate and maintain the Authority s 82 mine water treatment schemes, pumping stations and mine gas facilities in Britain, plus new schemes to be built in the future.
Summary: Lanzhou, May 11, 2010, SPA -- A coal mine gas leak left nine people dead in northwest China&'s Gansu Province Tuesday, local authorities said.
TOKYO, Nov 21 (KUNA) -- The death toll from a coal mine gas explosion in
It has now secured contracts for the London Underground and Coal Mine Gas Recovery worth pounds 1.
GE's Coal Mine Gas Engines to be Installed at New Power Plant in First Quarter 2009
These include the cable and pipe runs, (operating and non-operating) to have drainage systems, pumping stations, mine gas extraction and activities outside the statutory requirements (Deep Foundations, rehabilitation beneath a foundation level);