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Coal
Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as anthracite coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon along with variable quantities of other elements, chiefly hydrogen, sulfur, oxygen, and nitrogen.
Industry: Energy
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Coal
room and pillar mining
Mining; Coal
A tactic of underground coal mining where large pillars are left behind to provide support and rooms of coal are mined.
safety fuse
Mining; Coal
Used to delay a detonation, they are made from black powder inside a tube that's coated with a waterproofing agent.
safety lamp
Mining; Coal
A lamp used in mines with a covering that allows for enough air to keep its flame lit, but will not ignite dangerous gasses, such as methane, that can be found in mines.
