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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
corte tranversal
Mining; Coal
Uma entrada horizontal que geralmente é perpendicular ao poço e ao veio de carvão
detectores
Mining; Coal
Aparelhos ou instrumentos utilizados para detectar a presença de gases específicos em uma mina.
desenvolvimento da mina
Mining; Coal
A preparação da mina para o início da extração, incluindo o abertura de túneis e cortes transversais.
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