홈 > Term: graded coal
graded coal
One of the three main size groups by which coal is sold by the National Coal Board in Great Britain. It consists of coal screened between two screens--with an upper and lower limit ranging from a top size of 1-1/2 to 2 in (38 to 51 mm) to a bottom size of 1/8 to 3/4 in (3.2 to 19 mm).
- 품사: noun
- 분야/도메인: 광업
- 카테고리: 일반 광산; Mineral mining
- Government Agency: USBM
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- ed.young
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(Milwaukee, United States)