black coal

Noun

countable uncountable

high-quality coal / (nontechnical) coal

Japanese Meaning

上質な石炭 / 一般的な意味での石炭

The export company insisted on shipping only black coal, prized for its high calorific value.

その輸出会社は、発熱量が高く評価される高品質の石炭だけを出荷すると主張した。

Sense（1）

high-quality coal

The drop in 1918 was also a fall in the production of black coal. In other words he losses were in the best coal, the gains in the poorer coal

Sense（2）

(nontechnical) coal

black coals

（ plural ）