Coal output in the U.S. by type 1800-1985

Bituminous hard coal has historically been the most produced coal type in the United States. Growing from just 98,000 metric tons produced in 1800, total coal output reached over 800 million metric tons by 1985. Hard coal was mined more than any other coal type.

硬煤（Hard coal）在美国历史上一直是产量最大的煤种。自1800年仅有98,000公吨的产量起步，至1985年，煤炭总产量已突破80亿公吨。硬煤的采挖量超过了其他所有类型的煤炭。