On 1 September 1990, Dublin banned the sale and burning of bituminous coal.

BBC: The filthy air conundrum

Mr. Petzer "is the best coal geologist I've known, " says Mr. Slater, who is currently using him to look for bituminous coal in the Orange Free State.

WSJ: In Geology, Old-Timers Can Be Worth Their Weight in Gold

The majority of coal produced domestically is of the bituminous and subbituminous variety.

FORBES: Chinese Demand Will Drive This Wyoming Coal Stock