21. Production of steam coal for railroad use by the Mountain Park Coal Co . Ltd . began in 1912 or 1914. 22. The Mond gas became popularized during the steam coal , resulting in cheaper electricity at about 1 / 20th of the normal price. 23. The principal coal seam was the Coleford High Delf, a steam coal much in demand and said to be up to thick. 24. It discharged 29, 334 tonnes of steam coal which was imported from China and meant for use by the local cement industry. 25. The mining line of business for Mechel comprises production and sale of coking and steam coal and iron ore. 26. He then established the Powell Duffryn Steam Coal Co ( PDSC ) which grew to be the largest coal company in South Wales. 27. In 1867 the company acquired the Aberaman Estate from iron master Crawshay Bailey, the land of which held much good quality'steam coal '. 28. These features limit the boiler's ability to burn hard bituminous coal and they require a supply of Welsh steam coal , or similar, instead. 29. He was a key director in the Powell Duffryn Steam Coal Co, the Rhymney Iron Company and the Taff Merthyr Steam Coal Company. 30. He was a key director in the Powell Duffryn Steam Coal Co, the Rhymney Iron Company and the Taff Merthyr Steam Coal Company.
