Yampa coal field, in Routt and Moffat Counties, northwestern Colorado. The Twentymile Park district includes only the southeastern part of this great field, but that is now its most important part, as i.t contains all the commercial mines that have been developed in the field. It is also generally regarded as containing the more valuable coals of the field, except the anthracite, which is found along the eastern margin of the field farther north, Where, on account of the ruggedness of the surface, access to transportation lines is difficult. The mines in the Twentymile district have been developed since the Denver and Salt Lake (Moffat) Railroad was extended into this district, in 19o6. The coal has become widely and favorably known as an excellent fuel for both manufacturing and domestic use, but the development of mines has been greatly hampered by inadequacy of transportation facilities and by the fact that all the coal reaching the market had to be hauled up steep grades over one of the highest passes in the Rocky Mountains. The report gives full information regarding the chemical composition of the coal and its heating value as determined by the Bureau of Mines. This value is compared with the heating values of competing or possibly competing coals, so that the consumer, if he cares to do so, may balance one coal against another and thus be able to select that which will give the greatest return for his money.
H.L.