The Fuel Resources of Colorado. — Lakes. IS 
sources has altered the coal into several varieties. "We have bitu- 
minous, coking, semi-anthracite and true anthracite, the alteration 
being more or less great, according to distance from volcanic heat. 
The anthracite portion is limited to an area of about 500 acres ; 
the seam is six feet thick and 3ields an anthracite as hard and 
lustrous as that of Pennsylvania. Its analysis is : 
Per Cent. 
Water 1..5*) 
Volatile matter 5.93 
Fixed carbon : 88.76 
Ash 3.75 
Total 100.00 
This mine is at present the main anthracite supply of Colorado. 
An old anal3'sis of the Crested Butte coal gives : 
Percent. 
Water 1.94 
Votalite matter 38. 18 
Fixed carbon 50.80 
Ash 3.08 
Total *. 100.00 
Coke from this coal now analyzes as follows : 
Per Cent. 
Water 05 
Volatile matter 1.15 
Fixed carbon 89. 12 
Ash 9.62 
This coke is not so strongly coherent as that of Trinidad, liut in 
other respects is better. 
At Crested Butte we leave the railroad and take horses and a 
camping outfit to explore the untouched areas of Grand River field. 
The boundaries of this field, as marked out by Hills, are as fol- 
lows : It lies on the drainage of the Grand river and its tribu- 
taries in Pitkin, Garfield and Mesa counties, and a detached por- 
tion of it on White and Yampa rivers. 
The coal of the southern end, beginning from Crested Butte, is 
traceable around mount Carbon to the Baldwin mines, thence west 
to Gunnison mountain, where, on Coal creek, are large seams of 
semi-coking and coking coal, with some anthracite. From mount 
Gunnison we follow the coal outcrop across the north fork of the 
Gunnison around Grand Mesa to Hogback canon on the Grand 
river, where sixteen miles above Grand Junction seams of domes- 
tic bituminous coal six to eight feet thick, appear on the sides of 
the canon. Thence to the Utah line alons: the Little Book cliffs 
