The Fuel Resources of Colorado. — Lctkes. 11 
bustion, and an unknown amount presumably left. The develop- 
ment is sometimes impeded by the faults which cut off the contin- 
uity of a seam. 
The following is an analysis of Marshall coal : 
Per Cent. 
Water 10.73 
Volatile 44.11 
Fixed carbon 38.38 
Ash (5.11 
The area of the Colorado portion of the northern field is esti- 
mated by Hills at 6,800 square miles, the accessible portion at 405 
square miles, and the available coal at 2,568,000,000 tons. 
From Franceville, for about thirty miles south, there are no de- 
velopments until we reach Canon City, on the south bank of the 
Arkansas river where is a small isolated field, twelve miles long 
by two miles broad, carrying a seam four to five feet wide of non- 
coking bituminous coal, which has long been a favorite fuel from 
its high calorific power and general purity. The gentle dip of the 
strata admits extensive development. There are three or more 
companies developing this small field at present. 
THE SOUTHWESTERN FIELD. 
From the Arkansas river to the Huerfano river, a distan^ce of 
fifty miles, another barren space, and then we meet the northern 
extremity of the great Raton plateau and Raton coal fields. Some 
of this coal has been burnt, or changed into natural, but worthless 
coke by volcanic dykes with which the region abounds. As a 
whole, however, it represents an enormous amount of bituminous, 
domestic and coking coal. The cause of this change from a lig- 
nitic to a bituminous and coking character may be found in the 
great volcanic manifestations of this area. 
The following analysis of Al Moro coal gives : 
Per Cent. 
Water 0. 54 
Volatile matter 30.29 
Fixed carbon ... .54.43 
Ash 14.74 
Total 100.00 
Hills estimates the available area of this field in Colorado at 
473 square miles, and the available coal at 4,490,200,000 tons. 
In former years there were but two companies working in this 
great field, now there are a dozen. 
From the fields of the eastern slope we turn to those on the 
