282 CONTRIBUTIONS TO ECONOMIC GEOLOGY, 1902. [bull. 213. 
p.! 
Yukon, about 90 miles below Nulato. The coal is in sandstones, from 
which fossils of Eocene age have been collected. 
One bed 39 inches in thickness, in two nearly equal benches, sepa- 
rated by a clay parting about 1 inch thick, has been opened. The 
bed, which has a dip of 45°, is very regular and shows no variation, 
either in strike or thickness, in a distance of 400 feet. The coal is | 
bituminous, having a fuel ratio between 1.20 and 1.50 and water con 
tent between 6 and 7 per cent. The ash in the lower bench is 3.53 per ] 
cent and in the upper bench 8.63 per cent. The coal does not coke. 
This mine produced some coal as early as 1900, and early in 1902 it 
passed into the hands of the present owners. The equipment consists 
of a drift 400 feet long, starting from the river bank above high water. 
The greater part of the coal above this drift has been mined. The 
coal cars bring the fuel to the mouth of the mine, where it is piled on 
the river beach and loaded on steamers by means of wheelbarrows. 
One thousand seven hundred tons 'of coal, which sold at the mine for 
from $10 to $15 per ton, have been produced. 
Coal mine No. 1. — This mine is on the right bank of the Yukon, 25 
miles below the Williams mine. The coal is contained in sandstones, 
which may be either Upper Cretaceous or Eocene in age. One coal bed, 
having a thickness of from 2^ to 3 feet, has been mined. A sample 
of the coal taken from the cropping shows on analysis that the coal is 
bituminous, with a fuel ratio of 1.61 and a water content 4.82 per cent. 
The Alaska Commercial Company attempted in the winter of 1898 to 
open a mine here, and 900 tons of coal were taken out, but the mine 
was abandoned the same year on account of the difficult}' encountered 
in keeping out the water. 
Hall Rapids. — Near Hall Rapids, about 30 miles above Anvik, a 
small bed of coal'has been found in a formation consisting of white 
and yellowish tuft's of undetermined age. This coal has a lignitic 
appearance, but on analysis shows a fuel ratio of 1.35 and a water 
content of 8.23 per cent. The coal bed is probabl} 7 of no value on 
account of its limited extent. Similar coals or lignites are of frequent 
occurrence in these tuffs. 
On the Upper Koyuhuk River. — A coal bed containing 9 feet of com- 
paratively pure coal occurs near Tramway Bar. a This coal is either 
Upper Cretaceous or Eocene, but the exact age is undetermined. The 
analysis shows that it is a bituminous coal, having a fuel ratio of 1.40 
and a percentage of moisture of 4.47 per cent. 
Anvik River. — On the Anvik River, about 50 miles up, coal is 
reported by Mr. J. W. Chapman, missionary at Anvik. The point is 
about 10 miles back from the Yukon and probably is in a general way 
opposite the Williams mines. The coal is exposed in the river bank 
and is used by the natives in making black paint. 
aScnrader, F. C, Reconnaissance on Chandlar and Koyukuk rivers: Twenty-first Ann. Rept. 
U. S. Geol. Survey, Part II, p. 485. 
