COLLI Kit.] 
NATION RIVER MINE. 
33 
Creek, which show the character of the coal to be similar to that of 
Washington and Cliff creeks, in that it contains fossil resin, or amber. 
The coal on Coal Creek is not known to be of economic importance, 
and attempts to exploit it have been abandoned. 
Nation River mine. — Tahkandit or Nation River enters the Yukon 
from the north about 52 miles below the international boundary. On 
the published maps of the Yukon this river has been called Tahkandit. 
It is more generally known at the present time as Nation River, and 
the coal mine formerly operated there is known as Nation River 
mine. It is located on the 
left bank, about 1 mile from 
the Yukon. Coal has been 
found at one locality only, 
though a formation probably 
identical with that which car- 
ries the coal extends down 
the Yukon for a distance of 
at least 10 miles, and it is 
probable that coal will be 
found at other places. 
The coal at Nation River 
occurs in gray shales inter- 
bedded with heavy conglom- 
erates. Both the coal and 
the inclosing rocks show the 
effects of intense crushing. 
In the conglomerate this is 
evinced by a cleavage devel- 
oped in the quartz and chert 
pebbles of which it is com- 
posed. The geologic rela- 
tions, as far as they are known, 
are shown on the accom- 
panying sketch map and sec- 
tion (fig. 2). The coal-bearing 
Yukon silts (Pleistocene) 
\rJr<±i\ Conglomerate and shale 
fe-'w-l (coal -bearing formation) 
j^^] Limestone (Permian) 
Fig. 2.— Geologic sketch map of the vicinity of the 
Nation River mine. 
rocks outcrop in the face of a bluff which rises about 200 feet from the 
creek bed. The strike here is approximately N. 60° E., and the dip 
is southeast, at an angle of 40°. About half a mile south of this point 
massive limestones outcrop, striking N. 70° E. , and dipping southeast 
at an angle of 60°. These limestones form a belt of broad, open folds 
that lie south of the coal-bearing rocks and cany fossils of Permian 
age. Unless there has been faulting, of which there is some evidence, 
the Permian limestones overlie the coal-bearing formation. There is 
no direct paleontologic evidence as to the age of the coal-bearing 
rocks, as no fossils were found in them. In similar sandstones, how- 
Bull. 218—03 3 
