152 ALASKAN MINERAL RESOURCES IN 1906. 
ELKHORN CREEK. 
Elkhorn Creek has also been a small producer during the last year. I 
The operations have been carried on for a distance of about 2 milesj 
along the stream, but the largest amount of work has been done 
near the mouth. The section exposed in pits at the junction of thej 
Niukluk and Elkhorn Creek is as follows : 
Section at junction of Niukluk River and Elkhorn Creel. 
Feet.j 
Vegetation 2 
Clay and muck 4] 
Sands and gravels 41 
The lowest member showed considerable cross bedding in the 
sands associated with the gravels, thus indicating the variable char-j 
acter of the water by which they were deposited. Numerous pieces 
of wood in a more or less decomposed condition were found in the] 
gravels. The surface form and internal structure suggest that thej 
deposit is an alluvial fan of Elkhorn Creek rather than the flood plain 
of Niukluk River. Work on this creek was abandoned before the last] 
week of September and, owing to the absence of miners, no estimate 
of the production or tenor of the gravels could be obtained. 
CASADEPAGA RIVER. 
MOUTH TO BONANZA CREEK. 
The general impression of the mining which had been done along 
the Casadepaga in 1906 was that the work had been carried on more 
by prospectors than by active settled companies. As a result of this 
method of work the production from the stream and its tributaries 
will probably be small. On the lower course of the river as far as 
Bonanza Creek no mining had been in progress. Near Bonanza 
Creek two camps had been established to work the low bench gravels 
of the Casadepaga. These camps, however, have employed onlj 
two to five men each, so that not much work has been accomplished. 
A little work had been done on Bonanza Creek, but it was not visited. 
BONANZA CREEK TO PENELOPE CREEK. 
From Bonanza Creek to Penelope Creek the river gravels have beei 
extensively prospected during the summer by a drill with a crew of 
six men, with the aim of determining the character of the ground. 
No statement as to the results of this work can yet be made. One 
peculiar feature noted in drilling below the mouth of Penelope Creek 
was that on certain of the river bars gold occurs on the surface and not 
on bed rock. There is no false bed rock of clay at these places and 
the surface concentration is due to the washing away of the gravels 
