42 
FAIRBANKS AND RAMPART QUADRANGLES. 
right side, 1,000 feet from the stream. As the valley of Cleary Creek 
opens into the Chatanika flats the pay streak swerves back to the 
left side and has been found there within a short distance of the creek. 
The pay streak occupies, in general, the center of the valley, being 
about equidistant, both above and below the bend, from the ridges 
on the sides. Gold was discovered at the point where the pay streak 
crosses the valley, where good surface prospects were found. The 
following table of depths to bed rock, etc., is based on data obtained 
by Mr. Covert in 1907: 
Depth to bed rock, thickness of much-, and width of valley floor along Cleary 
Greek. 
Claim No. 
Depth to bed rock. 
Thick- 
ness of 
muck. 
Width 
of val- 
ley floor. 
Feet. 
40-50 ._. 
Feet. 
Feet. 
300-500 
14-20. 
800 
40 . 
500-600 
90 _ 
800 
25-27-- 
7 
800 
10 below . - 
80 _ . 
800 
110-120- 
40 
1,000 
(100 (left limit) 
I 
> 1,000 
[90 (first tier, right limit) _ 1 
The important characteristics of the Cleary deposits are their 
thickness, the only shallow T diggings being on Chatham and Wolf 
creeks and at the very head of Cleary Creek, the relation of the pay 
streak to the present course of the creek, and the extension of the 
pay throughout the lower part of the valley. 
ELDORADO CREEK." 
Eldorado Creek is a southerly tributary of the Chatanika, its valley 
lying between that of Cleary Creek on the northeast and Dome Creek 
on the southwest. Its length is about 4J miles, and the valley floor 
is from 100 yards to half a mile in width. The bed rock of the basin 
is, so far as determined, a quartz-mica schist, and the presence of 
diorite bowlders in the gravels indicates the presence of intrusives 
in the basin. The creek falls about 150 feet to the mile, but the slope 
of the bed-rock floor has not been determined. It appears, however, 
to be somewhat irregular. 
Depths to bed rock range from f>0 to 120 feet in the lower half of 
the creek, which is the only part visited by the writer. The muck 
is 20 to 40 feet thick. The gravels are well rounded and arc made 
up largely of mica schist, with some dioritic rock and some large 
bowlders of white quartz. The alluvium appears to be generally 
frozen. 
" These notes are based on a hurried examination made by Alfred H. Brooks in 1906. 
