EINDLE AND 
HESS. 
RAMPART PLACER REGION. 113 
valley. The gravels vary from 4 to 20 feet in thickness, and the gold 
s mostly on the bed rock. The upper portion of this valley, like 
liose of the other creeks, has never been productive. Preparations 
aave been made to work the gravels by hydraulic methods at a point 
ibout 2 miles above the mouth. Ditches and flumes having a combined 
ength of 4,300 feet and a capacity of 500 inches give a head of nearly 
30 feet. An elevator had been placed in position and the plant was 
ibout ready for active work. 
Florida Creek. — Florida Creek has produced some gold, but at 
present little work is being done. 
Interstream or u bar" gravels. — The areas lying between the streams 
vhich have been described, for a distance of 2 to 3 miles east of Minook 
Jreek and at an altitude of 500 to 700 feet above the creeks, have a 
strikingly bench-like surface and are mantled with a deposit of gravels, 
vhich is said to be in places at least 100 feet thick. These areas are 
ocally termed "bars,'' and distinctive names have been given to them, 
iuch as "Idaho bar" and "McDonald bar." The canyons of the 
treams are sharply cut below them, and they appear as portions of a 
>nce continuous surface that was related apparently to the drainage 
ystem of Minook Creek. The gravels include quartzite, quartzite 
>reccia, some vein quartz, a small proportion of chert, and much 
Lne material, consisting of decomposed fragments of softer rocks. 
?he gravels are coarse, and bowlders 2 to 3 or more feet in diameter 
re common. Gold has been found in them at widely separated 
calities, and much work has been clone in investigating them, 
specially on " Idaho bar," directly north of Little Minook Creek. 
The facts that they are gold bearing; that the main streams cease to 
e productive above the zone of these gravels; that the minor tribu- 
nes, like Little Minook, Jr.-, which drains onty gravel-covered areas, 
>ntain gold; and that most of the creek gold, wherever found, is 
iuch worn, all seem to point to them as the source of perhaps the 
reater portion of the gold found in the stream gravels, without, how- 
ver, excluding the possibility of its derivation in part from the bed 
3ck through which the canyons have been cut. There is no reason 
) believe that gold is evenly distributed in small quantities through- 
ut the bench gravels, or that it is anywhere concentrated in them to 
ich a degree as in the gravels of the present valleys. These valleys 
ive a trough-like character, where conditions have been favorable for 
mcentration within narrow limits. The gravels of the benches have 
3en reworked by the present streams, and conditions have been favor- 
Die to a high concentration of the gold contained in them. This 
cality probably illustrates the process of reconcentration, the impor- 
,nce of which is strongly emphasized by Brooks in the Nome reports 
Brooks, A. H., Reconnaissance in the Cape Nomi'iutd Norton Bay Regions, Alaska, in L900, p 149, 
Bull. 259—05- 8 
