96 FAIRBANKS AND RAMPART QUADRANGLES. 
A number of igneous dikes which cross the lower part of Quail 
Creek show considerable mineralization by metallic sulphides. xVn 
assay of a porphyry gave no gold, but 0.52 ounce of silver per ton. 
The creek was located in 1898, and it is said that it was desired to 
call the stream " Ptarmigan " Creek, but as no one in the party could 
spell ptarmigan it was named " Quail," the spelling of which was 
easier. Some gold is said to have been taken out in that year, and a 
little was taken out during the summer of 1904. The total is thought 
to be about $3,300. 
There seems to be a considerable accumulation of gravels at some 
places, while at others the bed rock rises to the surface. The. gravels 
are of the country rock, with many bowlders of porphyritic granitic 
rocks. 
A number of miners were fixing up old cabins and building new 
ones, and getting ready to prospect the creek during the winter. 
GUNNISON CREEK. 
Gunnison Creek is located a few miles farther down Troublesome 
Creek on the same side as Quail Creek. Miners are said to have 
worked upon it during the summer of 1904, and to have taken out 
some gold, but no further particulars were learned. The creek was 
not visited by the Geological Survey party. 
GENERAL SUMMARY. 
The alluvial deposits formed from the rocks of the valleys in which 
the deposits occur are found both in stream channels and on benches, 
and are probably all of stream origin. They are of Recent and 
Pleistocene age, and their thickness is generally near 5 feet, but varies 
from 5 to 100 feet. 
The gold is generally found in the lower 2 or 3 feet of the gravel 
and upper 1 or 2 feet of the bed rock, but on Shirley Bar and Omega 
Creek it is in places distributed through the whole depth of the 
gravel, 5 to 7 feet, and on Omega Creek the gold is found not only in 
the gravel but through several feet of intimately mixed ice and clay. 
The placers are of two general types as regards their origin, placers 
of ordinary concentration from the disintegration and wearing down 
of the bed rock, and placers formed through reconcentration of the 
gold in older gold-bearing gravels by the cutting of streams. The 
bench gravels of the region and the placers of Ruby and Slate 
creeks belong to the first class. To the second class belong the placers 
of the creeks cutting the high bench of Minook Creek and the placers 
of Doric, Glenn, and Seattle creeks and Gold Run. The other 
a Burlingame, E. E., & Co.,. Denver, Colo. 
