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THE CHANNELS: THEIR DIRECTION. 11] 
900 to 1,000 feet in a direction about N. 20° to 25° W. (magnetic) following, up stream, along 
the right bank of the channel, whose deepest portion lies, or appears to lie, east of the tunnel. At 
the northern extremity of the mine the channel seems to make rather a sharp bend to the west 
and southwest, and the tunnel, which is driven some 300 feet beyond the end of the straight por- 
tion, forms within this distance a curve from N. 25° or 30° W. to 8. 75° W. (magnetic). 
At Yankee Jim’s the broad channel has been worked through the hill called “Cleveland Hill,” 
just north of the village, for a distance of some 2,000 feet, in a direction nearly S. 75° W. mag- 
netic ; the width is varying, but it will average probably a thousand feet. The area which has 
been worked off here is estimated at fifty acres. 
In the Gore Tunnel and Rough and Ready Claim, at Forest Hill, a channel runs in a direction 
of N. 87° W. (magnetic) and is narrow. It is perhaps the same as one of the outer channels in 
the New Jersey Mine. 
At Jones’s Hill, four miles northwest of Georgetown, the channel in all probability came in from 
the northeast, passed through the crest and then curved around to the west. The general course 
of the channel in Castle Hill, above Georgetown, is about N. 20° W. (magnetic). 
About a quarter of a mile east of Bottle Hill a deep channel, on which is the Roanoke Tunnel, 
has been followed entirely through the ridge in a direction about N. 50° W. (magnetic), the course 
of the ridge being itself nearly east and west. This channel is said to have a heavy fall towards 
the northwest, so that a brake was needed on the mine-cars. The main channel runs from the 
mouth of the Nevada Tunnel, on the southeasterly side of the ridge, in a pretty straight general 
course, with but little curving, through the Nevada, Washington, Roanoke, Eureka, and Black 
Hawk Claims, a distance of about 7,000 feet ; it then makes a sharp bend and goes some 600 or 
700 feet in a direction 8, 55° W., crossing Roanoke Gulch into the next spur, then bending again, 
and running about 700 feet in a northwesterly direction, then turning again to the southwest, and 
running for about a thousand feet to a point where it passes out of the last spur. From this it 
appears to have passed along over the southern portion of the present river caiion, and to have been 
carried away, nothing more being seen of it until it strikes Jones’s Hill, at a point bearing 
S. 79° W., and distant about two miles. 
There seems to be a deep channel crossing the Missouri Cajion, at the Shoo Fly Claim, about a 
quarter of a mile 8. 50° E. from the Buckeye-Sucker Claim. This channel runs in a northwest- 
southeast direction, the bed-rock on each side of it being high. 
The Blue Lead near Placerville is supposed to enter the hill on the southwest side of White 
Rock Canon, and to pass diagonally through Negro Hill Ridge and beneath Oak Grove and Dirty 
Flat, thence to Smith’s Flat, and through the ridge between that and Webber Creek, coming out 
at Try Again Tunnel. This would give it a very nearly north and south course. 
At Dickerhoff’s Mine in Cedar Ravine, near Placerville, a tunnel has been run into the hill for 
a distance of over 1,000 feet, and in a direction S. 10°—12° W. (magnetic), the pay-gravel being 
from three to four feet thick. The channel followed is narrow, in front, being only from 200 to 
300 feet wide, but it enlarges as the hill is penetrated, and at the back end of the mine is from 
500 to 600 feet in width. It bent around to the southeast and southwest, being quite crooked, 
and in one place enclosing an island of high bed-rock. The rim-rock here rises on each side to the 
height of from forty to sixty feet. 
At a point in the surface of the bed-rock, on Clay Hill, near Placerville, there are furrows worn 
by the current, their longer axes lying in a direction of about S. 52° W. (magnetic). 
At the west end of Indian Hill, near Placerville, the strike of the bed-rock is about N. 35° W., 
and the direction of the furrows worn in its surface by the water ranges from 8. 60° W. to S, 85° 
W., the average being probably not far from 8. 70° W. (all magnetic). 
In the hill between Smith’s Flat and Dirty Flat, near Placerville, called Granite Hill, the gen- 
eral course of the deep channel, going “ up-stream,” is supposed to be about N. 40° W. (magnetic), 
which course it seems to hold nearly through the hill, and then to make another sharp bend to the 
north, running nearly north magnetic, across the head of Dirty Flat. It would appear from the 
