viously drifted, was hydraulicked south almost to the south-west corner of Lot 11418.
South of that point, old shallow placer-diggings extend up-stream for about 3,500 feet,
about 1,800 feet up-stream from the junction of the west branch.

Deeply buried pay-gravel at the mouth of Chisholm Creek probably was mined
from the Vulean shaft on Lightning Creek. Considerably farther upstream from
there, gravel beneath several hundred feet of boulder-clay was reached from the Snow-
den shaft, said to be 203 feet deep, but the gravel was not profitable to mine. Extensive
mining of less deeply buried gravel was continued up Oregon Gulch, from near its
junction with Chisholm Creek. The workings extend up the west branch to the south-
west corner of Lot 10429 and up the north branch 600 feet north of the south boundary
of Lot 10429. Most of the work was done by Chinese miners.

Old placer-workings, some in shallow gravel, and some drift-workings extend up
Perkins Creek above the crossing of the Lightning Creek road. A fairly extensive
hydraulic pit was worked by Felker and Sparkes on a bedrock bench lying east of the
ereek on the western half of Lot 10743c. The limit of the placer-workings on the creek
is at the head of the Estman hydraulic pit at the southern boundary of Lot 10735c.

A hydraulic pit in recent years has been advanced up-stream on Grub Gulch for
about 900 feet above its junction with Lightning Creek. A few old shallow workings
and test-holes extend for a few hundred feet beyond the present limits of the pit.

Gold-bearing gravel on bedrock at shallow depth was worked at the mouth of and
up-stream on Van Winkle Creek as far as the intake of the lower Grub Gulch ditch.
Some hydraulicking was done just up-stream from the intake of the lower Grub Gulch
ditch, and old placer-workings extend beyond almost to the intake of the upper Grub
Gulch ditch, about 4,000 feet south of Lightning Creek.

Deeply buried bedrock gravel was worked at the junction of Amador and Lightning
Creeks, but no workings, other than prospect shafts, extend up-stream on Amador
Creek beyond the falls near its mouth.

Bedrock gravel on Houseman Creek, buried beneath a considerable thickness of
glacial material, was drifted up-stream to.a point about 1,200 feet from the junction
with Lightning Creek. Later, a hydraulic pit has been advanced north-eastward up
Houseman Creek for 1,700 feet up-stream from its mouth.
Slough Creek is flowing on top of an accumulation of vailey-fill which is known to
have a maximum depth of about 287 feet. An unsuccessful attempt at mining the
bedrock gravel opposite the mouth of Nelson Creek was abandoned because of inability
to drain the gravel or to reduce the high water-pressure. There has been no other
mining of bedrock gravel in the bottom of Slough Creek.

Gold-bearing gravel lying on. bedrock benches extending along the south side of
Slough Creek between Burns Creek and Nelson Creek has been worked extensively.
The benches, from which the gold-bearing gravel has been mined, slope upwards £0
heights of 100 feet and more above the present level of Slough Creek. Hydraulic
operations have exposed wide areas of bedrock which were formerly covered by gold-
bearing gravel overlain by several tens of feet of boulder-clay and glacial materials.

Placer-ground at comparatively shallow depth has been mined extensively in the
lower 2.000 feet of Nelson Creek, and old shallow workings extend up-stream for
several thousand feet.

Shallow gravel on bedrock was mined on Coulter Creek down-stream from the foot
of the canyon about half a mile above its mouth. Above the canyon, bedrock gravel
of anold channel buried beneath boulder-clay up to 150 feet thick has been hydraulicked.

Devils Lake Creek has been mined at various places from the old shaft sunk at its
mouth up-stream to its head at the divide into Chisholm Creek. Two small hydraulic
operations continue, one high on the west side just north of Hong’s siphon and the
other on shallow bedrock near the divide into Chisholm Creek.

Bedrock gravel at the mouth of Burns Creek was drifted in the lower part and
hydraulicked farther up-stream. Shallow placer-workings extend up the creek almost
to the southern boundary of Lot 10440c.

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