Page 759 - calmining1890

TRINITY COUNTY. 707

et; in Park's Bar Claim, thirty feet; class of gravel, river wash;
>me sand and clay, occasionally cement on bedrock from eighteen to
venty inches thick. Formation of bedrock, slate and soft porphyry. The
eavy storms of the past winter filled the elevator pit with wash from
le back lands; therefore, during my visit, the elevator was not run-
ing, the owners, however, stating that as soon as the waters receded
fey would open up the pit and resume operations.

THE MAMMOTH CLAIM

onsists of one hundred and nine and seventy-three hundredths acres,
)cated on the opposite of Trinity; operated by Messrs. Lorenze and
ieibbrant; hydraulic. This deposit is river wash on high benches,
here being two as far as exploited. Water from Connor Creek flows
tito reservoir; one monitor, nozzle, six inches; pressure of water, eighty
bet; one thousand five hundred feet of pipe, and one mile of ditch;
eason, five months; amount of water used, six hundred inches, all
trough giant; no overflow sluice stream. From claim there are
wenty sluice boxes through a twelve-foot undercurrent; waters falling
gain into four boxes, carrying into four hundred feet of bedrock tail
ace, thence into flume of ten boxes, the second undercurrent finally
lumping on flat, the lower bench (worked out) one hundred and
wenty feet above the present river bed. Average ground worked in a
eason, two acres; average bank, one hundred feet deep; stated yield,
\2\ cents per square foot.

JACOBS BROS.' PLACERS (DRIFT).

Sec. 35, T. 33 N., R. 11 W., comprises two hundred and seven acres.
►Vater limited; twenty inches from Connor Creek. Drifting the ground
ind sluicing; ground rich on bedrock, being in the same channel as
*ed Hill.
The following mines are located in T. 33 N., R. 11 W.; working season
imited, having to depend mainly on the short ravines in the adjacent
nountains:

atterson Bar Placer— Section 35 39.73 acres.
ponrad Donnenbrink— Section 12 ... 39.94 acres.
led Flat Placer— Sections 12 and 13 55.32 acres.
lowell Placer— Section 13 18.89 acres.
lowers & Birger — Sections 12 and 13 53.10 acres.
There are several others that could not be visited.

EVANS' BAR ( HYDRAULIC).

Sec. 33, T. 33 N., R. 10 W., comprises sixty-five acres; Junction City
District; located, 1887; bench gravel deposits; average depth, forty feet;
bne Giant, No. 3; nozzle, four-inch; five hundred inches of water;
pressure, one hundred and sixty feet; one hundred and eighty feet of
sluices; grade, eight inches; two undercurrents; water from Skunk
reek, heading in Oregon Mountains; ditches, three, from one quarter
to three quarters of a mile in length; season, five months; average run,
three hours daily; gold, $17 62 per ounce; average yield per season,
$4,000.