The San Francisco call., 1903-12-12

islng mines, which have recently come into
notice.
IMPORTANT VEINS.
The most important veins and ore shoots
occur in assures cutting black clay states and
amphibolite schsts. being in part contact veins
The ore is practically carrying from l to
per cent Of sulphurets. mostly pyrites. The
work Of mining and milling has been reduced
from SO 30 10 50 so per ton in the district The
elevation of the lode in this county varies
from 500 TO 1900 feet averaging about 100
feet. lar-e amount OF placer gold
mined in this county in the earlier days bur
the principal product for many years past has
been from quartz. On the mother lode in this
region the slate rocks through which the veins
pass often swell upon exposure 10 the air.
timbering an expensive operation. and shafts
sunk in these heavy assures are constant
source of expense. The mine managers have
in many instances prcfited by past experience
and most Of the new working shafts are now
sunk In the hard country rock at a distance
from the veins. Milling operations well
conducted that usually the tailings issuing fror
Amador County mills after passing the can
vas shines plants are practically valueiess,
having beer deprived of their values by simple
amaisamation and concentration.
Considerable information is supplied
officially By the bureaus register of
Amador County relative to the methods
of mining that is of general interest to
mining men everywhere. Each mill
treats ores in its own way, no two fol-
lowing exactly the same method. The
stamps are all heavy and drop from
five TO six inches from 90 to 100 times
per minute. Amalgamation is practiced
both inside and outside of the batteries,
and the pulp is conveyed by launders
to vanners and shaking tables for con-
| centration. The tailings from the van
ners in many instances go to slime
plants. The sulDhides are either treat
ed by chlorination. being roasted in
reverberatory furnaces, with crude oil
for fuel, or are shipped to the smelters.
No sulphides are cyanided directly.
RECENT OPERATIONS.
The American Dredge Company is
constructing dredger five miles below
Oroville on the east side of the Feather
River.
According to the Angels Record the
Melones mine will add forty stamps TO
its milling capacity soon.
The Welsh gold mine, near Copper
opolis, has resumed.
The Millspaugh Mining and Milling
Companys plant at Millspaugh, Inyo
County. is making progress.
The Karma mine, near Mojave is in
stalling a twenty-stamp mill and also a
| cyanide plant.
The Zeibright mill. in Nevada Coun-
ty, will have five additional stamps.
The report is circulated that the
Marguerite mine, near Auburn, Placer
| County, will resume operations.
The Nevada County Miner says that
work has been resumed at the Old
Home Consolidated mine, at Mount
Vernon, near Blue Tent. The Osceola
mine. in the Rough and Ready district
is being reopened.
A two-foot vein of coal is reported
to have been discovered near Vacaville.
The Teresa Quicksilver Mining Com
pany has secured a deed to 325 acres
of land in Santa Clara County, near
Edenvale, south of San Jose
Location notices. says the Mining
and Scientific Press, were filed one
week recently in Trinity County for five
lode claims and eight placer claims.
In view of the hopes entertained for
the extension of the inter industry in
California some figures contained in a
report of United States Consul Mans
field at Valparaiso relative to the out
| put Of nitrates of Chile is of interest
! The production and control is in the
hands of a syndicate, reports the of
| fetal mentioned, and this syndicate has
issued a circular from which it appears
that for the year 19O2-03 the exporta
tion quotas amounted to 1.66S, ,4S6 tons
On March 81, 1903, the stock on the
coast was given at 269.e23 tons, and
that abroad at 51s,136 tons-a total of
! 7SS, 059 tons. In course of half the year
five new works joined the association,
making in all twenty-four "oficinas.
or producing plants, operating under
the combination. The total expectation
for 10000 has been fixed at 1925, 900
tons.