Los Angeles herald., 1910-09-25

ng SIS per ton in the mill, has been
worked to a limited extent. 1t is at
present being prospected ana gives very
encouraging Indications.
Descending the slope Of the noun
tain to about $500 elevation, the YET
low Metal or old Jefferson mine, at the
south of Bowman lake, is now beng
eouinned with a working plant. The
galena ores are rich and the veins are
strong.
EUREKA MINING DISTRICT
Within the granite area, at the west
erly edge of which is located the town
of Graniteville, a strong noftn an ana
south coursing system of veins out
crops. and has been developed from
the Last Chance mine south OF May
bert, northerly for six miles or more
and through a range in elevation from
about 5000 feet at the Yuba and Ger
man mines on the South Yuba river
bed to about 5000 feet at the Baltic
mine. From the riverbed to the noun
tain top these veins are developed py
economical tunnel mining. The Eagle
Bird. Yuba, Mountain View, Star, Bal
tic. Ethel, Iowa and Wisconsin have
been producing mines of this system.
About one mile to two miles west OF
this system at the contact of the gran
ite with the strong belt of slate, eours-
ing north and south, Is the CASTOR
ridge or old California vein system at
east dip, with the hanging wall veins
Just easterly in the granite. The Gas
ton mine os the most extensively ue-
veloped mine of northwestern Nevada
county and has been a good dividend
payer for many years. The present
development is being made through a
lower crosscut tunnel 1890 feet in
length. which will develop the I'M
mense contact vein at several hundred
feet below the lowest present workings
The slate belt to the footwall slde,
or west OF the Castor mine, contains
the Culbertson- acknowledgements sys-
tenn. the Erie and Ancho, the Spanish
and Spanish Ridge and numerous other
vein system of north-south course, ana
60 to 10 degrees east dip. The Spanish
mine was operated by Fred w. Bradley,
and during his working of the mine
huge open surface cut, or quarry was
carried with the vein, and the vein mat
ter. consisting Of quartz str1ngers ana
slate, was mined and milled at a pront
on a recovery of so to go cents to the
ton. The operating costs of about 40
cents a ton are the lowest known rec
ord of costs in the mining world,
WASHINGTON MINING DISTRICT
Near the town of Washington, along
the contact of slate with serpentine, the
Giant King. Red Ledge, Nickel Ledge,
St. Patrick and other vein systems
have been successfully prospected and
are now being equipped for extensive
development.
Northwesterly from washington, at
the southerly end of the famous am
phibolite formation in which are To-
Gated the veins Of the Allegheny dis
trict in Sierra county has been re-
Gently discovered and developed the
Fairview mine. This mine contains
strong veins of good average grade ore
with shoots containing high grade ore
with specimen deposits.
Bordering the'Washington and Fair
view belt of black states and amphi-
bolite on the west is a belt of the yell
low, barren states known as the Cape
Horn formation. This belt courses en-
tirely across Nevada cunty and marks
the division between our mountain
mining district to the east and our
foothill district to the west.
BANNER HILL-DELHI VEIN SYSTEMS
Adjoining the Cape Horn slate belt
on the west is an extensive and irreg-
ular shaped mass of black slate, max
ing from a thin southerly point south
of Banner hill, coursing northerly and
constantly expanding in width through
Illl anu COnllllulllS eiSA OSo SAAS
northern boundary of the county. The
Delhi mine at the northern boundary
contains remarkable bodies of ore and
deposits of specimens in these states
associated with small masses of in
truded porphyrite. At the extreme
southern end of this same slate belt
the Central Consolidated mine, south
of Banner mountain, shows strikingly
similar vein characteristics and has
developed good sized deposits Of good
average ore with frequent local en-
richments due to the influence of the
igneous porphyrites. The Banner
mines are also encased in these states
and have a strong vein system.
NEVADA CITY MINING DISTRICT
The Central Consolidated mine is
located near the "V'' point of the di-
verging zones of slate which form the
eastern and the southwesterly boun-
daries of the Nevada City mining dis
trict The core of the Nevada City
district is a plug of grandiorite, with
in the body of which granite and along
it's contact fringe with the states is
formed the somewhat complete sys-