Los Angeles herald., 1909-12-05
BUY TUGBOAT FOR
THE SIERRA PINTO
MINE AND MILL
WILL SAIL THURSDAY WITH
SUPPLIES
Los Angeles Syndicate Prepares to
Mine and Mill Rich Gold Ores
of Large Property in
Sonora, Mexico

A seagoing tugboat was purchased
yesterday at San Pedro by Capt c.
Henry Thompson, J. ID. Thompson of
Pasaneda, l.. u. Porter and c. II.
White of Coorado Springs, comprising
a syndicate which has taken over the
Sierra Pinto group Of gold mines six
teen miles from Georges bay, in the
northwest part of Sonora, Mexico,
which will play an important part in
the development Of a wonderfully rich
deposit of the precious metal. The boat
is to be loaded at once with a hoist
and other mine machinery and sup
plies, and will then sail Thursday for
st. Georges bay.
The Sierra Pinto mines include the
Dolores, the Bonanza and Planchon
properties. a 25-ton mill and a mile of
frontage on a landlocked harbor at
St Georges, together with a railroad
connecting the mine with the mill. The
entire outfit, mill and railroad will
eventually be transferred to a cOrpor-
alton, the gentlemen mentioned having
financed the property. Mr.. Porter
will take personal charge and will
start the mill up on ore already de-
veloped.
The capacity Of the mill will be in
creased later by the addition of tube
mills, concentrating tables and the
cyanide process, which will double the
capacity Of the plant. Sixty-five per
cent of the values will be saved by
amalgamation on the plates.
The ores of the Sierra Pintos are
free milling and of high value. After
carefully samplng the mine, Mr.. Por-
ter states that there are in reserve
more than 5000 tons of ore which will
average $4215 per ton, and the mines
will afford a monthly output for the
mill of from $25, 900 to $50, 900. In the
Dolores, which is the principal one of
the group of mines, the main shaft has
been carried to depth of 450 feet,
with levels to the 400 and about 5000
feet of laterals, principally in ore. The
vein in this mine will average two
feet, and the ore is Of an exceptionally
high grade. In the Planchbn, which
has been opened to a depth OF $50 feet,
the ore win run better than 500 per
ton, breaking eighteen inches. In the
Bonanza the vein, which is from three
to four feet thick, has been faulted, but
Captain Thompson says that 1t can
easily be recovered by driving a cross
cut short distance.
The company will mill all its ores,
shipping the bullion from Guaymas di-
rect to the mint at San Francisco, with
the exception of the ores of one mine,
which are an unusual occurrence.
These ores are galena, carrying some
zinc and high percentage in gold.
The gold content is astonishing, the
lowest sample showing $1S7 per ton
and running up as high as $4S1 in the
yellow metal. The ore extracted from
this mine as development is carried on
will be shipped by the tug to Guaymas
and from there to San Francisco bay
smelling plants.
Aside from the mine and mill the
company will conduct a general store
at ST. Georges bay, where they have
a stone building 35 by 2SO feet in di-
mensions, and will also carry a stock
of merchandise at the mines, the rev
enue from this source being no incon-
siderable item. 1t is probable that a
small town will grow up on the bay
near the railroad and mill.s The com
pany will work a force Of 125 to 150
men at the mines, and mill and on the
railroad, and is now considering a re-
quest for the extension Of the railroad a
distance of forty miles to some large
copper mines. If this extension Is de- |
cided upon, it is probable that sep