The Eureka sentinel. [volume] (Eureka, Nev.) 1902-current, 1920-08-28
EUREKA MINING NEWS
EUREKA-CROEsUs

limiting all work underground to ex-
ploration, as the bins at the mine are
full. and no other storage facilities
are available. The increased freight
rates allowed by the Interstate Com
merce Commission went into effect
last Thursday, and IL Is expected that
the acute shortage of cars that de-
yeloped the day the Commissions al
lowance of 25% increase In ore rates
was announced, will be as rapidly
converted into an ample supply for
Eureka's needs, now that the award
has gone into effect.
The big fissure in the limestone on
the Home Ticket claim, that runs par
allel with the side lines, and fur
nished large amounts of ore from sur
face workings, is being drifted along
on the 200 foot level Of the Catlin
shaft. At present no ore of paying
contents Is being taken out, but any
round OF shots may bring the drift
into high grade deposits. Through
out the entire district, these lean,
mineral stained assures or fractures,
are the connecting lines between the
masses of commercial ore, and were
the channels that carried the original
ore bearing solutions, which, in
places along these channels, precipi-
lated their metalliferous contents in
sufficient quantity to form the profit
able ore bodies of to-day. Not only
along these assures, but in the bed
ded limestones on either side of the
assure, is ore found; and one of the
largest bodies in the old Dunderberg
claim of the Eureka-Croesus group
laid at right angles to the main fis-
sure, with no ore surrounding II on
any side in the fissure itself. On the
400 foot level, a cross cut to the east,
below the raise near Georges chute.
has reached a fault, parallel to the
one that shows along the main drift,
and some ore and heavily iron stained
limestone is now present in the face
OF the cross cut. AS soon as 1t is ex-
tended to the solid limestone beyond,
drifting on the course of the fault
will begin.
EUREkA-PRINCE
Drifting along the $50 foot level is
progressing with a continuance of
good ore showings, and other work OF
an exploratory nature is also being
done. Plans have been made for an
extensive and systematic underground
development. and surface improve
ments soon to be made. include the
erection of a mill that will be de-
signed to treat the entire production
OF the mine.
Differing in composition from all
OF the ores now being mined in the
Eureka district, those from the Prince
are highly silieeous. carrying gold and
silver. The lead contents are small,
and. in many cases. negligible. There
are no refractory minerals present in
sufficient amounts to interfere with
successful extraction OF the gold
and silver by the cyanide process.
The expense of treating the ore on
the ground would be but a small por-
ton OF the expense now incurred for
freight and smelter charges, and a
mill will be placed on the property as
soon as thorough tests of the ore are
concluded, and the best system of re-
covering the gold and silver contents |
Is decided upon.
The future development of this |
eompany's ground will be OF great in
terest to mining men acquainted with |
the district. Only very few OF the |
Ill acres of its holdings have the |
limestone exposed. ALI of the claims |
lie in the Hamburg, or upper lime
stone of the Cambrian age. The east
and northeast portions of the group /
are covered to a slight depth by thel
.haf nd hA nf tho
the exception OF the ex-
posed limestone-with from one to
twenty feet of soil and loose rock.
The main intrusion of quartz porphy-
ry in the north end of the Eureka dis
trict, extends into the northeast cor
ner of the company's ground, but is
distant about 500 feet from the pres
ent workings. When the limestone
Is explored in that direction, under
Meath the shale, there is every reason
for believing that larger and richer
ore bodies will be found towards the
line of contact between the limestone
and porphyry, than are now known.
In the fifty years that have elapsed
since the locators started work, no
Development has been done outside |
VI the tAPOScu iuiCStohCcs ohA shSAS
only to an average depth OF so feet.
with but little drifting. When 1t is
considered that this small parcel OF
ground has yielded over $500.0O0 In
high grade ores alone. the possibili-
ties of the remaining acreage, much |
| Of 1t with apparently more favorable |
Biological conditions for the deposit
ton Of ore thant hat now worked, are
extremely promising. Then too, to
the geologist. Is the interesting fact
that the ore bodies in the limestones,
south and west of this quartz-porphy-
' " mass, so far as developed on the
Prince claims, are high in silica. gold,
and silver, with but small lead con-
Tents; while at, and near. the east |
ern end OF the same mass OF porphy-
" the limestones carry the lead-sil- |
YER ores Of the Holly and Bullwhack-
q mines with a low percentage OF
llica. The latter mines are In
ne limestones everything the Ham
burg shale, designated as the Pogo
mp the first sediments of the Siluri-