The Eureka sentinel. [volume] (Eureka, Nev.) 1902-current, 1920-05-22
EUREKA. NEVADA. MAY %, 1920
EUREKA ORES At DEPTH

Mnen asked Tor ms ideas of the
ore deptns of Eureka, MAJOR Henry
u. Catnn said:
rne facts gained by experience in
the mining OF eureka ores TO the
present depths demonstrate tnat Tor
ten niies or more along the lode
tnere Is succession OF ore occur
rences more or less connected; that
Wherever ore appears it has gone
down, never wholly disappearing but
IN larger or smaller way II picks up
again ana in wider streak, or minute
seam, SHOWS unInistaKaDie proof OF
the passage or the depositing solu-
lions. In other words, the solutions
responsible Tor the ore deposition
came from below instead OF percolat-
ing downward; that the amount OF
deposited metallic values already
Iound mas been very large and has
come from a great length and from
closely confined width; that to the
greatest depth Of exploration, and be-
low water level, ore continues to be
Iouno; that the ore deposits are OF
later formation than the contracting
ihnes.
"Confirmatory of these salient facts
in their relation to the probability OF
ore at depth, Is the testimony onered
ny the ores themselves, something OF
whicn may be mentioned in passing
Inc lead ores universally contain less
gold tnan the silicious ores. The
siiicious ores conform more closely to
the vein type, have greater regularity
la their width, and convey the i'm
preston tnat they come from some
where and are going somewhere. The
lead ores, even, SHOW lines of vertical
| rather than horizontal, deposition.
The replacement ores in themselves
evidence depth, etc., etc.
If the location of the ores was in
a circular, oval. or irregular area, we
might assume that the solutions
forming them come from some one
point of egress. But along a regu-
lar line OF ten miles, or SO in length,
the solutions were directed upwards,
and the probability of a great under
iying assure as their source forces it.
self upon US.
Because l am more familiar with
The local situation there, and because
1t offers particularly convincing evil
dence thereto, l give as illustrative
Of the strong probability of ore at
depth, cross section in the Dunder-
berg. roughly 500 feet or whereabouts.
Here We have the Home Ticket
vein dipping to the east and slightly
north, its regularity of dip estab-
lished for several hundred feet in
depth, and the Dunderberg vein along
the shale and inside of the rhyolite
dixie with an established dip to the
west and north.
The ores of the Home Ticket vein
are very silicious and. both on this
cross section as we'll as north and
south, are mainly of gold and silver
value. The ores of the DunderDerg
contain more lead. Cross assures in
the lime from either of them show
ores of like character, with the veins
and with generally converging dips.
The ores of the cross assures as well
as of the veins go down. A winze
from the 400-foot level, 800 feet in
depth and about 800 feet below the
ores under the ridge is the deepest
working, and here dampness and the
presence of more sulphides indicates.
approach to water, the permanent
hundred feet below. The, ores at
depth show increasing values in the
better seams, particularly in gold,
the last car, from which returns from
the smelter have come. running 2.67
ounces gold per ton. No ore is found
outside of the v shaped lines of this
cross section between the converging
dips of the Home Ticket and Dun
derberg veins under the rhyolite
dixie.
Here, evidently. the Home Ticket
is a main vein, as shown by its char
acter of placement and by the COM
position of its ores, and the Dunder-
berg vein an offshoot, finding the
crushed lime favorable path Of up
shoot and kindly for the deposition of
its lead.
THAT here, the Home Ticket vein
will not go down is against all ex-
perience, the world over.
II am firmly of the belief that the
Eureka ores go down and have no OBJ
lection to your stating this belief"