The Wallace miner. [volume] (Wallace, Idaho) 1907-current, 1913-10-02
ECONOMIC GEOLOGY Of REG|ON AROUND
MULAM, |DAH0--G0vERMMENT REPORT
INTERESTING REPORT OPERATIONS OF MORNING MINE AND
MILL EIGHT YEARs-HUkTER, STAR, ALICE
OTHER WELL KNOWN PROPERTIES

oped. The portions Of these veins that
are being worked are chiefly In the
ridge between Mill creek and Grouse
gulch. In 1904 both productive veins
were reached by tunnel No. 8, be-
tween whose portal on Mill creek and
the mill, which had its present loca-
ton, ore and supplies were hauled by
a narrow gauge surface railway The
present adit, tunnel No. 6. which runs
nearly north under the crest OF the
ridge, was completed in 1906 ana
Transportation Is now effected by pow
erful electric motors, which bring the
ore directly to the bins. The equip
ment both on the surface and under
ground is impressively substantial.
The mill is perhaps the most inter-
esting in the Occur d'Alenes, but only
It's salient features can be touched on
here. 1t comprises two virtually sep
arate plants. In one. the galena If
concentrated by gravitational meth
ods in the other sphalerite. which,
being Of nearly the same specific grav-
lily as siderte, is not amenable t.
such methods, Is concentrated by 49,
tation. The processes employed tc
save the galena are highly elaborated
and involve repeated grinding, much Of
the material being finely ground ir
Hardinge conical pebble mills. The
| lot nr0
one employed to save the sphalerite.
The mill losses Of both lead and zinc
are still considerable. They are prob
ably carried off for the most part ir
the large amount of slime which re-
suits from the repeated grinding. Al
the time of visit experiments were be
ing made on other flotation processes
which are likely to be installed In the
near future and to result In much
higher saying than that hitherto oh
tanned.
The workings above tunnel No.
are now inaccessible and the level o,
that tunnel is the datum from which
the depth of later workings Is reckon
ed. Seven levels have been driven o.
the Morning vein at intervals of 200
feet below tunnel No 5. Tunnel NO.
Is on the S0O-foot level, and the lowest
depth attained is $50 feet lower, where
a station was being cut out at the time
of the recent visit. The lowest Slopes
are on the 1450-foot level, which i
about $500 feet below the highes
slopes and nearly 5000 feet below thu
highest point Of the outcrop. On TIN
You Like vein there are drifts at 200
foot intervals down to the tunnel level
below which the vein has not been fol
lowed.
Geologic Conditions.
The Morning and You Like veins ar
both nearly vertical and strike abou
west northwest. The rock In .whicl
they occur is quartzite that varie
considerably in hardness, purity an
thickness of bedding but which APP
parently all belongs to the Revet
uuartzite. Some Of the purest an
thlckeSt Oeuueu qudTtAile 10 oNP'"o
in the west You Like drift on the 500
foot level (No. s tunneD and on tn
walls of the great station on this leve
near the Morning lode. Even thi
! auartzite is for the most part some
what sericitic however, and most @
that adjacent to the lode Is distinct
so. On the whole the most serlcltl
and flaggy rock is that in the easter
part of the mine. which probably ne
longs to the uppermost part OF the Ike
yett auartzite No lgneous rock WI