New-York tribune., 1879-11-17

with these lines of separation and near the poh' o
contact between the Lower Silurian and magnetism
limestone. The plane of contact between theso
three formations pitches TO the north. or INTO tue
mountain. at an angle of abOut 3o0.
In driving "A tunnel into Emma Hil work, OF
course. begins in the Lower Silurian hmeS'cne'
which is called by the miners OF Alta the loo' coul.
try rock When tho magnetism limestone Is i'Ho"er'
T. IL not only found that il is of an entirely di-
ferept character and appearance from that pelo"'
but that the wall between the two is perfect one
which when not broken is as well defined as that
of \ ROOM Passing through the middle formation
4 distance which if measured perpendiculariy
would be about 250 feet, another wall Is reached
equally well defined and beyond IL the character oi
the rock again changes The character of theform-
alton may best be seen in the Illinois tunnal, now
owned by the Emma Company. The lower line OF
separation and the wall at that point are plainly
shown at the place where the Joab Lawrence Com
pany has begun drift to the north toward the Val
lejo workings. and the upper wall IN u
similar drift cut by the Illinois Tunnel Com-
pany years ago. The managers OF mues AT Al'a'
among them Mr. Charles Read, the superintendent
of the Joab Lawrence Mines. whom found TO DE
most careful and instructive guide. hold that the
magnetism limestone is a true vein, bounded by the
walls have described and hlled with cnutes anu
chmneys of slver-ead ore which generdliv exte.d
the other and down in the direction OF the up OF
the vein To unknown depths. ,
That the ore is there and that it occurs in the
manner described, there Is no doubt. Great cham-
bcrs like those the old Emma, IRON winch SO many
millions worth of were taken. have O""n scarce,
but smaller chutcs have been discover cd whenever
they lave been intclligcntly searched for. AT the
same time the character of the so-callei VEN mat
ter Onagneslan hmeStoncl Is not such ms
IL would be expected To be If the whole belt was
an enormous hssure or contact vein ana am CON
vinced that the ore-hoaTlng rock Is SIMPLY
dep sit or stratum formed beneath the surface OF
water ard at erwaTd thrown up INTO IT'S present pO-
stiOn When the uphe val took place. OF course
there was necessarily disturbance. and the enor-
moU, weight of The deposits and the position into
winch they were thrown probably caused Siding
at the pOint, of least stance. winch were on TIE
planes of separation, and thus made the faces o the
walls smooth. they are now found. The presence
of magnesa. winch Is precipitate OF lead. accounts
lOr the presence OF the ore.
VISITS TO IHT MINES.
The fr.t of the mines winch visited was the old
Flapstah ascending the steep mountain side on
car drawn mp the incline " means Of stationary en-
gincs. This incline is covered by low shed 10 pro-
tect il from the SHOWS and is so long and steep
that the hosting apparatus Is not powerful
enough TO haul loaded car and the long,
heavy wire rope by which 1t is drawn
Fan OF the way from the bottom to the top.
One engine is therefore placed IN the middle of the
incline and az that point a rope from another en-
gine at the top is attached to the 10 take it the
remainder of the way. Having reached the top
| and properly equipped ourselves walked into
the main tunnel of the Flagstaff Mine, several
hundred feet 70 the top of the shaft and the hoist
mg works Thence descending through some aban-
doned workings over broken ladders and through
low and narrow passages, We reached the 1O0-foot
level. From that we climbed down the main shaft
200 feet more and then walked of through
a long drift beyond the northern end line Of the
8. ,tsaI
by the lessee of tine Flagstaff in developing a small
body Of ore. II looked Ike chute which
may produce considerable quantity of
good ore and the fact that a similar body has been
found 200 feet below leads 70 the belief that it is
quite extensive saw ore in the Flagstaff itself.
Passing for long distances through the different
levels j was shown nothing but ground that has
been worked out and there seemed to be- no dispOsi-
ton TO make new explorations The Flagstaff work.
Jugs and machinery seemed to be used for the de-
velopmeut OF an adjoining mine and that was rs yet
producing very little ore.
Following the belt toward the southwest, the
next mine which visited was the Vallejo. owned
by the Jaob Lawrence Company and now produc-
ugnore ore than all the other mincs in Little Cot
tonwood. This mine was purchased not long ago
for $50 600. and within short time after posses
sion was obtained ore worth $4,000 taken
from a single chute The Vallejo has in times
past turned ont very large quantity Of ore,
as is ttestcd by the enormous chambers that were
cxoavatcd. When Mr. Read became tine supeIin-
teudent of it there was little in sight. BY
systematic exploration. making the mine pay all
expenses he has found several large bodies of ore,
and have no doubt will discover others. | spent
several hours underground in this mine, and
found it one of the most interesting Of its
class that 1 have ever visited. From what
| saw there. ! convinced that Emma
Hill from the bottom to the top of the magne-
sian limestone belt Is honeycombed with ore bodies;
that comparatively few Of them have vet been dis
covered: that the enormous chambers found in the
Little Emma were exceptional, and not likely to be
duplicated. and that while many OF the chues and
chnneys are small they will yield far profit
in working. but VIII never he boDanzas. see
reason why the same system of mining adopted by
the Joab Lawrence company should not make adj
Joining mines, 30 far they have not been worked
out, productive.
went over the Emma Mine the surface.
tered The Illinois Tunnel. and saw the edge of one
Of the great chambers of that body of ore which
gave the mine it, chief value. and made Its sale in
London for 81. 100000 sterling possible. / visited
the old main working tunnel. and went TO the
mouth Of the Bay City Tunnel. to which Mr.. TrenOr
W. Park. who once more owns the property. is
now removing the machinery. and through which
he intends to work the mine. did not 20 INTO the
Imma because 1t looked very wet, and was told,
besides. that the superintendent was directed not
10 admit visitors understand that a little ore Is
being shipped from this mine, and, indeed, saw
some OF il al of the smeliers at Sandy. The ore
of Emma HI lead and silver In most places 1t
is disntcgTated aud earthly in its character, but is
easily reduced in n smelling furnace.
West of Emma Hill the formation changes from
limestone To quarzite, and there, | am told.
are mines thar are IN true tssure veins, and which
are very promising in their character East of the
Emma Hill belt there are also some mines which
did not have time ~ visit. but which was told were
good - prospects, Little Cottonwood has, believe,
seen its bes' DAYS. NJ possible discoveries, should
think. could again induce Eastern foreign cap