Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1906-09-08
BOSTON CONSOLIDATED.
Stewart Ore Body Opened In 1870
Min Was Destroyed.

I'm 1913 the old stewart ore body of
oXldized gold orc--the Oxidized cap
ping OF the sulphidc deposit Of the
Boston Consolidated discovered,
says a stan correspondent OF the En-
cheering and Mining Journal. For
several yeaIs 80 stamps treated this
gold ore from the Stewart No. ! and
No. 2. but in 1894 the mill burned
down Nothing further was done until
1897 when the present company was
formed. Considerable prospecting was
Immediately undertaken. but in vain.
The company finally learned from q
miner who had worked IA the old
Stewart mine. that I'm a certain one
Of the old tunnels a considerable body
Of sulphlde ore had been found but
these workings had been abandoned
as the milling ore near the sulphide
was too base and would not amalga-
mate well. This tunnel had caved
long ago, but the company found the
rails marking the location OF the old
tunnel The cayed rock was spilled
through. following the track In all its
crooks and turns. until az lts end the
sulphide ore body was found. Since
then large body Of this sulphlde ore
has been developed. and last October
q second ore body-the upper cham
nel' ore was discovered In the over
lying limestone
Tbs sulphide ore occurs bedded
with the strata The lower. or Pea
body. ore body occurs at the contact
between the quartzlte and the over
lying limestoneS Separating this from
the upper channel ore body Is a STRAIT
am NJ limestone about 80 feet thick,
hut varying according 10 the thickness
Of the Peabody ore. Both these ore
bodies were formed by replacement In
the limestone, They run east and west
and dip TO the north al an angle vary
ing from 30 TO 90 degrees. Two APP
proXimately parallel faults. about 500
feet apart. having a northeast trend
ana a dip Of about 50 degrees 10 the
south and cast. cut on the orebody.
The combinations have not been found
as yet.
The Peabody orc body has been
opened up for about $50 feet along its
strike and Is about $40 feet wide, its
thickness ranging from 35 TO 65 feet.
The upper channel has been developed
for about 900 feet along its strike and
is so to So feet wide. Il varies from
80 10 50 feet IN thickness. The whole
vein Il a mass Of iron sulphde carry
ing some chalcopyrite and little chal-
coclte and pyrlte In a few places
punches Of more sillclOus ore occur.
The content in copper varies consider
ably IN different parts Of the mine,
being 3 to per cent and even more in
some parts but the ore IL so stopped
that the shipments average about J
per cent copper. This ore carries an
iron excess Of Is 10 rs per cent. for
which payment Is made by the smelter.
The sulphide deposits Is opened up
by three adits viz, the Armstrong No.
/. $500 feet long. the Peabody, $500
feet long and l05 feet higher: and the
Top level 100 feet higher, In which the
sulphide ore was first found. The
Armstrong No 2. which Is 900 feet be-
low the Armstrong No. 1. Is in 500
feet. Ore was struck In this tunnel,
hut nothing has yet been done on this
ore
Tho ore is mined BY a system Of
square sets " peculiar framing The
tlmbers are framed IN oregon. whence
they are received ready for use. All
the ore Is sent by chutes down 10 the
Armstrong No !. where It is hauled by
n II horsepower Westinghouse electric
locomotive IN trains Of eight cars 90
the 6oO-ton ore bins placed along the
Copper Belt railroad tracks near the
portal Of the tunnel The cars are
Is cubic feet in capacity and hold
about i5 tons Of ore. The ore bins
are being enlarged so that they will
hold 1899 tons sullivan drills. eh
inch. are used IN the slopes but larger
ones are employed In development
work A man on q "chipple" machine
can dill and break a set OF ground
q day which Is about 20 tons ~ ore.
The ore is soft and tho sets have 20 be
Jagged. Two-inch planks are used for
this and also for flooring The sets. The
limestone hanging ~ the upper chan
mel IS strong but the limestone be-
tween the two ore bodies Is rather
soft No filling Is used except where
necessary 10 steady the stope IN the
upper channel This waste hlling all
comes from development work. for
no waste occurs IN The vein.