Deseret evening news. [volume] (Great Salt Lake City [Utah]) 1867-1920, 1904-05-10
THE BAMBERGER.DELAMAR
How the Great Nevada Gold Producer Is
Operated.


A communication from the pen of w,
A. Scott, travelling representative of the
Engineering 4 Mining Journal, treats
interestingly and instructively Of the
Hamburger Lamar mines, at DE
Lamar. Nevada, Of which Simon Bam-
berger Of this city is general manager.
"Thc company holds the original DE
Lamar group, the April Fool and a
large area Of contiguous territory, the
principal workings being on the De La
mar. A 3Wft. hssure Is filled with a
partially leached gouge material In
which shoots occur, but the enriched
quartzite country on both sides of the
flssure Is the main source of ore. The
naturalization ls not readily detected
by the eye and constant assaying Is re-
qulred Cutting through the country
rock and dlagonally intersecting the
fssure are two porphyry bikes, about
300 feet apart, the ore bodies being es-
pecially strong at the contacts OF this
porphyry with the quartzlte. The mine
is opened by a series Of adits which
follow, or are adjacent to, the great
hssure. From the top level to the
lowest the vertical distance Is 500 feet
the ground between is well developed
The ore Is dropped through chutes to the
lowest adit, which penetrates 1900 feet
and Is equipped for electric haulage.
The ore i'm the quart2ite IL gold bearing.
with unmportant silver values, and Is
called telluride. on what appears 10
be q parallel assure, some 200 feet east
of the main assure, bodies OF ore nave
been developed, in which the gold is
partially free.
"The mill Is treating an average OF
300 tons per "A hours, one third of which
comes from the free-gold ore-shoots.
The ore passes first to two No Gates
crushers, and is re-crushed by two No.
4 Gates TO about 1-inCh size, The
crushed ore Is then elevated to storage
bins and passes from the latter by au-
tomato feeders to " Chilean mills, six
of the Trent and six of the fanny pat
tern: all are provided with slotted
screens. equivalent to 40-mesh ore
from the free-gold veins Is crushed and
milled separately and the pulp Is passed
over amalgamating plates. The tellu-
ride ores, of which 200 tons per day are
handled, pass direct from the Chilean
mills to cyanide watts throughs Linny
hydraulic separators, which part the
sands and shines. A weak cyanide So
luton Is used In the Chilean mills, and
as the pulp passes to the vatsit Is stand
ardized In the sand-vats the pulp Is
leached II hours in a strong solution,
the latter then being drawn off to the
gold tanks, passing thence through
hitter presses, and then to the zinc
boxes. The strong solution In the sand
watts Is followed by a weak solution and
then wash-water. The sands, with 10
per cent moisture, are finally dropped
to a belt conyeyor, running under each
row of watts, and delivered to main
conveyor which takes them 10 the
dump. The barren solution below the
zinc boxes Is used as weak solution
| In the sand-yats.
'"rhe slime from the Linny separat-
| ors is conveyed by a launder to sys-
| tenn of tanks, where It is leachedi the
gold solution Is decanted and passed 10
! the filter presses and zlnc-boXes IN the
usual way. The slime In the main
| tanks is leached SO hours. The WASH
water IS pumped TO the Chilean mills
| for use therein The pulp that flows
from the matchmaking plates Is eva
! nIded separately, bu. by the same gen.
| eral method. The consumption OF a
cyanide I'm the entire mill amounts TO
two pounds per ton of ore treated. The
ore values average $3.50 per ton. Inc
tailings from the mill assay about iOe
per ton. superintendent FRANK T.
Syindler considers that the metallur'
gical problem is solved. and that the
principal point now Is large tonnage
and economical handling -,
The machinery at the mine and NH
is electrically driven, there being Is mo-
tors, aggregating over 900 h. p Th'
power house Is In Meadow valley wash
IL miles away, where two dynamos
driven by two cross-compound con
Messing engines, generate current at q,
ZOO volts. The steam-boiler capacity Il
1850 h. D., the boilers being of the Hein'
make. fired by mechanical stokers' "A
the power-house is the main pumping
rlant which forces water from a wei
in the wash through a pipeline l
miles long, to the min ana me toWn o
be Lamar The difference in elevation
is 100 feet, but there are two puml
statious ON the line"