The Salt Lake tribune. [volume] (Salt Lake City, Utah) 1890-current, 1911-07-10
||lN| MILL IS
FALL EXPLAINED
.,.ser Charming Gives De.
,.iIs of Modern Plant Now
in Operation.
(plCITY GREATER
a THAN WAS EXPECTED
4. s.Thousand-Ton Mill Can
IsudIe Three Thousand Tons
d of Ore Daily.

L-sir before the NIilillS anu IhS'diiuESy
,siy OF America;
4. Miami ore Is dumped underground
\, sOo-ton pocket. From there 1t is
"a by measuring boxes into Tl-ton
q which arc handled in balance. and
,,sn the ore lis dumped into a l000-ton
a, on the surface II then goes 70
.Aaft crusher house. where the treat
\. IL as follows:
rnah in two No. II gyratory crushers
<t,,b cubes, thence through cast steel
.rsls provided with l-lnch holes. over
n two "a by 24-inch coarse rolls.
Aiur to I-inch cubes. The product
= rolls Joins undersize from screen.
,hp whole OF the material Is elevated
III conyeyor and distributed To SIX
Len bins, each representing a unit OF
~ Automatic Sampler.
the meantime the material is
~ on the main belt conveyor, and
sutering the mill an automatic
risr Is lnterposed. which cuts out one
A al the ore. This is reduced by re-
"a crushiugs and dwellings until a
bsnd sample is obtained from 1000
~, zach 1000 ton steel bin the ore is
N an automatic feeder and sampler
-Sined TO a small belt. TO which a
ssIne machine is attached. The dis
;-, rom the belt goes into a laun-
zjth q screen bottom. where water Is
"a This is provided with about
q openings. and the dewatered over
& snes 10 a le by 24-inch high speed
~ roll where il ia crushed TO s-inch
81. The product there Joins the un-
~ from the shaking launder and is
Isd into two parts, going TO the SINH
halves OF the section.
Plow Sheet Given.
Blowing one half, the flow sheet is as
[iws:
6er two Callow screens Of a mesh Of
IA In. oversize TO a 6-foot Chile mill
. Sresent provided with 0.029-inch screen.
y two products Join and go 10 drag
*nldsr. which consists OF an endless
-.ber belt with blades upon the bot
4 The coarse material from drag
<1siher goes TO q lo-spigot Richards him
IA hydraulic clnssifier. Product from
tables. ten In all Each table makes
sdngs rliddlings and tailings. Head :
8 10 concentrate launder. all mtddlings
g certain taiings TO single 6-foot Ilar-
-1e mill. which takes care Of both sides
4 he Bection. Tailings TO waste launder.
&n from Hardlnge mill 10 two Delster
"a tables. and slime 10 one Deister
w. Overflow from drag classi1er Joins
@iFhow from end OF hydraulic classilier.
u epes to large conical dcwatering tank
|-dtrfow to six Deister slime tables.
Efb make concentrates. middlinSs and
-lhEs Concentrates 10 tank. middllngs
DC both sectlons 20 two Detster slime
Us, and taillngs Join waste tailings
- sand table and go 10 water reclaim
j plant. Overflow from large settling
@ft kpss 10 UHst elaunder. underhow to
-lfs. Middllnes and taIlings, Tsilings
Fnste laundnr; middllngs Join coarser
g table m!ddIlngs and are rc,reateo
Cove n-menttcued two sinners.
Water Is Conserved.
moral failing from mill after being
ematcally sampled goes 10 large wooG =
ro1ical tanks. underfiow 10 waste
(der. overflow to SO concentrate set
tnrks. Overflow water returns 10
lnderf'ow joins sand taillngs and
IN iailings pond, This pond is pro
81 with dam made OF tailiuGs, back
shlch the water containing slime f.
va ana pumped up 10 the mill. As
goes on sand win h edischarged In
OF The dam. making II thus longer
hlener hut teiil preserving the set
capacity behind il for the climina
ana disposition OF slime. In a. couple
yssrs mechanical means viii be pro-
lor storing the sand iaillngS In al
9s'li uuch.
20 feed into the mill has been about
y. cent copper Ratio Of Cencentra
nas been 20 !. and the cXtractior
howlV climbed from 20 10 16 pei
u IS expected that the promised
~ rent extraction Will be achieved
oDcsntrate viii run about 30 pei
copper, the mineral being ncarl!
cnaicocite with but a small amount
[Erhte present.
TX mill consists Of six sections, o
~ lnree are equipped with two s-foo
NILS each. The fourth section i.
men with three Burch hiGh-sDeeC
,ols, and they will shortly hc uset
rsn rns crushing for comparison Will
me- mills, The Burch roll is pro
.on nn'in tleeIlng movement by whici
oh ls slowly moved laierallv In IRON
-. Other In the direction OF the axis
'"s 'oil so as 90 prevent growing,
. Capacity Is Greater.
mlll was originally designed 81
we siN scctions would have capa
-uPp Tons "A day. but IT seems evi
~ wa, this capacity VIII reach 800
gay All OF tho machinery u
svray driven by either induction
lors. '''s '''-'o't -o-rEe'' A' =
w tne amount of power We viii use
n ssucns look 31S ky. | estimate
so treating 2000 Ions day, run
"a tvur sections. we will probably tax
rss, rss, equailing 400 h. p. That vii
ory'nlny; Get pump the water and crus
5t probaDlN arrangements Will %
M " ~ that We Will do crushing 10
s,ss, zen hours. and then pumpiu
mi mi 3I len hours. The mill itsei
~ psssshahly take 700 XIV This WI
"a ds,V NV Tor grinding OF orc one
H. ana pumping the water th
lik. ds 10 keep a steady load Q
Ia e., have always figured fror
ID ems, s'e as the figure horse po@e
III IIauo Of concentration is sbou
tsue varies from IS 70 81. 1t ma
NJ, ~ eight or ten wears. but her
|Rtt DE, ne much difference It Is
10 lmpiete change In our case froT
y Iu,nMI,uo M,o chaleocite, Mr.. A!dridGe !
"a a 'aan we do. There Us nowher
essa much pyrlte AS at Cananea.
"a nr.,!ne me alteration OF the pyrite ha
tesa thorough. The only thin
<sss tho no look out for Is that al cer!ai
|tzts '"Y caalcocite has changed Int
4.0e0 suppose we have 1000. 900 {
No. snr IONS OF ore that will run 30 pc
d S%pper that is silicate Of copper
"e mixed silicatr and chalcocitc.
steel and Concrete Bins.
1&iEad 1&iEsahdurlcal ore bins are the cheapc.
tq SI,oi storing the ore. They al
, eorn es with concrete bases. All {
tb.eehtrator Is steel and concret
Cha po"er house and pump hous
tes sn burn except the. doors ar,
Il Hhnes. in the mill the on
ossrd min layer OF boards on n
roofin. which is Johns Manville asbe:
We a. The mill is painted smoh
NJ sray an dthe roof Is the san
l.esnn mht y makes quite a pleasir
porc,. ana II will be cool In summe
mouse is also painted so
A. with the landscape.