The Seattle post-intelligencer. [volume] (Seattle, Wash. Terr. [Wash.]) 1888-1914, 1895-10-13

placed with another assayer for an UNI
pirs assay. and this controls the settlement
for the ore After samphng the ore passes
70 a bin. later Is drawn into a car and
delivered either in the ore Storage depart
ment or 70 the roaster; II 10 the roaster
It is switched 10 the upper end Of that
building and unloaded into bins in the up
per story. 10 he drawn upon as required.
The Roasting Process.
The roasting building Is 100 feet square
and two stories nigh. and contains two
improved Browne Hara roasters, each
with a capacity for thirty tons per day.
The roasters are a series. Of brick ovens,
side by side connected by low swinging
iron doors. and extend nearly the length
Of the building. and are constructed OF
common brick. lined with fire brick. the
external appearance being something like
a battery OF boilers except that the west
end Is two stories high. The ore is fed
into the FIRST oven OF the upper series
from a hopper having an automatic feed.
Passing through the ovens are TWO end
less chains operating number OF small
cars on "A miniature railway. To these
cars is attached an arrangement reseru-
bling a gang plow. which both stirs the
ore aud moves II from oven 70 oven, final
" discharginR u into the ore storage
room. the "ravel." or mechanical stiTrer.
doing tho entire handling OF the ore in the
ovens Under the ovens are the FIRE boxes
In which wood Is used FOR fuel Tho ores
and concentrates treated In The roasters
lose from 80 to 80 per cent. Of their weight
bv the process largely by the driving off
Of the contained arsenic. sulphur and
moisture.
NJ blight on Vegetation.
Counectjur the roasters with the chin
nev is a condenser sNi4 feet and over I0o
feet long through which the fumes az
rasses from the roaSters pass and are
condensed or s0iidided. 50 thorough ia
this arrangement that there are no per
ceutible effects az arsenic on the trees or
vegetation near the works, and The brick
work 81 the coniensers and chlmneys ia
not being iu the least discoiorcd. This IS
quicklN noted hy tho visitor who has seen
the smelters AZ Denver. Pueblo ana other
points. whore large areas of brtckwoTk
are white FROM, the arsenic.
SuuerintCraent Godsell states that the
Monte Cristo concentrates contain from
- - - uer cent ~ arsenic, and that
MANY ~ the concentrates received from
other localities arc Fcav{iv charged with
81 No tuetallurEicai difficulties arc eu-
coUutcreG iu treating THESE arsenical ores.
ami fbn sm*iter saves the tuli s. Ter cent
Of ire ASSAY values 81 such ores The
raaStrrr are extracting about twelve toms
- arsenic par 5av worth in New York
Sao This 81 az present uot saved. though
ira England ores containing n smaller per
rentazc ~ arsenic are trestca for the
arsenic s1Dnc Later it is probable az
engagements VIII he made - save the ar
ssuir ard other hy-products that TOW s.
Is waste.
stores OF ORES From Many Mines.
Ths ore storage building - Sexfna feef.
TAG stories at ths uTrer end \ track
masses between - and the rooster ans
mo others pass through tho building %
twenty f>et trsSt3cs the ore M rec q r.
ing roasting being delivered from Those
IRA Ks - tas floor below Here are plies
~ limestone coke. Gre from re I.e Row
mine Trail creek Sijycr-Saleua ore f~crn
tee kooteuai district BRUSH Columbia.
aaS from Fort steele East Nootenai.
The latter ore comes G.cE1 the kocteEA4
river 70 the Great Northern at jennings
Mont Another Pile contains = 2 - grade
silver ore fTC0 NjehaTt Mont. othe-
piles represent ctheF miues 10 different
sections. The Monte Crfsto and ether con-
cs.tr.ates - direct 20 IRE rooster some
6 fa tcrs OF ora a~e nlw GA hand. Tae
eas- end ~ the storage building. besrE
nesf - the furnaces. - used as A chang
iss aarr. and s. equipped NTH platform
sra' es ar3 y neelharrcws
"A -a the proper hleC4trr - the ores
An3 nayes I'm che charge largely DEPENDS
the success u tAe treatment or Cve. great
care Is observed IN making up Tire
charges These are mate froUl A formula
prepase3 nv Superintendent Co4seal. WHO
Pas uneNho Giwlseif an excfp ftoDally ahla
uetA4i4rsisL 4he quantity q each Class