Sierra County advocate., 1896-01-31
TBr BONANZA MILL

supply OF pyriiie concentrates from
the mills must not be over
looked. Even with a smelter here
treating ore at rates which will en-.
courage mining operations. there
must always be u considerable
proportion OF the output available
only through some process Of mill.
iuR or concentration. Since the
aummer of 1890, when it was bnilt,
the BONANZA mill has been con
s.an.ly in operation and has tren
successful and paying institution.
The mill is at presen, under leas"
to Mr.. j. E. Collard, who as mill
man for tie Bonpnzl Company has
gained valuable and wide exper'
ience in the pecHl,arlties OF the
different ores OF this camp. In a
recent inspection OF the works
everything WAS found in perfect
order with conspicuous neathe's
and cleanliness Of the premises.
Air. Collard has place Tor every
thing and is extremely methodicnl
and careful in his work. In treat.
ing custom ores he gives close per
sonaI attention to the work mud he
has been eminently successful Ia
saving a high percentage Of value
A few instances in proof may be
given from information we have
gained from customers Of the mlll:
The tailings from the last run OF
Caledonia ore essnyed only A lOOIhs
Of an ounce gold. On Bonanza
and El ORC heavy sulphide ores
the tailings were 8 mud . l00tbs,
that il NJ so at utmost per ton AZ
the value os these ores average
over $40 per ton /, is evident that
over 90 per cent saving was effect
ed. Eighty per cent is generally
considered to be excellent and
satisfactory work, and bad all the
mills OF tins district doLe that well
there would be d firfent story to
tell Of profits and losses. Mr Col.
lard evaporates the water OF the
failing samples SO there can be no
error in results, or each lot nt
ore run vt the mill he takes sam
pies of pulp, concentrates and tall'
inge, and these samples ere envei
oped aud preserved for future re
ference aud proof il deaired In
,etor,ing and refining, specially
constructed furnace aud plumbago
crueibles ars used, and bis success
In ihis branch is evidenced III the
very clean retorts which have been
aent from here 10 the mint ou u
59b ounce retott from n small lot OF
Richmond lease ore the deduction
for druss at the mint VAS only hall
an ounce, Successful mill work
lies in attention to all the details
and not in any occult process. Nh.
Collard uses no Gu, micels nor be.
lieves in any beyond the use OF
concentrated lye to destroy grease, /,
or lime to Offset the effect OF man.
ganese oxide.
The mill is equipped with a A.
h. .. boiler, b b, y. engine, 0 loot
Huntington, plates Aft 4in. by Stt'
din, three Gilpin County Concen'
tratois, Blake crusher aud automa-
tic orc bin and feeder, arrastra
cleaning pan aud many other ap.
pliances aud cJnyeuiences ihe
treatment capacity varies with lie
tiueness oi screens considered nee.
cessary according to the character
Of the ore, but is within the ex-
tremes Of twelve aud eighteen tons
per day. On heavy ores hue screens
are used, while on ore such as the
Snaka aud Blblail mines very
close work can he done with 40
mesh screen. Taking the average.
II would I've about right to figure
ono ton OF concentrates from each
eight tons of ore, SO the mill may
be counted upon when tully occn
pied to furnish two tons OF pyntie
concentrates per day to the smelt
log works.
Besi les the Bonanza there are
the Standard, Homestake. Charter
OAK 4Ad Sle{,taek a,llsrcGGl.~ss|
able OF furnishing about the sawe