Ellsworth American. [volume] (Ellsworth, Me.) 1855-current, 1879-05-01
No. 4.

On my second visit to the Bluehill Copper
Mining and Smelling Company's works I
found their mill in operation, aud viii endesvcr
TO give Q description that shall convey some
idea of the process to which the ore IL ssb-
jecied although Il cannot be fully understood
until seen. The mill 10 . three story building.
the ground door covering ass square feet,
there being In oil 6.sss feet Of hoors. A I
have already stated the power for the works 10
furnished BY low pressure engine Of % H. r.
having two boilers Of joint capacity Of 80 X.
p, and 90 arranged as to be used either to-
gether or separately. The ore 10 taken on
email cars, aud by means OF IN elevated rail-
track il delivered in the second story Of the
mill, where Il 10 handed over to the tender
mercles Of Blake crusher" which 10 Of suf-
Acient size and power TO take . piece Of ore
sxl5 inches between its iron jaws aud reduce
1t to fragments. The motion OF the vibra, ing
face Of this machine Is only SIS OF An inch; from
the crusher the ore 10 passed to the hrst set Of
rolls, these are OF cas-, iron weighing about
1900 lbs. each, and one Of them has . thick
backing Of rubber to Its bearings, allowing II to
yield when larger pieces Of ore than common
are passing. Amer passing these rolls the ore
is "sixed' and passed to the second set Of rolls
then TO . screen having l6 meshes TO the inch.
sized" agsiu, aud the course paced again 10
second set Of rolls. Then IL taken BY IN slevs-
tor from the Is screen to the third story. 10
screen having 30 meshes to the inch. wha,
passes through this screen IL taken by an ele.
vstor to another screen having 60 meshes 10
the inch. what passes over the % screen goes
to the first concentrating table. What passes
through the % screen IL taken to . screen hav-
ing 100 meshes to the inch. While that passing
over the &c screen goes TO the second "concen-
trs,ing table" What passes through the 100
screen goes 10 "slimerr In the basement.
where IL Is treated by a We; process, while
what passes over the 100 screen goes to con-
sntratins table No. 3. These tables have
their tops slightly inclined, SO that by means
Of vibratory motion the ore is separ stcj into
three grades. First, the concentrated ore
which in the form OF powder (more or less
hne A. IT comes from dineren, screen.) 10
packed in strong barrels containing absu, so
pounds for shipment. Second the "middling."
which contain some copper and 10 again passed
through, aud Third, the waste which {, thrown
Away.
This company now employ. about Is men
and have some 1000 tons OF ore awaiting re-
dueiion. The mill 10 now reducing from Is TO
Is ton. per day. but more concentrating tables
are to be added and the capacity Of the mill
will be 30 tons per day Of 10 hours. The mill
will soon be run the whole "a hours. The
Company are now sinking q shaft near the
mill. at the place mentioned by me in = former
article. the shan Is 1Iit feet. They are using
three drills by day and two by night No
trouble /. experienced from water except from
the surface.
This mine and the "Douglsss' are within
one-hslf mile OF each other, and either Of them
alone, would well repay the trouble Of = visit.
No one can have any idea OF the amour, Of
ore to be found here until they see IL. Ny
thanks are especially due TO h. o. Cutter, Esq.
the President Of this Company for a pas. ad-
hitting me to the works al all times. And
also for explanation of the process, illustrated
by hne plans OF the mill In his Office. C.E.