Rogue River courier. (Grants Pass, Or.) 1886-1927, 1909-12-31
SECURING THE PULP AFTER
LEAVING BATTERY
MUCH sULPHIDE is LOST
a deeply Interesting Subject to All
Persons Interested in Quartz
Mining.

Editor of the Courier: | have been
reading an article In the Observer of
december !, written by T. ]. Brlnols-
erhoff, ON the recovery OF free gold
oy the electric current. | agree with
TINS writer regarding the great loas
OF free gold from quartz owing TO ia
rusty or corroded condition. but n
Is quite question II the dlfficultv
can De overcome by or through the
electric current, for in many cases II
takes very strong acid TO remove
TINS coating so as to permit the mer-
curry to adhere to the gold.
For comparison you may taka n
piece or lead and hammer Il until
you have hole through Il and Won
wili nave the same duh coating over
IT, but on securing II shows the
bright metal. This compares to our
coated gold once II is frightened and
then comes In contact with mercury
IL Is readily caught. The question
Is now much OF our gold is 40 lieht
ana line that Il goes over the plate
WIN the pulp and never gets to the
mercury on the plates? What at
traction VIII the electric current have
On the gold to settle this through the
pulp and bring II to the mercury?
u seems to me that an acid strong
TO remove these various coat
ngs would attract the mercury.
thereby losing much of It's energy. as
most OF the acids net more readily
nan on many oxide coatings. my pro-
'ess is to scour the pulp after IL
caves the battery sufficiently to
brighten the gold, then give the
Vhole product a mercury bath. thus
ne light, as well as the heavy, re-
eives the same treatment so that
ach particle comes In direct con-
act with the mercury.
ihis is accomplished by an arras-
ra IKE arrangement, the material
eng fed In the center, passes be-
ween TWO grinding or securing sur
aces and Is then carried down 10
ne mercury and passes out around
ne outer edge OF grinding dIsc
hd between this disc and the ton
the arrastra there is from two 10
1roe inches OF mercury, thus the
lateral has 10 rise up through
'om 10 to 20 pounds of mercury.
ne space between the disc and tub
about one'half Inch. This device
III handle the material from any
'dinary stamp mill and VIII saye
ore gold than any other system OF
nalgamation have ever seen and
requires less attention. After II
lsses through II should 20 TO the
table TO save the base
Ilues.
While we have great deal OF
&c gold there Is but little, n any OF
II ore that does not carry more or
IS high grade Hlphldes and # Ia
mistake to think II not worth saw
s and we have the same trouble I'm
wing the concentrates Did Won
or pan below the concentrating
Die and not get some sulphide? n
] would like to know the class OF
Die used for ! have never seen Il
saved and do not know that n
u be- But that which can be saved
the pan should and can be sayed
the table properly constructed
q having the right movement. and
believe material can be saved ON
g table that cannot be saved in the
n
IL would seem 10 me that any con.
ntratlng device having from 400
400 motions per minute Ia Imprac-
able TO make complete separa-
m NJ the lighter material IL held
snpension by so great a vibration
d passes OF with the pulp. My
Derlence proves 20 me the necessi-
oof giving the heavier material the
satest travelling motion possible
IN the slightest agitation and the
DE TO be 10 constructed as 10 give
the highest capacity possible and
fH.,st....t - -,