IMPROVE- MENTS IN SEPARATING GOLD FROM THE ORE
Year: 1852

page_text: LETTERS PATENT to Stanislaus Hoga, of Nassau Street, in the
County of Middlesex, Gentleman, for the Invention of "IMPROVE-
MENTS IN SEPARATING GOLD FROM THE ORE."
Sealed the 30th March 1853, and dated the 22nd October 1852.
PROVISIONAL SPECIFICATION left by the said Stanislaus Hoga
at the Office of the Commissioners of Patents, with his Petition,
on the 22nd October 1852.
I, STANISLAUS HOGA, of Nassau Street, in the County of Middlesex,
Gentleman, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN SEPARATING GOLD FROM THE ORE" to be as follows:-
I commence, first, with an improvement in effecting the separation
of gold from the ore by amalgamation. It is well known that where
the gold is mixed with the ore in a state of very fine division great
difficulty is experienced in effecting the amalgamation. Now in order
to effect this object well and expeditiously I moisten the ore by a
solution of muriate of ammonia, and then the amalgamation is speedily
performed. I transfer the earthy mass together with the amalgam to
an iron cylinder, with a perforated plate at bottom resting on a wooden

page_text: plug of about an inch in length, filling the bottom of the cylinder, with
the grain of the wood parallel with the length of the cylinder. By
means of a piston I apply pressure to the mass in the cylinder, when
the mercury, carrying with it the gold, will percolate the mass and issue
in finely divided streams through the pores of the wooden plug, leaving
of course the earth and other matters in the cylinder. To separate the
gold from the ore by washing I take a tube of equal diameter through-
out and bend it, but not too abruptly; when bent, the tube will partake
of a U shape, with one arm longer than the other. The long arm is in
proportion to the small one of 10 to 1. The ore is placed in the short
arm and water poured down the long arm; the pressure of the water is
sufficient to force out the earthy matters from the mouth of the short
arm of the tube, while the particles of gold, being of greater specific
gravity than the earthy matters, will remain in the bend of the tube.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Stanislaus Hoga in the Great Seal Patent Office
on the 18th April 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I,
STANISLAUS HOGA, of Nassau Street, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of October, in
the year of our Lord One thousand eight hundred and fifty-two, in
the sixteenth year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Stanislaus Hoga, Her
special licence that I, the said Stanislaus Hoga, my executors, admi-
nistrators, and assigns, or such others as I, the said Stanislaus Hoga,
my executors, administrators, and assigns. should at any time agree
with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Inven-

page_text: tion-for "IMPROVEMENTS. IN SEPARATING" GOLD FROM THE ORE," upon the
condition (amongst others) that I, the said Stanislaus Hoga, by an
instrument in writing 'under my.hand and seal, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office within six calendar months next..and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Stanislaus Hoga, do hereby
declare the nature of my said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say: ...
My Invention consists, first, in effecting the separation of gold from
the ore by amalgamation with fluid mercury, and pressure; and, second,
in an improved instrument for effecting the separation by washing.
AMALGAMATION AND PRESSING PROCESS.
. I first moisten the ore with a solution of muriate of ammonia, and
add fluid mercury according to the richness of the ore. Amalgamation
will take place more perfectly and expéditiously than if the ore had not
been so moistened. I then transfer the earthy mass, together with the
amalgam, to an iron cylinder, having at bottom a perforated plate
resting on a wooden plug of about one inch in length, which forms the
bottom of the cylinder. The grain of the wood of the plug must be
parallel to the length of the cylinder. I next apply pressure to the
auriferous mass in the cylinder by means of a piston or ram, when the
amalgam will be forced in finely divided streams through the pores of
the wooden plug, leaving the earthy and other extraneous matters
inside the cylinder. The amalgam is then treated by the usual process
in order to separate the gold from the mercury.
WASHING PROCESS. .
Some gold ores will be separated more readily by washing than by
amalgamation. I place such ores in an instrument which I construct of
thout which I hand that mabiban nhwanélio

page_text: branch in the proportion of from four to ten to one. I make the end
of the longer arm slightly bell-mouthed. I place a lip of a curved or
vaulted form over part of the mouth of the shorter arm, so that when
the columu of water flows upwards out of that arm it may strike against
the lip, and be thereby made to deviate from its straight course and
assume an angular direction. In the centre of the short arın I place
an iron rod which rests on the bottom of the arm and is furnished
with fans or blades, and has a cross piece or handle at top, by means
of which the rod and its blades may be made to rotate rapidly and
stir the auriferous mass while undergoing the washing process. I
place the ore or auriferous earth in the shorter arm of the bent tube,
and then pour water down the longer arm, when the water will drive
and wash the carthy matters out of the shorter arm of the tube, leaving
the particles of gold (they being of greater specific gravity than the
earthy matters) in the tube.
And having now described the nature of my said Invention, and in
what manner the same is to be performed, I declare that I claim as
constituting my said Invention,-
First, the separating of gold from the ore after amalgamation by
pressure applied thereto in a cylinder or other vessel provided with a
wooden or other suitable porous bottom.
And, second, the U shaped tube herein-before described, wherein to
effect the separation of gold from the ore by washing.
In witness whercof, I, the said Stanislaus Hoga, have hereunto
set my hand and seal, this Thirteenth day of April, One
thousand eight hundred and fifty-three.