The annexed engraving is a vertical section of a machine for pulverizing and washing gold quartz; also for aralgamating and separating the gold. An American patent was granted to the inventor, P. G. Gardiner, of this city, on the 9th of June last, and a patent his also been issued in England. The nature of the invention consists in having suspended pulverizing and amalgamating basins, also their peculiar arrangement, both being attached to the same shaft with a screw interposed between them, and operating together with an oscillating motion. A A is the frame of the machine, in the lower part of which is the driving shaft, B, which is vertical and receives motion from a steam engine or other motive power by a belt driving pulley, C. The upper end ot the shaft is forked to receive a metallic block, D, which is attached and jointed to it by the pi vot,/, passing transversely through the axis of the shaft; E is the lower or amalgamating basin; it is of cast-iron, of a circular form, and has a hub inside which receives the shaft, F, to which it is firmly secured; G is the crushing or pulverizing basin. It is lormed with a channel, M, around its bottom to receive two balls (one, K, being shown) ; this basin has a hub, c, which fits on the shaft and rests on the hub, a. The part, H, of the basin rests upon a number of bearing pieces, b b, which stand up from the bottom of the basin. The raised circular part, H, has an opening around the shaft, F, which is covered with a wire gauze screen, L. The upper end of shaft F, has an eye, c, hung on a hook, rf, of a strong vertical rod, screwed into the top of frame, A, which suspends the two 1 basins with their contents. The lower end JofshattjF, is connected by a crank to the shaft, B. This crank consists of an arm, I, which is fitted to work freely in a slot or hole made in block, D, at right angles to the pivot,/; J is a metallic box which is bored to receive a journal,!, on the lower end of shaft, F. A spring, g, is applied between the block, D, and a shoulder near the end of the arm, I; another spring, A, is applied between said block and a shoulder at the opposite end of the rod ; the tension of these springs is exerted in pushing from the block. OPERATION.—The gold quartz to be operated on is first broken into pieces about the size of a man's hand or to egg size, and is fed in suitable quantities to basin, G, and is there subjected to the crushing and grinding action of the balls in the basin. A stream of water is allowed to flow into the basin, G: all the finely pulverized quartz is carried down through screen, L, passing into the amalgamating basin, E, which contains the mercury. In this basin a constant agitation is kept up by the peculiar motion impaited to it, which brings all the gold in the pulverized quartz into contact with the mercury. The .light particles of the crushed quartz is washed away over the lip of the lower part of basin E, by the constant overflow of the water at that part. The amalgam is withdrawn through a suitable valve in the bottom of the basin. The pulverizing and amalgamating basins have a peculiar oscillating motion owing to the combination of the crank arm, I, connecting the axis of said basins, as represented, with the driving shaft. The lower aide of the basins is continually changing, they aving a swinging roiary motion. The balls travel round the channel of the basin and roll along with an easy motion owing to a continual shifting inclined plane being produced in said basin by the action of the crank, and the relation ot the axis of the basins to that of the centre line of the suspension rod on which the basins are hung. The springs, g and ft, admit of the crank arm, I, being lengthened and shortened in a measure, so as to balance the relative stroke of oscillation with the weight of balls employed ; they also sei ve to prevent shocks and jarring in stopping and starting the machine. We have been informed that the operations of this machine have been so satisfactory that a joint stock company has already been formed in this city with a capital of $1,000,000 to carry out the objects of the patent in constructing and working machines, selling rights, and granting licenses. A very large machine has been in operation for some time at the Phcenix Foundry, Vestry St., this city, where it can now be seen at certain periods grinding the quartz. The claim of the patent is for " the arrangement of the vibrating pulverizing basin, and amalgamating basin attached thereto, with the screen intei posed between them, said basins being attached to the same shaft." The working machine at the Phranix Foundry has a longer shaft than the one shown in the above engraving; the amalgamating basin on it is also placed farther from the pulverizing one, and is not so large as the one represented above. More information about the sale of rights machines or sale of the stock, &c, may be obtained by calling on Mr. Gardiner, Trinity Buildings, this city, or by letter addressed to him.
This article was originally published with the title "Quartz Pulverizer, Washer, and Amalgamator" in Scientific American 8, 48, 380 (August 1853)