Mohave County miner., 1916-08-19
INVENTION REDUCES
 ORE TREATMENT ID
 ONE DOLLAR 4 TON
IFrOn Tuesdays Daily MinsrI

AAGo@-S 0aly AAAAa4l
 A newly invented and thoroughly tested machine for treating free mill ing gold and silver ores. known as the Zimmer centrifugal separator, is to be introduced in this camp within the next few weeks.
 Its success is said to be so amazing that with full plant, to cost less than S5000, ores can be treated for less than $1 ton. It is especially adapted to 0atman ores. This is so because of the ores here being strictly free. The excessive cost of power here makes it's possibilities alluring.
 The main and essential feature of the plant is it's separator. It is a small affair, being composed of sort of bowl-like receptacle. In the bot tom of this is placed quantity of quicksilver and with a half-horse- power motor the bowl is whirled at rate of 190 revolutions a minute. In the sides of the bowl are a set of grooves and the centrifugal motion causes the quick to rise into these grooves. It stays there on the same principal as the ivory ball inside of the rim of a roulette wheel. Each groove is filled with quick and it pro jects inside the edge of each an eighth of an inch. In this the pulp of the rock is introduced and in the whirling motion it comes in contact with the quick and is instantly amalgamated. ha raacE eN k,, I,rr I,, ineness of the gold particles or colors. In Oatman it must come down to about 100 mesh. Other camps run from 40 to SO mesh.
 The form in which the crushing is done as long as the fineness of the mesh is secured is not material except as a matter of expense. Stamps would do it or a tube mill process like that to be used by the United East em, but H. R. Zimmer, inventor of the system, has adopted the Marks pull verizer as being more economical. It likewise is a centrifugal process. Rock comes from the crusher as coarse as twO-inch pieces. These are run into the Marks centrifugal pull verizer in the lower part of which are the screens. All that which is not reduced to the required mesh is elevated and goes through the pull verized again. The pulverizer handles 50 tons a day. The Zimmer separator handles 25 tons, so that it takes two separators to handle the output of one pulverizer.
 The amalgam is taken out of the separator and retorted. Thus the gold and silver are secured and that is all there is to it. It takes from 31 to 32 pounds of quick for each bowl and that amount amalgamates ten pounds of gold. The quick is merely placed in the bottom of the bowl and the motion places it in the grooves where it belongs. The only loss of quick is in retorting. There are no losses due to powdering and of float ing away as on plates.
 The saving of gold and silver in the free run from 90 to 97 per cent, ac- eording to information furnished by the inventor This has been tested out on Oatman ores. Five sacks of ore were sent to MT. Zimmer at Los An geles by E. B. Bettis, of the Mazona Mining company, from the Gold Dust property. It assayed $21.48. On that total the loss was 92 cents. The gold value was S20.87 and of this it lost 82 cents. The silver value was 61 cents and it lost 10 cents.
 From the Sure Shot group, out by the Times, another sample was sent. Its assay value was S20.25 in gold and saved all but fl cents. Its silver value was 61 and saved all but 6 cents. Both were 100 mesh.
 The Yellow Aster mine sent a sam pie and got about the same general result, but on a coarser mesh, as the Oatman ores. The Yellow Aster peo- ple stated after the tests that the use of the separators alone would save their company S1200 a month in pow CT, not to mention the increased gold saving.
 A sample of United Eastern ore was tried, but it was crushed only to 40 mesh. The saving, however, was be tween 91 and 92 per cent.
 One recorded test is of an outside free milling ore going s2.02 ton, part of which was silver. Some of the sil- yer was not saved but the gold saving was 100 per cent. Tests on sign painters gold leaf were made in the presence of several witnesses who were sworn and they claim a saving of 97 per cent. This was mixed with sand, linseed oil raw and boiled, crease, paint and various other sub stances.
 Varinns tests with sr1Inhides ara