This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 Excerpt: ... passing through it, containing about 40 to 45 percent, water. The author remarks that it can also be seen in the case of grinding pans that coarse sand cuts away the shoes and dies much quicker than fine sand but that, when the shoes and dies of a pan in good order are found to wear quickly, it is a sign that the pan has its full load. In the case of the tube mill, however, when the liners and flints show an undue amount of wear, it is accepted as a sure sign that the mill is underloaded.--Journal of the Chemical, Metallurgical, and Alining Society of South Africa, September. The Clarification of Cyanide Solutions.--Jones.--In discussion of a paper by Truscott and Yates, of the use of the filter Eress for clarifving solutions, mentioned previously in the Digest, Ir. Acheson Jones gives the result of his experience with the use of filter presses at the new plant of the Meyer and Charlton Mines on the Rand. This plant had two clarifying tanks, each 20 feet in diameter by 5 feet deep, with the usual filter bed, with mat and jute covered by 14 inches of coarse sand. The filtering capacity of these tanks was soon found to be too small, while the labor and time wasted in cleaning up the layer of accumulated slime was considerable. An old Johnson press of 34 cells, 30 inches square and 1 inch deep was therefore installed which had a filter area of 425 square feet. The Meyer and Charlton plant uses cyanide solution throughout and therefore the gold value of the return mill solution is kept down. For this purpose the press is connected with the return launder by a 3-inch pipe. With a head of 24 feet 500 tons of solution can be clarified per day and go directly to the extractor boxes. The press is sufficiently high Tor a truck to be run under and is cleaned out abou...