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The School of Mines Quarterly, Vol. 7
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Excerpt from The School of Mines Quarterly, Vol. 7: October, 1885, to July, 1886 After the gold has been boiled it is collected in an iron scoop, emptied into a lead-lined tub where it is washed several times by de cantation, and then transferred to a wooden vat upon wheels, lined with 6-pound lead, where the sweetening is completed. This tank is 28 by 33 inches and 17 inches deep. A wooden filter filled with holes is placed upon its bottom, the top Of which is 4 inches above the bottom. The bottom is made to incline towards the center and from the lowest point there is a pipe which is made to communicate with the reservoir into which the liquid is to run. The wooden filter is carefully covered with a cloth and the gold is put upon this cloth and washed once with cold and twice with hot water until it is en tirely sweet. This takes from two to three hours. When the gold is 'quite sweet it is pressed into cakes by a hydraulic press. These cakes are twelve inches in diameter and three inches thick, and weigh from 130 to 150 pounds. The cakes of gold are dried in an oven heated with steam. They are then broken up and melted in graphite crucibles and uxed with a cover of bone ash into which nitre is introduced as in the silver melting. The material remaining in the furnace from three to five hours is then cast into bars which run from to fine. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
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