Mining Methods Beneficiation And Smelting Of Copper Ores

Author : Donald F. Macdonald
Publisher : Forgotten Books
ISBN 13 : 9780656244300
Total Pages : 154 pages
Book Rating : 4.2/5 (443 download)

DOWNLOAD NOW!

Download or read book Prospecting and Mining of Copper Ore at Santa Rita, New Mexico (Classic Reprint) written by Donald F. Macdonald and published by Forgotten Books. This book was released on 2018-02-10 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Prospecting and Mining of Copper Ore at Santa Rita, New Mexico It is a far cry from the small and uncertain mining efforts of 50 years ago to the splendidly equipped and solidly financed organiza tions that now handle thousands of tons of ore per day. The old mining was largely speculative; the new is practically on a manu facturing basis. In the' oldidays of mining the aim was, chiefly, to find comparatively rich ore; modern practice looks more toward efficiency in mining and milling, so that vast tonnages of low-grade material may be worked at a profit. The old operators had faith and hoped for good returns; the new ascertain with a fair degree of precision what the available tonnage is, what the cost of mining and treating the ore will be, the time necessary to exhaust the deposit, the capital required, and the net profits to be made. The old mining was financed on a highly speculative basis, and the value of mining stock was largely controlled by the imaginations of the promoters and of the individual holders. In the new regime the financing of mines is often as conservative as the financing of manufactures or railroads, and the value of stock, quoted on the leading exchanges, is controlled by the carefully estimated profits in sight. Of course, with every legitimate industrial enterprise go certain business risks, and mining is not exempted from these. Then, too, valueless mining as well as valueless industrial stocks are sometimes offered for sale by the intentionally dishonest, or the ignorant. However, the prospective purchaser of a mine nowadays, if he is willing to pay for the services of reputable mining engineers, can obtain information on which to base an opinion as to the quality of his investment. The relatively recent development of cheap and efficient methods of mining and of ore dressing has given value to low-grade ore bodies that a few years. Ago were almost valueless. The iron mines of northern Minnesota have been fruitful in developing efficiency in mining methods, notably the open-cut methods in which steam shovels strip off the overburden and then load the ore directly into railroad trains for transport to the furnace. In 1907 open-lcut mining was applied to the low-grade copper ores of Bingham, Utah, with splendid results, and since then it has won a most important place in the min ing of large masses of low-grade ores in several other mining regions, especially at Santa Rita, N. Mex. 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.