Author: Robert McGarraugh

Publisher: Forgotten Books

Published: 2016-11-27

Total Pages: 134

ISBN-13: 9781334408991

Excerpt from Mine Bookkeeping: A Comprehensive System of Records and Accounts for Mining Operations of Moderate Dimensions To make an intelligent analysis of the work at hand, the cost of performing each operation must be determined in terms of the unit involved; this unit may be ton of ore milled, ton of ore stoped, foot of drift or crosscut, etc. It is obvious that to be of economic value, a saving in the cost per ton of ore produced must not be accompanied by a corresponding drop in the grade of that ore; on the other hand, an increase in the cost of production may be more than offset by the gain in recovery which has been effected. The grade of ore which can be mined and treated at a profit should be definitely known. It is sometimes the case that this factor has not received suffi cient consideration, or that it has not been kept before those who are responsible for the actual mining operations. Where appreciable variations in mining conditions occur in different parts of the mine, the grade of ore which can be taken out at a profit from each working place should be determined. Ore which assays above this grade can be profitably mined and treated; anything of lower grade can only be handled at a loss and should be left. In case that a shortage of ore which can be mined and treated at an actual profit occurs, the grade at which ore can be handled in preference to running below capacity must be determined. Muck from development faces must be disposed of, and it is then the question whether rock which is already broken and in the car should go to the treat ment plant or over the dump. 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.