Handbk Of Rock Excavation Meth PDF Download

Excerpt from Rock Excavation: Methods and Cost The value of the mineral products of America annually exceeds $1,000,000,000. For explosives alone the sum of $20,000,000 is expended each year, and it is well within limits to say that fully twice as great a sum is paid out to drillers and blasters. When we consider the labor, the power and the powder required to mine and to quarry products in the aggregate so enormously valuable, we can not fail to be impressed with the scantiness of literature on the economics of rock excavation. A dozen years ago, when called upon to estimate the cost of some open cut rock excavation, I was astonished to find no text book that in the least served to guide me. I subsequently learned also that most of the matter to be found in the few books on blasting was either theoretic or too meagre to be of material value. What was true then has unfortunately remained true. In the preparation of this volume, it was my original intention to give only condensed cost data on rock excavation - including in that term, quarrying, open cut work, trenching, tunneling, and underground excavation; but, as the writing progressed, it become more and more apparent that methods of doing work and "tricks of the trade" should occupy an important part of the book to make it at all satisfactory. I saw that my object should be not merely to furnish data whereby an inexperienced man might predict the cost of rock work with at least tolerable accuracy, but that it should be my aim also to indicate to the experienced manager how and where savings in the cost of production may be effected. Taking my own notes and records of cost as a basis, I have added so extensively to them by correspondence that the reader will find not a little on costs that has never appeared in print before. 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.