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Excerpt from Methods of Mine-Timbering There is no attempt in this Bulletin to present a complete treatise on methods of mine timbering, but simply to give consideration to those systems ordinarily used in, or adapted to, the gold mines of California. Both in the lode and deep gravel mines of this State, those systems in use have been selected from the best practice and applied in various ways according to circumstances. In collecting the material herewith presented, many mines have been visited and the details of timbering work noted, so that those who have not an opportunity of comparing methods for themselves may be enabled to learn the practice of others. It has been thought proper also to give some detailed account of systems of mine timbering used in other States where extensive ore-bodies are worked, since these are adapted to use here under corresponding conditions. 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.
Excerpt from Mine Timbering This book is a collection of articles that have previously been printed in the Engineering and Mining Journal, The Mineral Industry, and the transactions of various societies, the source being stated in a_ foot-note to each article. The article by Mr. Macdonald was published originally in the Proceedings of the Canadian Mining Institute, and that by Mr. Parlee in the Pro ceedings of the Canadian Society of Civil Engineers. Permission to make this republication has been courteously granted by the Secretaries Of both those societies, and the respective authors have cooperated with suggestions and in the reading of proof. The last part of the book is made up chiefly of articles that have appeared in the Engineering and Mining Journal during the last two or three years. In the absence of any treatise on this impor tant subject, which in the hand-books and text - books on mining is dealt with only in a superficial way, it has appeared worth while to make the present collection, which is Offered not as a complete treatise on the subject, but rather as a series of essays which go fully into many important details. It is hoped that a thorough and systematic treatise on mine timbering will soon be written. Editor. 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.
Excerpt from Coal Mine Surveying The rapid depletion of the primitive forests of America by fires and axe in recent years has raised the price of wood so rapidly that the mining industry is becoming alarmed as to its future supply of the big timber of which it has hitherto been such a prodigal consumer. Economy in the use of timber has been essential to commercial success in European mining for several generations and it was to the Old World that our operators went for their first systems of timberless mining. The use of steel and masonry for the support of mine shafts and tunnels has long been practised in Europe not only because of dear timber but because most mines there are considered to be long-term investments rather than temporary speculations. As this replacement of timber supports by other material involves no new mining system and has been thoroughly covered by other writers, it will not be described in this treatise. Though most of the mining methods considered consume some timber, their economy in that respect is so marked as to justify the use of a title Mining without Timber. 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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Excerpt from The Decay of Mine Timbers Speaking generally. The meet of the question mic}: is usually thought of is that of obtaining a from supply either for renewing old mine timbers. Or for eupportiog new cuttinge. It seems on the other hand to be generally taken for granted that. 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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Excerpt from Forestry and Coal Mining Until within comparatively recent years the prevailing practice in the lumber industry has been to organize an operation on a period basis; to con struct a plant of a capacity to utilize the amount of timber within a specified period of years; and to finance the operation so that when the last tree is cut the total investment will be liquidated. The plant, then, and the cut-over land have only a sal vage value. The land often must be abandoned. A Sustained Yield plan of operation recognizes the fact that timber grows; that with proper care in logging and protection the land will continuously produce successive new crops of timber indefinitely. The investment, then, in plant and land becomes permanent; it does not have to be written off at the end of a specified term of years; both plant and land continue to be productive and valuable. The forestry department of the Corporation is operated on a Sustained Yield basis. 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.