Panel System of Coal Mining: A Graphical Study of Percentage of Extraction
Language: English
Published by Forgotten Books, 2018
- Softcover
- New
Seller: Forgotten Books, London, United KingdomForgotten Books
AbeBooks seller since June 2, 2021
Condition: New
£ 13.99
Quantity: Over 20 available
Add to basketItem description from seller
Print on Demand. This book provides a graphical analysis of coal extraction, focusing on the panel system used in mining. The author investigates the relationship between extraction percentage and various dimensions of mine workings, such as room width, length, and the number of rooms per entry. By presenting the results in tables and diagrams, the book simplifies the understanding of complex calculations involved in determining extraction efficiency. The author emphasizes the importance of increasing the ratio of room width to pillar width and extracting pillar coal to achieve higher extraction percentages. However, the book acknowledges the practical challenges and safety concerns associated with excessive pillar width reduction. Overall, this book offers valuable insights for mining engineers and professionals seeking to optimize coal extraction while maintaining safe and efficient operations. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book.…
Seller Inventory # 9781332779123_0
- Title
- Panel System of Coal Mining: A Graphical Study of Percentage of Extraction
- Author
- C. M. Young
- Publisher
- Forgotten Books
- Publication year
- 2018
- Condition
- New
- Book Type
- print-on-demand item
- Binding
- Paperback
- Language
- English
- ISBN 10
- 1332779123
- ISBN 13
- 9781332779123
- Seller catalogs
- General Engineering
While no general rule can be stated for the determination of the dimensions of pillars and of the ratio of pillar area to room area necessary for the permanent support of the surface at a given depth, it is known that the relative area of pillars must be made greater as the depth increases. Experience in Illinois shows that the surface cannot be permanently sustained over the deeper and thicker beds of the State unless about half of the coal is left. This statement is true in general for Districts V, VI, and VII, of the Illinois Coal Mining Investigations, which include bed 5 in Saline and Gallatin counties and nearly all mines in the No. 6 coal.
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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Forgotten Books
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Forgotten Books’ Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the quality of the aged text.
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Forgotten Books publishes hundreds of thousands of rare and classic books.
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.
This text has been digitally restored from a historical edition. Some errors may persist, however we consider it worth publishing due to the work's historical value.
The digital edition of all books may be viewed before purchase if you request a sample.
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