Download or read book Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania Classic Reprint written by N. H. Darton and published by Forgotten Books. This book was released on 2018-02-08 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania In mining coal in the anthracite region of Pennsylvania the general custom has been to leave a large percentage of the coal in place as pillars to support the roof. Evidently any practice that involves partial waste of an important mineral resource is bound to be dis carded. It is well recognized that one method of obviating probable waste is to fill the workings with cheap or worthless materials, a process extensively employed in the anthracite and some European mines. At present many of the collieries in the anthracite region of Pennsylvania are utilizing refuse from the old culm banks, which formerly were prominent features in the landscape, and are flushing the fine waste underground so that pillars may be reduced in size or removed. As a result the banks are now disappearing and soon will be gone. The fine culm from the breakers and rock from the mines will continue to be available, but the volume of these materials is insufficient to replace any considerable proportion of the coal removed. The next stage of progress suggested is the use of sand. Fortunately there are available large deposits of this material, much' of which can be handled by dredges and pumps. This report is issued by the Bureau of Mines in the interest of safer and more efficient mining methods. Its purpose is to describe the sand deposits in the northern anthracite coal field in Luzerne and Lackawanna Counties, Pa. Much of the information available is presented in the map, Plate I. Field studies, mostly preliminary, were made in the summer of 1911 to determine the distribution, amount, and character of the larger deposits. It was not thought desirable to make a detailed examination of the region because when the coal companies decide to utilize the sand their engineers will make precise surveys and drill test holes. 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.
Download or read book Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania written by Nelson Horatio Darton and published by . This book was released on 1913 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania by N H Darton written by Nelson Horatio Darton and published by . This book was released on 1913 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sand for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania written by Nelson Horatio Darton and published by . This book was released on 1913 with total page 33 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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