Sand Available for Filling Mine Workings in the Northern Anthracite Basin of Pennsylvania (Classic Reprint) - Couverture souple

Darton, N. H.

Couverture souple

ISBN 10 : 1334489319 ISBN 13 : 9781334489310

Editeur : Forgotten Books, 2019

Synopsis

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 m 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 m 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.

Détails de l'édition

• Éditeur: Forgotten Books
• Date d'édition: 2019
• Langue: anglais
• ISBN 10: 1334489319
• ISBN 13: 9781334489310
• Reliure: Broché
• Nombre de pages: 50
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