Annual Report of the Mining Department Volume 21

by ,

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1912 edition. Excerpt: ...the Southern Railroad. The Blue Gem seam is worked; it has an average thickness of 24 inches. The roof is slate, and the bottoml is fire clay. It is developed on the single entry system. Ventilation is produced by natural means. Haulage is conducted from rooms to knuckle, by mules, the distance being 3 ...

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Annual Report of the Mining Department Volume 21 2013, Rarebooksclub.com

ISBN-13: 9781234291693

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