Author: John Adams Church
Publisher:
ISBN:
Category : Comstock Lode (Nev.)
Languages : en
Pages : 272

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Author: John A. Church
Publisher: Forgotten Books
ISBN: 9780282853150
Category : Science
Languages : en
Pages : 252

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Excerpt from The Comstock Lode: Its Formation and History IT is fitting that a work on the structure of the Comstock Lode should be introduced by a description of the method employed in mining upon it. The known limits of the lode cover a space of feet, in a nearly due north and south direction (magnetic). At the time the existing mine maps were laid out, the variation of the needle in. That locality was 161} degrees east. The northern half of the lode has a direction a little more to the east than the magnetic meridian, and the southern half a strike which again is slightly more to the east than its neighbor. Great irregularities in the course occur locally, the strike varying in fact from north-east to north-west within short distances. Still the mean direction of the lode is almost coincident with the line of mag netic north. 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.

Author: John Adams Church
Publisher: Palala Press
ISBN: 9781356994823
Category :
Languages : en
Pages : 246

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This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced from the original artifact, and remains as true to the original work as possible. Therefore, you will see the original copyright references, library stamps (as most of these works have been housed in our most important libraries around the world), and other notations in the work.This work is in the public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.As a reproduction of a historical artifact, this work may contain missing or blurred pages, poor pictures, errant marks, etc. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.

Author: George F. Becker
Publisher: BoD – Books on Demand
ISBN: 338539984X
Category : Fiction
Languages : en
Pages : 446

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Reprint of the original, first published in 1882.

Author: George Ferdinand Becker
Publisher:
ISBN:
Category : Comstock Lode (Nev.)
Languages : en
Pages : 486

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Author: Eliot Lord
Publisher: BoD – Books on Demand
ISBN: 3385313031
Category : Fiction
Languages : en
Pages : 466

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Reprint of the original, first published in 1883.

Author: Ferdinand Richthofen
Publisher: Theclassics.Us
ISBN: 9781230241647
Category :
Languages : en
Pages : 20

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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. 1866 edition. Excerpt: ... Farther north, this rock covers the country to great extent. Sanidin-trachyte has never been found to contain silver-bearing veins; and in Washoe none occur in it, and yet it has evidently been mainly instrumental in the formation of the Comstock lode and other veins in that region. No geological events after that epoch are worth noticing, for our present object. Eruptions of basaltic rocks were considerable in adjoining parts of the Great Basin, but have been of little consequence in Washoe. Volcanic and eruptive activity gradually died away, and we behold now their last stages in the action of thermal springs, such as Steamboat Springs. The surface underwent but slow and gradual denudation; and the events of the volcanic period are recorded so perfectly and distinctly in the nature and association of the rocks, as to aid us greatly in explaining the mode of formation of the Comstock vein. GENERAL STRUCTURE OF COMSTOCK VEIN. The Comstock vein runs, nearly in the direction of the magnetic meridian (the variation being fifteen degrees east) along the eastern slope of the Mount Davidson range, which descends at a steep grade until it abuts against the gentle slope of three " Flats," on which, at an altitude of from five thousand eight hundred to six thousand two hundred feet, are situated the towns of Virginia, Gold Hill, and American City. The outcroppings of the vein extend in a broad belt along the foot of the steep grade and immediately above the three towns. The course of the vein, as far as yet explored, is somewhat dependent on the shape of the slope, as it partakes of all its irregularities, passing the ravines in concave bends and inclosing the foot of the different ridges in convex curves; the greatest convexity is around the...

Author: Grant Horace Smith
Publisher:
ISBN:
Category : Comstock Lode (Nev.)
Languages : en
Pages : 297

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Author:
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 456

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Author:
Publisher:
ISBN:
Category : Mineral industries
Languages : en
Pages : 940

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