Geology and Ore Deposits of Boise Basin, Idaho (Classic Reprint)
Geology and Ore Deposits of Boise Basin, Idaho (Classic Reprint)

Author: Alfred L. Anderson

Publisher: Forgotten Books

Published: 2017-10-28

Total Pages: 262

ISBN-13: 9781528322812

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Excerpt from Geology and Ore Deposits of Boise Basin, Idaho Most of the deposits are of moderate size, but the lodes are not uniformly mineralized, and the ore shoots are generally discontinuous and the ore Spotty. The ore shoots are controlled by the effects of movement directed obliquely upward along irregular fissures and by zones of Oblique tension fractures across and along broader zones of shearing. Structural reopening at the end of the base-metal stage of deposition has also been an important factor in the control and distribution Of the precious-metal ore. Thermal zoning has apparently limited the vertical range Of gold and silver deposition, and few of the ore shoots appear to have extended downward for more than 500 feet. The lodes have the general structural, textural, and mineralogical features of the epi thermal precious-metal and base-metal deposits. They were Obviously formed at comparatively shallow depths with the precious-metal ore limited to a narrow vertical range in Spite of favorable structural Openings below the limits of present workable ore bodies. 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.

Structural Control of Mineral Deposits
Structural Control of Mineral Deposits

Author: Alain Chauvet

Publisher: MDPI

Published: 2019-04-16

Total Pages: 256

ISBN-13: 3038977845

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"Structural Control” remains a crucial point that frequently lacks in any scientific and/or economic analysis of ore deposits, whatever their type and class. The case of lode deposits is exemplary, although also other deposits, like breccia pipe, stockwerk, massive sulphides, skarn, etc., can, surprisingly, be concerned. Several concepts like the gold-bearing shear zone have not proven valid during the last few decades in terms of our understanding of gold deposit and have been totally abandoned. Additionally, the relationships between magmatism, regional tectonic context, and mineralization remain uncertain and have been debated in several recent publications. This demonstrates that this issue is still relevant, and its solution may help in the distinction between intrusion-related and orogenic deposits. In this Special Issue, we particularly invite any case study of mineral deposits, in which it has been demonstrated that structural geology may have a significant role in the establishment of the deposit model of formation and/or on exploration and exploitation programs. Examples in which the structural model diverges from those described in the classical literature are particularly welcomed, including studies in which relationships with magmatism can be suspected and/or demonstrated. Indeed, all cases that illustrate concepts that differ from the classic ones and from theoretical models may represent significant contributions to this volume.

The Principal Rare Earth Elements Deposits of the United States-A Summary of Domestic Deposits and a Global Perspective
The Principal Rare Earth Elements Deposits of the United States-A Summary of Domestic Deposits and a Global Perspective

Author: Keith R Long

Publisher: Scholar's Choice

Published: 2015-02-16

Total Pages: 108

ISBN-13: 9781298051011

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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.

Geology of Colorado and Western Ore Deposits (Classic Reprint)
Geology of Colorado and Western Ore Deposits (Classic Reprint)

Author: Arthur Lakes

Publisher: Forgotten Books

Published: 2017-09-12

Total Pages: 370

ISBN-13: 9781528051200

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Excerpt from Geology of Colorado and Western Ore Deposits This treatise contains the substance of a series of elementary lectures delivered by the author to the students of the Colorado State School of Mines. It is published with a view of meeting some of the needs of the general public, of the ordinary miner, and of the unscientific many, rather than with an idea of offering technical matter for the discussion of the scientific few. The materials are derived from the writer's own researches, and from the most reliable resources available to him, such as the standard text-books and the valuable published reports of the United States Geological Survey. The writer having for a time been connected with that survey, knows full well how high a value is to be attached to those reports, which must remain for all time as a standard of reference for those interested in the geological relations of the mines of Colorado and Western States. The first part of the work contains a rough sketch of general Geology, for the benefit of those who are not familiar with the terms used in this science. The sketch is further applied to the local geology of Colorado. The second part refers to the phenomena of veins and ores, and their surroundings, as illustrated by Colorado. 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.