Author: H R Gault
Publisher: Forgotten Books
ISBN: 9780365186854
Category :
Languages : en
Pages : 24
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Book Description
Excerpt from Zinc-Copper Deposit at Tracy Arm Petersburg District Alaska The area in the vicinity of Tracy Arm is underlain mainly byk'a group of northwest-trending metamorphic rocks that flank the west edge of the Coast Range batholith. (see pl. These rocks are here subdivided into three zones: an eastern zone of light-brown schists; a central zone of dark-green schists, black phyllites and gray-green schists and a western zone of light-green chlorite schists. The bound aries, based in part on lithology and in part on degree of metamorphism, are not sharply defined. The metamorphic rocks are bordered on the east by quartz diorite gneiss of the Coast Range batholith. Silicic dikes and Sills that seem to be genetically associated with the batholith also have intruded the metamorphic rocks. Lamprophyre dikes are' the youngest igneous rocks in the area and intrude both the quartz diorite gneiss and the schists. 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: Hugh Richard Gault
Publisher:
ISBN:
Category : Copper ores
Languages : en
Pages : 366
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Book Description
Author: Hugh Richard Gault
Publisher:
ISBN: 9780461142457
Category : History
Languages : en
Pages : 376
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Book Description
This is a reproduction of the original artefact. Generally these books are created from careful scans of the original. This allows us to preserve the book accurately and present it in the way the author intended. Since the original versions are generally quite old, there may occasionally be certain imperfections within these reproductions. We're happy to make these classics available again for future generations to enjoy!
Author: H. R. Gault
Publisher:
ISBN:
Category : Copper ores
Languages : en
Pages : 11
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Book Description
Author: Hugh Richard Gault
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: Hugh Richard Gault
Publisher:
ISBN:
Category : Copper ores
Languages : en
Pages : 13
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Book Description
Author: G. D. Robinson
Publisher: Forgotten Books
ISBN: 9780365948254
Category : Science
Languages : en
Pages : 44
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Book Description
Excerpt from Some Lead-Zinc and Zinc Copper Deposits of the Ketchikan and Wales Districts, Alaska: Zinc and Lead Deposits of Southeastern Alaska According to the Wrights (p. 171) limestone and schist constitute the principal bedrock exposures within this area, and on the west side of the bay these are intruded by a wide area of granite, which also forms the west shore of Dora Lake. 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: H. R. Gault
Publisher: Forgotten Books
ISBN: 9781528228381
Category : Science
Languages : en
Pages : 68
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Book Description
Excerpt from Some Zinc-Lead Deposits of the Wrangell District, Alaska Timberline in Groundhog Basin is at an altitude of about feet. Near the cabin are good stands of spruce and hemlock that are suitable for general mine and camp use. During the summer of 1942, members of the U. S. Geological Survey made a detailed investigation of the zinc deposits of Groundhog Basin and in 1943 mapped the continuation of the deposits south into Glacier Basin. Prior' to these investigations only brief studies of the deposits had been made (wright and Wright, 1948, p. 188 - 189; Buddington, 1923, p. 58 - 63) 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.
