Download or read book The Dredging of Gold Placers written by John Ernest Hodgson and published by . This book was released on 1911 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Dredging of Gold Placers Classic Reprint written by John Ernest Hodgson and published by . This book was released on 2015-07-21 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Dredging of Gold Placers During the past two years the writer has contributed to English and American periodicals several articles, dealing with the phase of mining to which the following pages are devoted. Some interest appears to have been aroused among both mining men and the lay public by these articles, and the wish has often been expressed that they should be incorporated in one volume. This book is an attempt to meet that desire. The industry is a comparatively new one, and the views of dredging men in regard to many questions, both of construction and design, are still in a state of flux. This book is offered to the world, therefore, not by any means as a technical work, but in the sincere hope that it will help and interest company directors, property managers, prospectors, and those of the investing public who have acquired, or think of acquiring, a share interest in a gold-dredging concern. 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.
Download or read book Gold Dredging in the United States Classic Reprint written by Charles Janin and published by Forgotten Books. This book was released on 2018-09-04 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Gold Dredging in the United States The recovery of gold from sands and gravels is one of the oldest forms of mining; it antedates history and has been practiced by savage peoples. In North America the search for placer gold has been a powerful agency in the exploration and development of unknown regions and has profoundly influenced the course of our civilization. With the progress of invention, the improvements in machinery, and the availability of large capital for the conduct of great operations, the tendency in placer, as in many other branches of mining, has been toward the working of extensive but comparatively low-grade deposits. The early miner washed the rich spots in stream beds or terraces with his pan, his long tom, and his primitive sluice. Then followed the growth of hydraulic mining and the use of giants supplied with water under pressures of hundreds of pounds to the square inch that could work at a profit gravels whose gold tenor was less than 3 cents to the cubic yard. Finally came the dredge that could handle deposits lying so far below water level as to be beyond attack by other methods. Although the gold dredge was first successful on a commercial scale in New Zealand, it has reached its present strength and efficiency in this country and its development is a monument to the daring, per severance and technical skill of the many men, mine owners and engineers who have each contributed something to the final result. The Bureau of Mines, authorized to conduct investigations for the purpose of increasing efficiency in the mineral industries, had its attention called some years ago to the need of a comprehensive report on gold dredging in the United States. The director of the bureau recognized that such a report should summarize the development of the gold dredge, should describe in detail the essential features of present-day dredges, should discuss the facts that determine whether a placer deposit can be profitably dredged, and should point out the approved methods of prospecting placer ground and of operating dredges. 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.
Download or read book The History and Development of Gold Dredging in Montana written by Hennen Jennings and published by Forgotten Books. This book was released on 2017-10-28 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The History and Development of Gold Dredging in Montana: With a Chapter on Placer-Mining Methods and Operating Costs Although the purpose of this paper is to describe gold dredging in Montana, a brief mention of some early appliances used in New Zealand, Australia, and California may serve as a world-connecting link in our consideration of the development of gold dredging. 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.
Download or read book Drilling for Placer Gold Classic Reprint written by Walter H. Gardner and published by . This book was released on 2015-08-05 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Drilling for Placer Gold The Keystone Drill, as universally used, is not an instrument of precision. Gold particles are not distributed with mathematical symmetry. One drill hole to an acre in ground that is 50 feet in depth only yields for examination part of the whole! Ordinary common sense and care on the part of the operator and panner are sufficient to insure acceptable field work. Meticulous precision or elaborate core measurements are generally absurd. For after the depths have been recorded and the gold weighed, there comes the calculation of the values of precious metal in great blocks of gravel. There is no fixed formula. The experienced Engineer, to whom such work should be entrusted, will compensate for high variations, for loose and swelling ground, for sand and clay, for rusty gold - and his calculations will of necessity contain approximations that eclipse minor errors of the field and nullify minute measurements. Indeed, field work with the Keystone Drill need not be conducted by men of profound skill. Just so the work is done in a consistent manner under the occasional eye of a competent engineer; just so the results are interpreted in the light of experience - then will the final figures carry the full weight of authority. There is no mystery about field work - and should there be, the following pages will clarify the mode of procedure. 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.
Download or read book The Dredging of Gold Placers written by John Ernest Hodgson and published by Palala Press. This book was released on 2016-06-22 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book The Dredging of Gold Placers Primary Source Edition written by John Ernest Hodgson and published by Nabu Press. This book was released on 2014-03 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a reproduction of a book published before 1923. This book may have occasional imperfections such as missing or blurred pages, poor pictures, errant marks, etc. that were either part of the original artifact, or were introduced by the scanning process. We believe this work is culturally important, and despite the imperfections, have elected to bring it back into print as part of our continuing commitment to the preservation of printed works worldwide. We appreciate your understanding of the imperfections in the preservation process, and hope you enjoy this valuable book.
Download or read book The Dredging of Gold Placers With Illustrations written by John Ernest HODGSON (F.R.G.S.) and published by . This book was released on 1911 with total page 65 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Cripple Creek Gold Fields Placers Lodes Classic Reprint written by Colorado Midland Railway Company and published by Forgotten Books. This book was released on 2017-10-22 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Cripple Creek Gold Fields, Placers, Lodes April, 1885. It is true, that the supposed rich deposit of gold was deposited there by human hands for speculative purposes; that the great mine in the new El Dorado was salted, but there was gold within so short a distance of the place where this piece of knavery was practiced, that it seems almost miraculous the mining district was not located at the time. Many an old prospector has examined the outcroppings, and one was even confident enough to run a tunnel into the hill directly under the spot where one of the richest deposits has since been located, but none succeeded in finding the gold. 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.
Download or read book The Dredging of Gold Placers Scholar s Choice Edition written by John Ernest Hodgson and published by . This book was released on 2015-02-12 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Dredging for Placer Gold written by Stewart River Gold Dredging Co and published by . This book was released on 1909 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Recent Progress in the Thawing of Frozen Gravel in Placer Mining Classic Reprint written by Charles Janin and published by Forgotten Books. This book was released on 2018-01-16 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Recent Progress in the Thawing of Frozen Gravel in Placer Mining Dredging methods for gold placers and the construction and opera tion of gold dredges were described in Bulletins 121 1 and 127 2 of the Bureau of Mines. The working of frozen gravels, a special problem in placer mining, has received much attention in Alaska and the Yukon Territory, and the methods evolved there are described in this paper. In placer mining in the far North one of the greatest difficulties encountered is the permanently frozen condition of the ground. In the early days of mining the ground was thawed by the primitive method of building wood fires on the surface, at the bottom of a shaft, or at the face of a drift. Although this method was slow and costly, a more effective one was not discovered until about 1898, when Mr. C. J. Berry3 noticed that the steam escaping from the exhaust of a hoisting engine had thawed a hole in the solid muck. Mr. Berry picked up the exhaust pipe (a rubber hose), applied it elsewhere, and found the steam thawed the ice and moss so rapidly as to permit the full length of the hose to penetrate the ground Within a few minutes. Further experiments followed. At first a rifle barrel and then a short piece of iron pipe, pointed at one end, was used for penetrating the ground, rubber hose being attached to convey the steam. The direct application of steam through points proved so effective that it became the chief method adopted in thawing many millions of cubic yards of gravel for drift, surface mining, and dredging operations. As a result of experiments, changes were made in the shape of the steam point, better methods of application were devised, and the best number of points to be used in a unit and the distances at which points should be spaced to get the maximum benefit were determined. 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.
Download or read book Gold Dredging the New Industrial written by Henry Stanhope Bunting and published by . This book was released on 1903 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Mining Industry in the Territory of Alaska During the Calendar Year 1915 Classic Reprint written by Sumner S. Smith and published by Forgotten Books. This book was released on 2018-02-12 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from The Mining Industry in the Territory of Alaska During the Calendar Year 1915 The output of placer gold showed a slight decrease over 1914, which was partly due to the partial exhaustion of the placers, but also to the fact that many of the operators owning ground tributary to the line of the Government railroad prefer to await the comple tion of the road, when comparatively cheap coal may be obtained, rather than to pay the present excessive price for wood. As the cost of fuel for thawing frozen placers constitutes a large part of the total mining cost, the delay is warranted. The output of placer gold for 1915 is valued at as compared with in 19143' More than 30 gold dredges were busy in the summer of 1915, and the construction of several new ones was started. The value of the output from dredging declined slightly, being in 1915 and in 1914. 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.
Download or read book Placer Gold Dredging Using an Excavator and Floating Processing Plant written by Fortymile Placers (Firm) and published by . This book was released on 1993 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Gold Dredging written by Cecil Clement Longridge and published by . This book was released on 1905 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sixteen Months at the Gold Diggings Classic Reprint written by Daniel B. Woods and published by . This book was released on 2015-07-22 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: Excerpt from Sixteen Months at the Gold Diggings It is almost inconceivable what an excitement was produced upon nations and individuals by the discovery, less than four years since, of gold among the mountains of Upper California. Tides of human life soon set in toward this one point; currents here met, whirling and contending with increasing force; and, where all was silent and calm before, was heard the roar, and seen the violence and agitation of the maelstrom. The writer was for sixteen months employed in the gold mines, chiefly upon the American and Tuolumne Rivers and their tributaries. His reasons for compiling his notes and presenting them to the public may be briefly stated. It was the request of several friends that he would keep a journal of his mining life, exhibiting its lights and shades, its fortunes and misfortunes. This he did, jotting down from day to day the incidents as they occurred. Many mining companions, aware of this fact, requested him to prepare his journal for the press, that their friends might thus have a view of their circumstances and employments. 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.
