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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 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. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
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 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. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
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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 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. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. To ensure a quality reading experience, this work has been proofread and republished using a format that seamlessly blends the original graphical elements with text in an easy-to-read typeface. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated.1868 Excerpt: ... for the extraction of gold, and several attempts have been made to introduce more economical and more efficient means of pulverizing than are afforded by the ordinary stamp batteries. Of a system lately brought into use, Mr. Michel speaks as follows: --"I had occasion, shortly before my visit to Nova Scotia, to see in operation at the Harvey Hill mine, in the province of Quebec, a new system of machinery, which promises to revolutionize the mechanical treatment of auriferous minerals. I speak of the mills of Messrs. Whelpley and Storer, of Boston, which consist of a crusher and a pulverizer, whose construction I shall not attempt to describe, but shall-only mention the results which I saw. The apparatus at Harvey Hill was arranged for pulverizing the tender copper-bearing slates of that locality; but three trials were made in my presence with auriferous quartz from the Chaudierc district, each trial upon one-third of a ton. Eighteen minutes were required to reduce one ton of quartz to a coarse powder fit for the pulverizer; and the latter machine in forty-two minutes reduced the ton of quartz to a powder as fine as that-of most of the stamp mills in Nova Scotia. The quartzose copper slates of Leeds were pulverized much more rapidly, and reduced to an impalpable powder; and I am persuaded of the truth of what I was told by the mecanician in charge of the mills, that a similar result would have been obtained with the quartz, had the pulverizer been adjusted for the purpose." It is proper in this connection to mention the use of Eodiuui-amalgam in the extraction of gold. It often happens that a portion of the gold in the quartz, from the presence of an enveloping film, or from some other reason not well understood, is not readily moistened by the mercury, and c...