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Mineral Resources of Michigan with Statistical Tables of Production and Value of Mineral Products for Volume 10

Mineral Resources of Michigan with Statistical Tables of Production and Value of Mineral Products for Volume 10


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About the Book

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. 1913 Excerpt: ...each side of a nearly vertical fault. The shaft passed through the lode and at the elevation of the first level a crosscut was driven south about 100 ft. to the lode which was found to be badly faulted." WILMOT MINING COMPANY. Idle. WASHINGTON COPPER MINING COMPANY. This company's property will be explored by the reorganized Keweenaw Copper Co. WEST MINNESOTA MINING COMPANY. Idle. WHEALKATE MINING COMPANY. Idle. WINONA COPPER COMPANY. Balance of assets December 31, 1912, $62,034. After a period of development and construction work, the property is now in shape to make larger and more economical production. Profit from operations should be made in the near future, if the price of copper remains good and sufficient laborers can be secured. The company's mill was completed early in 1911 and production begun in March. Owing to a considerable percentage of the copper in the ore being in a finely divided state, much experimentation has been necessary that a good recovery may be made. It has been found advisable to install regrinding apparatus--Hardinge conical pebble mills--and additional concentrating tables. At present one head is working continuously, but the second head is only occasionally in operation as labor shortage at the mine prevents desired production being obtained. In 1911 there was stamped 97,445 tons of ore yielding 1,275,675 pounds copper, an average of 13.09 pounds per ton. The recovery made during the first four months of operation of the mill was about 12 pounds per ton, but improvements made brought the average up. The production at present is from No. 3 and No. 4 shafts, chiefly from the latter. Much work has been done underground in preparation for production. Shafts and drifts have been retimbered. In places dry walls have been used, ...


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Product Details
  • ISBN-13: 9781130945423
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130945421
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr


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