Mining American Volume 55

Mining American Volume 55

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1907 edition. Excerpt: ...operation of the smelters--which has not hitherto been possible--and thus assure a steady market for United States' products. In any event, there is already apparent an increase of zinc mining operations in both British Columbia and Mexico, while there is no reported falling off in the domestic output. The result of the pending appeal to the recent ruling of the New York Board of Appraisers by the Treasury Department relative to the dutiability of sulphide ores, is anxiously awaited. The admittance of sulphides duty-free may more seriously affect the industry in this country, inasmuch as blende constitutes the bulk of the outputNew Mexico being the only really important calamine or carbonate ore producer in the West. SET RULES IN MINE EXAMINATIONS. Anyone who has had an extended field experience in examining mining properties must have realized that "Nature abhors a straight line" and can not be coerced by any hard and fast rules, whether they be laid down by text books, or by the imagination or dictates of those whose experiences are limited to the laboratory, the class room or the business desk. ' Parties at a distance may request an engineer to examine and report on a property, giving him exact information according to certain requirements of their own, ---for example, the number of tons of coal in a large coal property, or the number of tons and value of ore said to be "in sight" in a metal mine. Such parties have often little conception of the actual difliculties of the field, and the impossibility of fulfilling such requirements other than approximately. Take for instance a large, undeveloped coal property, covering several square miles; a statement is required of the number of tons in it per square...
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Product details

  • Paperback | 610 pages
  • 189 x 246 x 31mm | 1,075g
  • United States
  • English
  • black & white illustrations
  • 1236978552
  • 9781236978554