Professional Paper Volume . 76-77

Professional Paper Volume . 76-77

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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 edition. Excerpt: ...has been renovated and is run for a part of each year on old dumps and tailings with good profit reported. In Empire Canyon several small temporary plants have been established from time to time for reworking the tailings from the Daly West and Daly-Judge mills. The one which remained longest was equipped with a Wilfley table, for which power was obtained by means of an overshot water wheel. It was currently reported that this plant paid, but when tonnage shipped and assay values of concentrate were checked against working expenses the balance did not appear to be favorable. Some hand-jigging of natural concentrates that was done in Silver Creek below the town and near the sampler does not appear to have proved successful. Tailings from Woodside Canyon are hauled to a plant in town where they are further concentrated and sold, it is reported, at a profit. The new tailings mill at the Daly West mine has caused lessees on creek tailings below to abandon further work, and the only slimes which are allowed to pass the King mill are those which the manager deems too low in grade to pay for treatment in the filter press. TREATMENT OF ZINC ORES. An important problem in handling the ores ot this district is to separate and to save the zinc blende, and various attempts to solve it have been made. An entire plant was recently erected for this purpose, and at date of writing some recent experiments are reported to have been successful. Considerable zinc blende occurs in the sulphide ores, more particularly in those from the deeper parts of the veins and from the western section of the district. Among the large producers the only mines that yield ore carrying much zinc are the Daly West and Daly-Judge. The average percentages of the main constituents in more

Product details

  • Paperback | 260 pages
  • 189 x 246 x 14mm | 472g
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236547713
  • 9781236547712