The Mineral Industry, Volume 20 (Google eBook)

Front Cover
Scientific Publishing Company, 1912 - Mining industry and finance
0 Reviews
  

What people are saying - Write a review

We haven't found any reviews in the usual places.

Related books

Other editions - View all

Common terms and phrases

Popular passages

Page viii - Silver: peso. Gold: 10 and 20 crowns. Gold: 10 sucres ($4.8665). Silver: Sucre and divisions. Gold: pound (100 piasters), 5, 10, 20 and 50 piasters. Silver: 1, 2, 5, 10 and 20 piasters. Gold: 20 marks ($3.859), 10 marks ($1.93). Gold: 5, 10, 20, 50 and 100 francs. Silver 5 francs. Gold: 5, 10 and 20 marks.
Page viii - Silver 5 francs. Gold: 5, 10 and 20 marks. Gold: sovereign (pound sterling) and i sovereign. Gold: 5, 10, 20, 50 and 100 drachmas. Silver: 5 drachmas. Gold: 1, 2, 5 and 10 gourdes. Silver: gourde and divisions. Gold: sovereign (pound sterling). Silver: rupee and divisions. Gold: 5, 10, 20, 50 and 100 lire.
Page 345 - Where very clayey slime is to be filtered, as much fine sand (limited as stated above) should be crowded into the pulp as it will carry without undue settling and clogging. 8. No. 10 canvas supported by slats gives the best all-round service for the thick cake, and No. 12 canvas on wire netting answers the requirements for the thin-cake filtering-machines. 9. "With slimes containing a large proportion of colloid or clayey material pressures greater than those obtainable with vacuum apparatus are...
Page 344 - Pressure-filters, or filters in which hydrostatic head, compressed air or pumps are used in order to secure greater pressures than are possible with a vacuum-pump. These filters are intermittent in their action. C. Ordinary filter-presses. D. Sluicing filter-presses (Merrill filter-press). E.
Page 287 - The industries already stimulated t>y this line strikingly illustrate the importance of railway communication in Alaska. Although a large part of the gold still comes from the placers, much progress was made during 1911 in paving the way for an increased output from auriferous lodes. This work was carried on in most of the gold-bearing areas of Alaska, but the most notable advances were in the Juneau, Valdez, Kenai Peninsula, Willow Creek, and Fairbanks districts.
Page 355 - Quickly empty the contents of the blue phial, of the white phial, and of the magnesia package into the metal receptacle, and stir well with the spoon. This should be done as rapidly as possible, as the patient's chance of life depends on promptness. Administration of the Antidote. If the patient is conscious, make him swallow the mixture at once and lie down for a few minutes. If the patient is not conscious, place him on his back and pour the mixture down his throat in small quantities, if necessary...
Page 345 - The temperature of the wash water and the pulp should be the same. 6. Vacuum pressures should be varied until the proper intensity for the given slime is obtained. 7. Where very clayey slime is to be filtered, as much fine sand (limited as stated above) should be crowded into the pulp as it will carry without undue settling and clogging.
Page 345 - The proportion of clayey material in ores which are to be subjected to "all-sliming" and filtration should be maintained at a minimum. 2. The slime-pulp should be as free as possible from sands coarser than a No. 150 screen, and as large a proportion of the pulp as possible should consist of material passing a No. 200 screen. 3. The slime-pulp before filtration should be settled to as thick a consistency as possible consistent with ready...
Page 344 - ... solution and displace the remainder with water, or to thicken the slime by settlement and decantation, and then to filter and displace the remaining solution by water. The mechanical appliances in use for filtration are grouped as follows : I. Suction-filters, or filters in which a vacuum is used to accelerate filtration. A. Appliances using a thin slime-cake and practically continuous in their action. (Oliver and Ridgway filters.) B. Appliances using a thick slime-cake and intermittent in their...
Page 345 - The slime-pulp before filtration should be settled to as thick a consistency as possible consistent with ready handling by pumps and in pipes. 4. The temperature of the slime-pulp should be maintained between 20 and 30 C. or higher. 5. The temperature of the wash-water and the pulp should be the same. 6. Vacuum-pressures should be varied until the proper intensity for the given slime is obtained. 7. Where very clayey slime is to be filtered, as much fine sand...

Bibliographic information