Since the majority of mines were then using direct current power systems, we were able to use controllers with 3 or more steps of starting
The situation of The Consolidated Mining and Smelting Company of Canada Limited, or Cominco, may be somewhat unique in that the Company is not only
Within recent years portable seismic refraction units have found their place in the industry for shallow investigations. Completely portable, relatively inexpensive and of proven accuracy,
It is truly remarkable how the image of longwall as a method of mining has changed. Today the world looks on longwall in the hope
Fly ash is extremely variable and heterogeneous in all respects except its fine size. Because of its production in huge quantities, it becomes significant as
From time to time since the initial installation of an experimental flotation section in 1940, Permanente Cement Company has made efforts to beneficiate the low-grade
A nickel-copper sulphide concentrate was treated in a pilot plant at Warren Spring Laboratory during 1961, by a hydrometallurgical roast-leach-solvent extraction process devised to cleanly
The author describes the actual processing of the government stockpile of chromiferous sands located at COQUILLE, OREGON, during 1955 and 1956. A general history of
Costs of boring holes in rock have always been a major item in mineral exploration, development, and extraction and in rock excavation in industries other
The Israel Mining Industries Institute for Research and! Development has developed, during recent years, a number of new processes for fertilizer materials. Their phosphoric acid