The tonage required to mine and mill ores to obtain one unit of metal is a hyperbolic function of the grade, and as the tonnage increases hyperbolically, so does the energy consumed. For copper, this ratio suggests that deposits with grades inferior to 0.20-0.25 percent will not be mined for common electrical and construction uses. Curves and tables show these calculations for other metals as well.

  • Corporate Authors:

    Department of the Interior

    1849 C Street, NW
    Washington, DC  United States  20240
  • Authors:
    • Page, N J
    • Creasey, S C
  • Publication Date: 1975-1

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00125828
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Files: TRIS
  • Created Date: Oct 18 1975 12:00AM