U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Preconcentration of native copper and porphyry copper ores by electronic sorting.

Public Domain


Details

  • Personal Author:
  • Description:
    The Bureau of Mines developed a detector for controlling sorting devices to separate the copper-bearing fragments from the barren portion of Michigan native copper and western porphyry copper ores. A successful sorter could be used to preconcentrate the ore and eliminate costly hoisting or hauling of waste. An induction balance unit was developed and used in sorting tests on crushed size minus 2.5 Plus 1.3 Cm (minus 1 plus 1/2 inch) ores from the Kingston (0.9 pct cu) and Centennial (1.6 pct cu) Mines of upper Michigan. Concentrates of 4.0 pct and 7.5 pct cu were obtained at recoveries of 85 and 80 pct of the copper in the feed. Eighty percent of the sorted ore was rejected as tailing. Sorting larger fragments improved the separation efficiency. Tests on minus 10 plus 5 cm (minus 4 plus 2 inches) size Kingston (1.6 pct cu) and Centennial (2.1 pct cu) ore samples yielded concentrates of 4.3 and 4.5 pct cu with corresponding recoveries of 92 and 91 pct. About 60 pct of the sorted ore was discarded as tailing. Porphyry copper sulfide ores also responded to electronic sorting but at a lower separation efficiency. Sorting response was affected by the degree of segregation. [Description provided by NIOSH]
  • Subjects:
  • Series:
    Mining Publications
  • ISSN:
    0026-5187
  • Document Type:
    Text
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Division:
    RORC - Rolla Research Center
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    30
  • Issue:
    8
  • NIOSHTIC Number:
    nn:10009741
  • Citation:
    Min Eng 1978 Aug; 30(8):1194-1201
  • Federal Fiscal Year:
    1978
  • Peer Reviewed:
    True
  • Source Full Name:
    Mining Engineering
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
  • Download URL:
  • File Type:
    Filetype[PDF - 168.02 KB ]
PREVIOUS
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP