Patents Assigned to Potash Corporation of Saskatchewan Mining Limited
  • Patent number: 4649524
    Abstract: This invention relates to an integrated acoustic network system to provide warning of impending groundfall in underground mines. The system includes a plurality of geophones which derive acoustic signals by which the source of seismic disturbances is located, and an array of high frequency piezoelectric sensors which pick up signals from small ground disturbances which precede groundfall. A warning system is provided both at the scene of mining operations and at a central location of impending groundfall and of the location of its occurrence.
    Type: Grant
    Filed: August 22, 1983
    Date of Patent: March 10, 1987
    Assignee: Potash Corporation of Saskatchewan Mining Limited
    Inventor: James B. Vance