Patents Assigned to Coreplugs Limited
  • Stemming
    Patent number: 4214532
    Abstract: In mining and quarrying an explosive charge is placed in a shot hole, and the subsequent explosion is contained by stemming. The invention provides stemming made from stemming plugs, each consisting of a self-supporting body made principally of sand bound with the aid of sodium silicate. The plugs are wetted, preferably by immersion in water, and inserted into the shot hole where they are crushed or disintegrated to form the stemming.
    Type: Grant
    Filed: May 15, 1978
    Date of Patent: July 29, 1980
    Assignee: Coreplugs Limited
    Inventor: Bryon T. Oulsnam