MINECRIB
Underground mines specify MineCribTM concrete cribbing block, manufactured at Rock Springs Block Co., for a number of reasons:

   * Concrete MinecribTM block provides immediate  support of the
       mine roof and does not shrink  like wood timber.

   * Wood timer deteriorates in the damp, underground mine 
     environment, but concrete MinecribTM block actually gain strength
     as they continue to cure!

   * MineCribTM cribbing block can support more than 900 tons and
      will not yield. Plywood compression panels on the bottom of each
      not yield crib enable supervisors to monitor total roof  loading,

   * MineCribTM blocks are handled and set in place with a forklift, 
      reducing labor costs and installation time for roof supports.