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 timber 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
      non-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.