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.