The Sentinel Integrity Rockbolt is a new concept in rockbolting safety. The
Sentinel is a modified AT rockbolt which can signal to the Mine Rockbolting
Engineer whether it is broken and, if so, where.
Bolt failure can occur due to overloading and/or corrosion and when it occurs
it can be difficult to detect. We recommend that a row of Sentinel bolts is
placed across the tunnel at regular intervals as substitutes for the standard
rockbolts. The exact spacing would depend upon local circumstances.