overbreak

Any material removed beyond the neat line is overbreak.

Each person has a unique special ability called an OverBreak or OB.

If these steps are not taken heavily jointed formations may be "overblasted" with subsequent overbreak and damage to walls.

The collapse occurred because of heavy overbreak (during excavation) at a geologically complex area inside the tunnel and delayed the completion of the south-bound tunnel.

The manner in which the results of monitoring were used to assess the possibilities of damage to adjacent structures, and to determine acceptable blasting intensities to control overbreak is discussed.

With the risk to human safety thus reduced, stability concerns within the stopes are primarily driven by the economics of unplanned overbreak and waste rock dilution of the mined ore.

Mine planners, blasters and design engineers will be able to adjust patterns based on jointing characteristics to minimize overbreak and reduce underbreak resulting in more competent support and safer openings.

It calls for a compromise between the competing objectives of maximum yield and fragmentation, minimum overbreak, underbreak and backbreak, and minimum costs for drilling, explosives, rockbolting and other forms of support.