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Ground broken beyond the design line of blast holes most recently detonated.
Overbreak on the right wall of a large underground excavation.
Backfill sheets are provided to charging operations to enable over length holes to be brough back into tolerance with the design charge depth.
A complete backfill sheet contains the following information:
Ballistic Discs provide a safe and effective way of remotely clearing hang ups and upstanding rill in draw points and stopes. When detonated a ballistic disc produces a large steel slug that is propelled at hypersonic velocity (2000-2600 m/s). The kinetic energy transferred on impact, up to 60 MegaJoules with the BD514, shatters the target area. As accurate aiming is paramount, provision for
Blast Clearance Zone
The area around a blast that must be evacuated of personnel and equipment during the firing of a blast.
The clearance zone is identified on the firing plan which will also show blast guard positions and other information relevant to the firing.
A blast guard is a person responsible for ensuring the blast clearance zone is evacuated prior to the firing of a blast.
The attached document provides detailed information on the practice of blast guarding.
A mat made of rope, rubber strips, polyethylene tube or similar material, placed over the area or materials being blasted to prevent the scattering of blast-generated debris.