On December 23, 2010, a 35 year- old contract blaster with 12 years of experience died at a crushed stone operation. After firing the blast, he immediately walked into the blast site to examine the shot material. The victim was approaching the edge of the shot material when the ground collapsed, engulfing him in the water-filled pit.
Best Practices
- Conduct effective workplace examinations in areas where contractors are working. Identify all hazards, and take action to correct them.
- Establish mining plans based on geological evaluations and implement procedures to effectively protect all persons.
- Establish methods to identify subsurface cavities and voids such as advance drilling and geophysical surveys (ground penetrating radar – GPR), electrical resistivity, or other available methods.
- Wait at least 15 minutes or longer before conducting post-blast inspections. Take additional time if geological anomalies or other hazards are identified during drilling or blasting.
- Keep a safe distance from cracks or any other signs of unstable ground conditions.
- Tie off using a secure anchorage zone.
- Wear a life jacket where there is a danger from falling into water.
Click here for: MSHA Preliminary Report (pdf), MSHA Investigation Report(pdf), Overview(powerpoint), Overview (pdf).