On April 11, 2010, a 61-year old contract iron worker/mine fireboss with 20 years of mining experience was fatally injured while installing pre-fabricated metal stairs on the side of a fan housing. The stair stringer had been hoisted into place and clamped at the top with two “locking pliers-type” C-clamps. The bottom of the inclined stringer was lying on a 6×6 inch timber. To level the stair treads, a 6×6 inch timber was going to be replaced with a 4×4 inch timber. To replace the 6×6 timber, rigging was fastened near the lower part of the stringer. The victim was standing on the ground holding the handrails. As the lower end of the stringer was hoisted by the crane, the clamps opened and the top end of the stringer fell. This caused the bottom end of the stringer to pivot up and swing out. This pushed the victim backward and pinned him against a nearby manlift.
- Ensure that all personnel stay clear of hoisted loads and areas where loads may fall if hoisting fails.
- Know the limitations of temporary supports and ensure they are used within their specifications.
- Ensure all components are adequately blocked and secured to prevent unintended motion.
- Use taglines on loads to be hoisted that will need steadying or guidance.
- Ensure that crane operators communicate with other workers in close proximity to loads that are going to be moved.
- Ensure that personnel are trained to recognize hazardous work procedures.
- Discuss work procedures and identify all hazards associated with the work to be performed, along with the methods to protect personnel.
Click here for: MSHA Investigation Report(pdf)