On July 25, 2016, a 59 year old Excavator Operator, with 17 years of experience, was killed at a limestone quarry. Prior to the accident, the victim was loading shot rock into haul trucks. While waiting for the haul trucks to return, the victim was separating out over sized rocks when the cab of his excavator was struck by falling material from the highwall.
Best Practices
- Operate excavators with the cab perpendicular to, and swinging away from, the highwall.
- Examine highwalls from as many perspectives as possible (bottom, sides, and top/crest) while maintaining the safety of the examiner(s). Look for signs of cracking or other geologic discontinuities.
- Maintain access to the top of highwalls so that thorough examinations can be conducted.
- Perform supplemental examinations of highwalls, banks, benches, and sloping terrain in the working area during and following inclement weather.
- Immediately remove all personnel exposed to hazardous ground conditions, barricade, and/or post signs to prevent entry, and promptly correct unsafe conditions.
- Use mining methods that ensure highwall stability and safe working conditions.
- Look, Listen and Evaluate your highwall and pit conditions daily, especially after each rain, freeze, or thaw.
- Establish and discuss safe work procedures for working near highwalls. Be your own examiner and find hazards before they find you.
Refer to PIB P10-09 ‘Safety Precautions for Operating Rubber Tired and Track-Mounted Excavators’ for additional information regarding hazards related to operating excavators at surface mines.
Click here for: MSHA Preliminary Report (pdf), MSHA Investigation Report (pdf), Overview (pdf).
On June 27, 2016, a 61-year old Mine Superintendent, with 24 years of experience, was killed at a limestone quarry. The victim was building a ramp to the lower bench, was positioning his haul truck to dump a load of material near the edge of a highwall, and rolled backwards over the 90 foot highwall.
On June 3, 2016, a 24-year old haul truck operator, with 9 months of experience, and a 56-year old hydraulic excavator operator, with 6 years of experience, were killed at a sand and gravel operation. The two miners were working in a pit next to an abandoned roadway embankment, which partially bound an old pit. Waste clay and sand had been placed in the old pit for reclamation purposes. The embankment failed and the tailings and slurry engulfed both miners.
On June 6, 2016, a 34-year-old contract laborer with 7 years of mining experience was fatally injured when a diesel-powered front-end loader fell on him. Working together, another miner and the victim lowered the bucket and put downward hydraulic pressure on the bucket to raise the middle of the loader. Both miners then crawled under the loader. The hydraulic pressure released, allowing the loader to lower, pinning both miners. A mine examiner, who was nearby, lowered the bucket again to raise the loader off the miners. One miner was freed and assisted in removing the unresponsive victim from under the loader. Cardiopulmonary resuscitation (CPR) was performed, but the victim could not be revived.