Mining Incidents

El Cajon Quarry Metal/Non-Metal

San Diego, San Diego County, CA  ·  Active
MSHA Mine ID: 0400133

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Fatalities
0
Total incidents
18
Years on record
2000–2024
Latest incident
May 2024
Compliance record
MSHA citations since 2000
131
citations
43
significant & substantial
$68,452
proposed penalties
$43,887
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2025 Q4 10,045 0 0 0.0
2025 Q3 10,367 0 0 0.0
2025 Q2 11,512 1 0 86.9
2025 Q1 645 7 2 10852.7
2024 Q4 631 0 0 0.0
2024 Q3 13,598 0 0 0.0
2024 Q1 550 2 1 3636.4
2023 Q4 14,308 0 0 0.0
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

18 on file

2024 · 2 incidents

May 14, 2024 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Struck by falling object

Miner stated that a piece of angle iron fell off the steel rack and smashed fingertip between the rack support.

January 20, 2024 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Robertson's Ready Mix Ltd · Struck by... (Not Elsewhere Classified)

Miner was cutting conveyor belt and razor knife jumped and cut EE's thigh.

2023 · 1 incident

February 16, 2023 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech DISORDERS (REPEATED TRAUMA)
Robertson's Ready Mix Ltd · (Not Elsewhere Classified)

Miner has had an audiometric standard threshold shift in R-ear, pending retest, results won't be available within the 10-day reporting criteria. Miner has been exposed to work noise for 12-years and wears ear plugs for protection. Miner experiences ringing in their ear.

2022 · 2 incidents

April 18, 2022 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Robertson's Ready Mix Ltd · Struck by flying object

Miner was breaking oversized rock with a sure-strike attachment. Though the excavator was boomed out fully, fly rock hit & broke both the windshield & plexiglass protective shield causing miner to get glass in eye.

February 14, 2022 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech STEPPING OR KNEELING ON OBJECT
Robertson's Ready Mix Ltd · Struck against stationary object

Miner stepped on a rock and rolled ankle when walking down stairway to primary.

2021 · 4 incidents

December 7, 2021 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Robertson's Ready Mix Ltd · Over-exertion (Not Elsewhere Classified)

Walking down stairs from primary and twisted left ankle.

September 24, 2021 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Robertson's Ready Mix Ltd · Fall to the walkway or working surface

Tightening a nut with a pipe wrench when the wrench broke causing employee to fall back onto catwalk injuring arm and hand.

July 31, 2021 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Robertson's Ready Mix Ltd · Over-exertion in wielding or throwing objects

States pain occurred in left chest and ribs while swinging a sledge hammer.

March 11, 2021 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Struck by falling object

Was working on a return-roller hanger bracket, when last bolt was removed the weight of belt caused the bracket to drop rapidly and broke EE's middle finger on right hand.

2020 · 1 incident

December 28, 2020 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Robertson's Ready Mix Ltd · Fall onto or against objects

Miner claims to have slipped stepping down an A-frame ladder & injured shoulder at the primary, but wasn't witnessed by those working in the area. Didn't mention it to foreman until 1/5/2021, foreman did not take action as no medical issue was stated. We were notified by the staffing agency of the injury on 1/19/2021.

2019 · 1 incident

April 2, 2019 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
Robertson's Ready Mix Ltd · Struck against a moving object

Tipped water truck on the side. neck strain, lumbar strain.

2018 · 4 incidents

November 27, 2018 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Struck by... (Not Elsewhere Classified)

Miner was engaging the manually operated locking pins to secure the bucket on a skid steer. When EE initially pushed on it the handle got stuck. EE applied more pressure when it broke free the handle pinching EE's finger, fracturing it.

October 17, 2018 CA · Metal/Non-Metal mine manager, mine foreman, mine owner HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Struck by flying object

Removing a gear component when a metal fragment struck miners left arm, causing a laceration and embedding in arm.

September 22, 2018 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Struck by falling object

Miner was reinstalling a troughing roller when it fell striking left hand. Fractured left middle finger, laceration left middle finger.

June 11, 2018 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Caught in, under or between a moving and a stationary object

While clearing jaw crusher a large rock shifted into miners leg and foot, causing contusions to leg and foot

2017 · 1 incident

August 23, 2017 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Robertson's Ready Mix Ltd · Over-exertion (Not Elsewhere Classified)

Miner was changing parts on a crusher when a part started to fall. The miner tried to hold onto the part. The miner strained left shoulder.

2007 · 1 incident

April 13, 2007 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Hanson Aggregates Pacific Southwest Inc · Struck against stationary object

Employee was prying worn rubber that had been siliconed to a chute with a crowbar. When the rubber came loose the crowbar slipped from the employee's grasp causing the bar to drop to the ground which caused the employee to drop to his knees striking his left knee on the center hold down bolts of a screen.

2000 · 1 incident

March 14, 2000 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Hanson Aggregates Pacific Southwest Inc · Struck by... (Not Elsewhere Classified)

EE WAS USING A BOTTLE JACK AND A PIECE OF PIPE TO RAISE THE ENGINE ON A LOADER. HE RAISED THE FRONT OF THE ENGINE AND INSTALLED A 1" PLATE TO MAKE ROOM TO REMOVE THE OIL PAN. THE EMPLOYEE LOWE RED THE JACK AND REMOVED THE JACK AND PIPE. THE PIPE SLIPPED OUT OF HIS HAND AND FELL ON HIS ARM CAUSING A LACERATION TO THE LEFT ARM.