Mining Incidents

El Cajon Quarry Metal/Non-Metal

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

El Cajon Quarry has $68K in proposed MSHA penalties and $0 outstanding across 5 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
32
Years on record
1987–2024
Latest incident
May 2024
Compliance record
MSHA citations since 2000
133
citations
45
significant & substantial
$68,452
proposed penalties
$43,887
paid to date
64% of proposed penalties paid to date, a $24,565 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
81
inspections on record
1,498
inspection hours
8.9
citations per 100 inspection hours
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.
133 citations across 1,498 inspection hours.
Source: MSHA inspections data, updated weekly.

El Cajon Quarry has $68K in proposed MSHA penalties and $0 outstanding across 5 contested dockets.

Penalty disposition
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$68K
proposed penalties
$44K
current assessed
$44K
paid to date
$0
outstanding
130 assessments are final orders; 5 contested dockets.
As of the most recent assessment on 2026-02-10.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Quarterly safety rates
Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
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 12,210 1 0 81.9
2025 Q1 12,772 7 2 548.1
2024 Q4 14,121 0 0 0.0
2024 Q3 14,272 0 0 0.0
2024 Q2 14,356 1 0 69.7
2024 Q1 14,519 2 1 137.8
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 14,308 0 0 0.0
2023 Q3 14,531 4 1 275.3
2023 Q2 14,181 0 0 0.0
2023 Q1 12,677 6 4 473.3
2022 Q4 14,090 0 0 0.0
2022 Q3 13,346 2 0 149.9
2022 Q2 11,655 0 0 0.0
2022 Q1 11,284 2 0 177.2
2021 Q4 11,682 0 0 0.0
2021 Q3 12,895 0 0 0.0
2021 Q2 13,021 2 1 153.6
2021 Q1 11,623 0 0 0.0
2020 Q4 11,702 3 2 256.4
2020 Q3 10,421 0 0 0.0
2020 Q2 11,429 6 1 525.0
2020 Q1 12,486 1 1 80.1
2019 Q4 12,057 0 0 0.0
2019 Q3 12,123 0 0 0.0
2019 Q2 10,119 4 1 395.3
2019 Q1 13,315 1 0 75.1
2018 Q4 12,515 1 0 79.9
2018 Q3 12,438 1 0 80.4
2018 Q2 13,730 7 4 509.8
2018 Q1 12,858 0 0 0.0
2017 Q4 14,442 5 3 346.2
2017 Q3 17,239 0 0 0.0
2017 Q2 17,028 7 4 411.1
2017 Q1 16,742 0 0 0.0
2016 Q4 17,114 2 0 116.9
2016 Q3 17,393 0 0 0.0
2016 Q2 18,200 0 0 0.0
2016 Q1 16,344 2 0 122.4
2015 Q4 13,606 2 1 147.0
2015 Q3 14,829 3 3 202.3
2015 Q2 15,696 0 0 0.0
2015 Q1 13,207 0 0 0.0
2014 Q4 12,236 0 0 0.0
2014 Q3 11,135 0 0 0.0
2014 Q2 8,621 1 1 116.0
2014 Q1 9,274 0 0 0.0
2013 Q4 7,997 2 0 250.1
2013 Q3 8,636 3 1 347.4
2013 Q2 6,252 5 3 799.7
2013 Q1 6,073 0 0 0.0
2012 Q4 4,546 0 0 0.0
2012 Q3 3,630 3 2 826.4
2012 Q2 3,473 0 0 0.0
2012 Q1 689 0 0 0.0
2011 Q4 1,029 0 0 0.0
2011 Q3 5,460 0 0 0.0
2011 Q2 5,979 1 0 167.3
2011 Q1 4,592 0 0 0.0
2010 Q4 5,673 4 1 705.1
2010 Q3 7,013 1 0 142.6
2010 Q2 6,302 1 0 158.7
2010 Q1 5,329 0 0 0.0
2009 Q4 5,197 1 0 192.4
2009 Q3 5,923 0 0 0.0
2009 Q2 5,033 0 0 0.0
2009 Q1 3,480 0 0 0.0
2008 Q4 3,444 0 0 0.0
2008 Q3 3,268 3 1 918.0
2008 Q2 3,550 0 0 0.0
2008 Q1 5,532 0 0 0.0
2007 Q4 6,839 0 0 0.0
2007 Q3 8,839 1 0 113.1
2007 Q2 8,582 0 0 0.0
2007 Q1 6,918 0 0 0.0
2006 Q4 4,609 0 0 0.0
2006 Q3 3,489 1 0 286.6
2006 Q2 3,347 0 0 0.0
2006 Q1 3,655 0 0 0.0
2005 Q4 4,897 3 0 612.6
2005 Q3 3,930 1 0 254.5
2005 Q2 3,370 1 0 296.7
2005 Q1 4,133 1 0 242.0
2004 Q4 5,218 1 0 191.6
2004 Q3 5,948 0 0 0.0
2004 Q2 6,685 0 0 0.0
2004 Q1 6,048 0 0 0.0
2003 Q4 4,861 0 0 0.0
2003 Q3 5,434 0 0 0.0
2003 Q2 4,531 0 0 0.0
2003 Q1 5,469 0 0 0.0
2002 Q4 5,380 3 0 557.6
2002 Q3 5,370 0 0 0.0
2002 Q2 5,600 0 0 0.0
2002 Q1 5,572 1 0 179.5
2001 Q4 5,094 0 0 0.0
2001 Q3 5,615 0 0 0.0
2001 Q2 5,728 0 0 0.0
2001 Q1 5,624 0 0 0.0
2000 Q4 6,972 7 1 1004.0
2000 Q3 6,578 0 0 0.0
2000 Q2 4,524 0 0 0.0
2000 Q1 6,379 12 3 1881.2
No fatalities recorded at this mine.

Reportable incidents

32 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.

1999 · 1 incident

April 13, 1999 CA · Metal/Non-Metal HANDLING OF MATERIALS
Hanson Aggregates Pacific Southwest Inc · Over-exertion in lifting objects

EMPLOYEE WAS PERFORMING A REPAIR TO REPLACE THE LEAKING SEAL OF THE HYDRAULIC TANK SITE GLASS. DURING REPLACEMENT OF COVER, ANOTHER EMPLOYEE WASASSISTING THE INJURED WORKER. DURING LIFTING, THE EMPLOYEE FELT A PINCH TO HIS LOWER LEFT SIDEBACK.

1996 · 1 incident

February 29, 1996 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Hanson Aggregates Pacific Southwest Inc · Caught in, under or between a moving and a stationary object

EMPLOYEE WAS PRYING AND MOVING ROCKS IN SAW CRUSHER. HAND SLIPPED OFF OF A ROCK HE WAS MOVING AND IT SMASHED HIS 3RD FINGER TIP ON RIGHT HAND.

1994 · 1 incident

October 5, 1994 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Hanson Aggregates Pacific Southwest Inc · Struck by rolling or sliding object

EMPLOYEE WAS PREPARING TO DISLODGE ROCKS FROM THE CAVITY OF A KUE KEN JAW CRUSHER WITH A PRY BAR. WHILE ATTEMPTING TO DISLODGE THE ROCKS, A ROCK WEIGHING APPROX. 75 LBS SLID DOWN A SLIDE AT A 45 DEGREE ANGLE FOR APRPOX. 4.2 FEET MAKING CONTACT WITH EMPLOYEE'S LEFT HAND PINKY FINGER.

1993 · 2 incidents

October 4, 1993 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Hanson Aggregates Pacific Southwest Inc · Over-exertion (Not Elsewhere Classified)

EMPLOYEE WAS HELPING INSTALL A ROCK GUARD. HE LIFTED THE GUARD WRONG AND STRAINED HIS LOWER BACK.

February 3, 1993 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech ENTRAPMENT
Hanson Aggregates Pacific Southwest Inc · Caught in, under or between (Not Elsewhere Classified)

EMPLOYEE WAS INSTALLING A 2" PVC WATER LINE IN A TRENCH THAT AS 36" SIDE, 7' DEEP, 30' LONG. WHILE HE WAS INSTALLING THE WATER PIPE (PVC), APPROXIMATELY 1 TON OF MATERIAL BROKE AWAY FROM THE S IDE WALL OF THE TRENCH, PINNING HIM WASTE DEEP IN THE TRENCH.

1992 · 3 incidents

October 16, 1992 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Hanson Aggregates Pacific Southwest Inc · Struck by... (Not Elsewhere Classified)

EE WAS INSTALLING SCREENS ON HEWIT ROBINS SCREEN WHILE TIGHTENING TENSION BOLTS HE MISSED AN HIT HIS LEFT HAND, INDEX FINGER WITH A 4 LB HAMMER.

October 13, 1992 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Hanson Aggregates Pacific Southwest Inc · Over-exertion in lifting objects

EMPLOYEE WAS LIFTING WEAR PARTS FOR CRUSHER WHEN HE STRAINED HIS BACK.

August 31, 1992 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Hanson Aggregates Pacific Southwest Inc · Over-exertion (Not Elsewhere Classified)

EMPLOYEE WAS HAND LOADING A PALLET WITH USED IMPACTOR (ROCK CRUSHER) WEAR PARTS, WHEN HE COMPLAINED OF A SHARP PAIN IN HIS LUMBAR REGION OF HIS BACK.

1991 · 1 incident

November 7, 1991 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator POWERED HAULAGE

EMPLOYEE WAS REMOVING AN OVERSIZE ROCK FROM THE KUE KEN JAW CRUSHER. AFTER RIGGING A CABLE SLING AROUND THE ROCK, HE REMOVED HIMSELF FROM THE CAVITY OF THE CRUSHER. AS THE LOADER WAS LIFTING T HE ROCK OUT OF THE CAVITY, THE CABLE SLIPPED OFF THE ROCK. POLEVAULTING HIM HEAD FIRST INTO THE CRUSHER. HE FELL APPROX. 4 1/2 FEET.

1990 · 1 incident

February 1, 1990 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Hanson Aggregates Pacific Southwest Inc · Fall onto or against objects

CHECKING CRUSHER CHAMBER ON UNIT MISPLAE R FOOT CAUSED HIM TO FAL ON CATWALK HIT CRUSHER FRAME WITH R HAND

1989 · 2 incidents

January 27, 1989 CA · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger DISORDERS (REPEATED TRAUMA)
Hester'S Granite Pit · Over-exertion (Not Elsewhere Classified)

OPER STATEMENT WRONG KING OF BUCKET IS ON CRA(E OPER HAS TO LIFT BUCKET A(D SPIKE BRAKE HARD 9 TIMES A MIN. WE BELIEVE THE ILLNESS IS REULT OF THIS OPER DEGENERATIBE JOINT DISEASE.

January 12, 1989 CA · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger SLIP OR FALL OF PERSON
Hester'S Granite Pit · Over-exertion (Not Elsewhere Classified)

OPER WALKING ON MUDDY TRACK SLIPED.

1988 · 1 incident

September 22, 1988 CA · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger SLIP OR FALL OF PERSON
Hester'S Granite Pit · Fall from machine

OPER JUMPED OFF MACHINE PAIN IN R. KNEE. DR. VISSIT TO RE EXAM 1-11-89 NO TIME LOST.

1987 · 1 incident

July 29, 1987 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Hester'S Granite Pit · Absorption of radiations, caustics, toxic and noxious substances

HYDRAULIC ROOM CRACKED SPRAYING HYDRALIC OIL ON OPERATOR.

For insurers, brokers, and safety consultants

The full compliance file on El Cajon Quarry

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.