Mining Incidents

Littlerock Quarry Metal/Non-Metal

Controlled by Robar Enterprises Inc
Littlerock, Los Angeles County, CA  ·  Active
MSHA Mine ID: 0404802

Littlerock Quarry has $124K in proposed MSHA penalties and $0 outstanding across 11 contested dockets, plus health sampling and the full incident record.

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Fatalities
1
Total incidents
37
Years on record
1987–2024
Latest incident
Jun 2024
Compliance record
MSHA citations since 2001
267
citations
94
significant & substantial
$124,496
proposed penalties
$111,503
paid to date
90% of proposed penalties paid to date, a $12,993 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2001
122
inspections on record
2,218
inspection hours
12.0
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.
267 citations across 2,218 inspection hours.
Source: MSHA inspections data, updated weekly.

Littlerock Quarry has $124K in proposed MSHA penalties and $0 outstanding across 11 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.
$124K
proposed penalties
$112K
current assessed
$112K
paid to date
$0
outstanding
262 assessments are final orders; 11 contested dockets.
As of the most recent assessment on 2026-03-18.
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 17,431 0 0 0.0
2025 Q3 15,124 0 0 0.0
2025 Q2 17,486 0 0 0.0
2025 Q1 12,011 10 0 832.6
2024 Q4 15,190 1 0 65.8
2024 Q3 14,235 10 4 702.5
2024 Q2 15,721 1 0 63.6
2024 Q1 13,893 7 3 503.9
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 15,657 0 0 0.0
2023 Q3 14,709 15 9 1019.8
2023 Q2 14,808 0 0 0.0
2023 Q1 12,712 0 0 0.0
2022 Q4 13,702 5 2 364.9
2022 Q3 13,586 0 0 0.0
2022 Q2 12,644 3 1 237.3
2022 Q1 12,083 5 3 413.8
2021 Q4 11,103 0 0 0.0
2021 Q3 13,090 0 0 0.0
2021 Q2 9,539 1 0 104.8
2021 Q1 7,050 0 0 0.0
2020 Q4 13,805 2 0 144.9
2020 Q3 18,432 0 0 0.0
2020 Q2 12,391 0 0 0.0
2020 Q1 17,840 2 0 112.1
2019 Q4 13,657 2 0 146.4
2019 Q3 16,706 0 0 0.0
2019 Q2 14,649 1 1 68.3
2019 Q1 16,069 1 0 62.2
2018 Q4 14,673 0 0 0.0
2018 Q3 17,506 3 2 171.4
2018 Q2 16,838 0 0 0.0
2018 Q1 16,064 5 2 311.3
2017 Q4 11,820 0 0 0.0
2017 Q3 12,702 2 0 157.5
2017 Q2 11,509 1 0 86.9
2017 Q1 12,535 0 0 0.0
2016 Q4 13,143 8 1 608.7
2016 Q3 12,979 0 0 0.0
2016 Q2 12,754 3 0 235.2
2016 Q1 8,864 9 7 1015.3
2015 Q4 11,188 2 0 178.8
2015 Q3 9,666 0 0 0.0
2015 Q2 10,903 2 1 183.4
2015 Q1 9,110 1 0 109.8
2014 Q4 11,895 3 2 252.2
2014 Q3 9,691 2 2 206.4
2014 Q2 11,492 4 1 348.1
2014 Q1 10,403 2 1 192.3
2013 Q4 11,946 0 0 0.0
2013 Q3 9,791 0 0 0.0
2013 Q2 11,447 1 0 87.4
2013 Q1 8,463 0 0 0.0
2012 Q4 10,994 2 1 181.9
2012 Q3 10,021 0 0 0.0
2012 Q2 14,976 2 0 133.5
2012 Q1 9,100 0 0 0.0
2011 Q4 13,177 4 1 303.6
2011 Q3 11,775 0 0 0.0
2011 Q2 8,391 2 1 238.4
2011 Q1 8,045 0 0 0.0
2010 Q4 9,226 1 0 108.4
2010 Q3 9,281 0 0 0.0
2010 Q2 7,197 4 1 555.8
2010 Q1 6,513 0 0 0.0
2009 Q4 8,757 5 3 571.0
2009 Q3 6,898 0 0 0.0
2009 Q2 6,693 2 0 298.8
2009 Q1 6,597 0 0 0.0
2008 Q4 7,247 2 1 276.0
2008 Q3 10,147 3 2 295.7
2008 Q2 10,391 0 0 0.0
2008 Q1 9,409 9 5 956.5
2007 Q4 9,124 0 0 0.0
2007 Q3 10,386 1 1 96.3
2007 Q2 11,853 8 3 674.9
2007 Q1 12,883 0 0 0.0
2006 Q4 14,815 5 4 337.5
2006 Q3 16,150 0 0 0.0
2006 Q2 12,591 19 11 1509.0
2006 Q1 14,085 0 0 0.0
2005 Q4 15,488 8 1 516.5
2005 Q3 16,899 6 4 355.1
2005 Q2 14,024 5 0 356.5
2005 Q1 8,674 0 0 0.0
2004 Q4 11,546 7 2 606.3
2004 Q3 8,269 0 0 0.0
2004 Q2 10,524 19 4 1805.4
2004 Q1 8,885 10 0 1125.5
2003 Q4 12,501 0 0 0.0
2003 Q3 11,642 11 3 944.9
2003 Q2 13,883 0 0 0.0
2003 Q1 10,559 0 0 0.0
2002 Q4 13,631 1 0 73.4
2002 Q3 11,741 5 2 425.9
2002 Q2 15,149 1 0 66.0
2002 Q1 9,350 0 0 0.0
2001 Q4 13,310 0 0 0.0
2001 Q3 10,111 3 0 296.7
2001 Q2 11,150 0 0 0.0
2001 Q1 7,391 6 1 811.8
2000 Q4 8,405 0 0 0.0
2000 Q3 9,508 0 0 0.0
2000 Q2 7,809 0 0 0.0
2000 Q1 7,194 0 0 0.0

Fatalities at this mine

1 recorded
June 14, 2024 CA · Metal/Non-Metal fireman - locomotive, railroad clam operator, timekeeper, yard engine operator Fatality · FIRE
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

988 Loader caught fire, was unable to be extinguished by site personnel, 911 was called. Two fire crews arrived on site, one fireman approached the loader by the rear tire. The plant manager was yelling at them to get away from the tire. It exploded killing the fireman by the tire.

Reportable incidents

36 on file (excluding fatalities above)

2023 · 1 incident

March 11, 2023 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Over-exertion (Not Elsewhere Classified)

Climbing down from equipment on ladder. Felt a "pop" in left knee when when stepping on the ground.

2021 · 1 incident

March 25, 2021 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Hi-Grade Materials Co · Caught in, under or between a moving and a stationary object

Employee was removing the bucket from front end loader and while removing the pins from the bucket, EE pinched EE's left fourth finger in between pins and bucket causing laceration to left fourth finger.

2020 · 2 incidents

December 16, 2020 CA · Metal/Non-Metal MACHINERY
Hi-Grade Materials Co · Accident type, without injuries

Pulling out stuck utility service truck with a backhoe and sustained wheel damage to backhoe.

October 3, 2020 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion in wielding or throwing objects

Employee was shoveling mud near the conveyer belt. Employee lifted shovel full of mud and turned. While lifting and twisting, employee felt back pop and felt pain.

2016 · 2 incidents

February 4, 2016 CA · Metal/Non-Metal welder (non-shop) HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

Employee was holding the scrapper when co-worker swung the sledge hammer and it slipped striking employee on right hand.

2014 · 1 incident

May 20, 2014 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Hi-Grade Materials Co · Caught in, under or between a moving and a stationary object

IE and another EE were changing out a rubber skirt on BC27 (conveyor belt), IE pushed it and it went on top of the belt, IE walked around the pulley to get it off the belt, the other EE continued pushing it and caught IE's finger.

2013 · 1 incident

October 16, 2013 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Over-exertion (Not Elsewhere Classified)

As EE was getting off the loader, foot slipped on wet ladder/step as he held himself up with right arm to avoid falling off the loader he felt pain on his right arm.

2012 · 1 incident

July 9, 2012 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

Rock stuck between blade and liner of dozer; employee used sledge hammer to dislodge rock. Rock came out and hit his left leg, cutting it.

2011 · 1 incident

October 5, 2011 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Caught in, under or between a moving and a stationary object

Shoveling on BC19 clearing return roller, shovel hit the return roller and popped up, employees hand was between the shovel and the conveyor and ripped his left pinky finger nail off.

2010 · 5 incidents

October 13, 2010 CA · Metal/Non-Metal welder (shop) HANDLING OF MATERIALS
Hi-Grade Materials Co · Struck against stationary object

While employee was setting up to wash off wet side slab he bumped his head on conveyor causing laceration to right eyebrow.

August 10, 2010 CA · Metal/Non-Metal welder (shop) HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

EE was using a pry tool to lift flexcos off a conveyor belt, tool slipped and hit him on his lower lip resulting in laceration of lower lip and fracture of 3 teeth.

June 17, 2010 CA · Metal/Non-Metal mine manager, mine foreman, mine owner HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion (Not Elsewhere Classified)

Employee said he had been feeling pain in stomach area since yesterday - at 10:40 am employee was approaching an EE Quarry Foreman when he felt something popped in stomach and curled down in p ain. Employee was taken by EMT to Antelope Valley Hospital. Diagnois: Hernia.

April 2, 2010 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman POWERED HAULAGE
Hi-Grade Materials Co · Struck against a moving object

Employee states that while driving a loader, hit a rock or bump and jarred the loader and hurt his back.

March 17, 2010 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion in lifting objects

One hour after employee was moving a gear box that was hanging on the forklift he felt pain in his lower back.

2007 · 2 incidents

March 5, 2007 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator DISORDERS (REPEATED TRAUMA)
Hi-Grade Materials Co · (Not Elsewhere Classified)

Employee was sent to High Desert Medical Group for yearly hearing exam on 2/1/10 doctor requested to see employee again for a follow up. Employee was seen on 3/22/10 and was recommended to see a specialist for moderate hearing lost. Employee claims the hearing lost began on 3/5/07.

February 26, 2007 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
Hi-Grade Materials Co · Struck by falling object

Rock discharge from crusher, hit conveyor belt and bounced striking employee on side of hard hat.

2005 · 1 incident

July 6, 2005 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

EE SHOULD HAVE BEEN STANDING ON THE GROUND. INJURY UNKNOWN, TEST RESULTS NOT CONCLUSIVE. IMPAIRMENT, UNKNOWN PER DOCTOR ACTIVITIES AS TOLERATED

2002 · 3 incidents

August 13, 2002 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

EE WAS LOOSENING TAIL PULLEY NUT, HAD HIS HAND ON THE NUT, ANOTHER EE SAT DOWN ON THE BELT CAUSING THE TAIL PULLEY TO SLIDE FORWARD, CATCHING HIS HAND.

August 2, 2002 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS CUTTING BOLT HOLES IN THE BELT WITH A UTILITY KNIFE. THE KNIFE SLIPPED CUTTING HIS LEFT HAND.

January 25, 2002 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Fall to the walkway or working surface

EE FELL ON THE SCREW DECK AND LANDED ON HIS BACK.

2001 · 3 incidents

August 22, 2001 CA · Metal/Non-Metal truck driver SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Struck by falling object

EE WAS ASSISTING IN LAYING 0PIPE IN A 3-4 FOOT TRENCH. THE TRENCH COLLAPSED AND BURIED EE TO JUST BELOW THE KNEE.

May 23, 2001 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hi-Grade Materials Co · Struck by falling object

RE-INSTALLING CATWALK. THE CATWALK HIT THE JAW AND THE LEG OF THE CATWALK BROKE OFF AND LANDED ON EE'S FOOT.

2000 · 1 incident

September 8, 2000 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion (Not Elsewhere Classified)

EE TRIED TO MOVE A 24" PIPE ALON

1998 · 2 incidents

June 18, 1998 CA · Metal/Non-Metal ledgeman/hand, quarry man HANDTOOLS (NONPOWERED)
Hi-Grade Materials Co · Caught in, under or between a moving and a stationary object

PULLING CABLE IT GOT STUCK IN SPINDLE OF WINCH GRIP CAME OFF HANDLE OF WINCH EE FELL BACK-CAUGHT HAND BETWEEN DOOR OF TRUCK AND SELF.

April 2, 1998 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Fall to the walkway or working surface

WORKING WITH LOADER. STEPPED OUT OF EXIT DOOR. EARTH WAS LOOSE AND GAVE WAY CAUSING BODY TO THRUST TO EE'S LEFT SIDE AND FALL DOWN. RIGHT LEG WAS CAUGHT IN DIRT.

1996 · 1 incident

November 20, 1996 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator MACHINERY
Hi-Grade Materials Co · Flash burns (welding)

CUTTING METAL OUT OF CONE CRUSHER. WHILE USING WELDER, GOT A FLASH BURN TO EYES.

1994 · 1 incident

May 26, 1994 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Fall from machine

EMPLOYEE WAS STANDING ON THE FRAME OF THE JAW CRUSHER ASSISTING WITH THE INSTALLATION, LOST HIS FOOTING, SLIPPED AND FELL TO THE GROUND, APPROX. 10 FT.

1991 · 1 incident

October 12, 1991 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Fall onto or against objects

WORKING INCLINED SHAKER SLIPPED TRYING TO CATCH FROM FALLING R FOREARM CUT WITH KNIFE

1990 · 1 incident

February 12, 1990 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion in lifting objects

EMPLOYEE ATTEMPTED TO LIFT A 8INX6FT CHANNEL (I BEAM) WHEN HE PULLED THE MUSCLES IN HIS STOMACH & HIS TESTES

1988 · 3 incidents

September 2, 1988 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
Hi-Grade Materials Co · Struck against a moving object

EMPLOYEE REPRTED THAT AT APPROX 4 PM WHILE OPERATING A LOADER HE HIT A HOLE AND HURT HIS BACK.

August 16, 1988 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hi-Grade Materials Co · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS ON TOP OF THE WET SCREEN PLANT WELDING EMPLOYEE WAS DISENGAGING A WELDING CABLE WHEN THE CABLE SUDDENLY WHIPPED AROUND THE TOP RAIL CATCHING HIS LEFT THUMB

January 25, 1988 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator MACHINERY
Hi-Grade Materials Co · Contact with hot objects or substances

WHILE EMPLOYEE 4AS USING THE CUTTING TORCH ON A SECTION OF THE JAW CRUSHER A LARGE SPARK AND /OR A PIECE OF METAL BURNED A HOLE IN THE OXYFEN HOSE IT RUPTURED APPROX 1 INCH BAKC FROM THE TORCH HANDLE 3

1987 · 2 incidents

October 22, 1987 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Hi-Grade Materials Co · Fall from machine

EMPLOYEE WAS AT7EMPTING TO TIGHTEN JAW ON JAW CRUSHER EMPLOYEE STEPPED DOWN FROM MAIN FRAME OF PORTABLE CRUSHER ONTO TAILGATE OF A CO.VEHICLE TAILGATE SUDDENLY OPENED EMPLOYEE LOST BALANCE & RT.HAND(R-RING)3FINGER MADE CONTACT WITH FLY WHEEL DRIVE

August 8, 1987 CA · Metal/Non-Metal outside foreman, leadman HANDLING OF MATERIALS
Hi-Grade Materials Co · Over-exertion (Not Elsewhere Classified)

EMPLOYEE WAS CL3MBING A LADDER WITH A 50 LB. PIECE OF STEEL ON HIS SHOULDER. AS THE EMPLOYEE WAS ASCENDING THE LADDER HE TWISTED HIS RIGHT KNEE.

For insurers, brokers, and safety consultants

The full compliance file on Littlerock 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.