The employee had just finished the post-trip inspection of equipment they operated at the Santa Margarita Quarry. The employee wanted to check out the new frontend loader, so they started to walk around the and look at the new equipment. The new loader was backed into a cutout to prevent the equipment from moving and the employee stepped into the cutout and slipped and fell.
Santa Margarita Aggregates: 163 MSHA citations Metal/Non-Metal
Santa Margarita Aggregates has $104K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.
Watch this mine
Email me when a new MSHA incident is filed at Santa Margarita Aggregates.
- Fatalities
- 0
- Total incidents
- 24
- Years on record
- 1986–2022
- Latest incident
- Aug 2022
ⓘ
This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.Santa Margarita Aggregates has $104K in proposed MSHA penalties and $0 outstanding across 1 contested dockets.
ⓘ
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.ⓘ
Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.ⓘ
Contesting a citation before the Federal Mine Safety and Health Review Commission is a lawful right. These figures state the public outcomes of that process, from MSHA's Contested Violations file.- Settled 3 · 75%
- Vacated or withdrawn 1 · 25%
ⓘ
Counts a Significant & Substantial citation as surviving when a settlement or judge's decision kept the designation, or the contest was dismissed or defaulted so the citation stands as issued. Vacated and withdrawn citations, and settlements that removed the designation, count against.ⓘ
A reduction or dismissal at the Commission is a lawful outcome of contesting a proposed penalty. Figures are the proposed amount and the amount upheld in the docket's decision.| Docket | Decision | Judge | Year | Proposed / upheld |
|---|---|---|---|---|
| WEST 2010-808M | Settlement | Gill | 2011 | $934 → $485 |
ⓘ
A sample is a point in time compliance measurement, not an individual exposure history. These figures describe MSHA sampling records and do not establish causation or personal dose.Metal and nonmetal contaminants (personal samples)
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.
Last sampled: 2026-04-27
ⓘ
Many samples are screening measurements of substances with no applicable exposure limit; they are counted as samples but excluded from every over-limit figure. Over-limit shares use only limit-tested samples.- Quartz, respirable, >1% Qtz13
- Respirable dust, <.1mg8
Show the individual readings (21)
| Date | Contaminant | Concentration | Limit | Conc / limit | Occupation |
|---|---|---|---|---|---|
| 2026-04-27 | Respirable dust, <.1mg | 0 | Laborer, Bullgang | ||
| 2022-11-30 | Quartz, respirable, >1% Qtz | 0.15 | Laborer, Bullgang | ||
| 2022-11-30 | Quartz, respirable, >1% Qtz | 0.53 | 0.57 | 0.93 | Laborer, Bullgang |
| 2022-05-04 | Quartz, respirable, >1% Qtz | 0.17 | 0.47 | 0.36 | Crusher Oper/Worker |
| 2019-02-04 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2015-10-20 | Respirable dust, <.1mg | 0 | Crusher Oper/Worker | ||
| 2015-10-20 | Quartz, respirable, >1% Qtz | 0.43 | 1.22 | 0.35 | Washer Operator |
| 2015-10-20 | Quartz, respirable, >1% Qtz | 0.14 | 0.69 | 0.20 | Truck Driver |
| 2015-10-20 | Quartz, respirable, >1% Qtz | 0.12 | 1.02 | 0.12 | Dry Screen Plant Operator |
| 2015-10-20 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2009-05-13 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2009-05-13 | Quartz, respirable, >1% Qtz | 0.17 | 0.62 | 0.27 | Truck Driver |
| 2009-05-13 | Respirable dust, <.1mg | 0 | Front-end Loader Operator | ||
| 2009-05-13 | Quartz, respirable, >1% Qtz | 0.3 | 0.75 | 0.40 | Washer Operator |
| 2005-04-20 | Quartz, respirable, >1% Qtz | 0.23 | 0.47 | 0.49 | Front-end Loader Operator |
| 2005-04-20 | Respirable dust, <.1mg | 0 | Truck Driver | ||
| 2005-04-20 | Quartz, respirable, >1% Qtz | 0.38 | 0.75 | 0.51 | Truck Driver |
| 2005-04-20 | Respirable dust, <.1mg | 0 | Washer Operator | ||
| 2004-01-28 | Quartz, respirable, >1% Qtz | 0.16 | 0.84 | 0.19 | Crusher Oper/Worker |
| 2004-01-28 | Quartz, respirable, >1% Qtz | 0.24 | 0.85 | 0.28 | Oiler, Greaser |
| 2004-01-28 | Quartz, respirable, >1% Qtz | 0.23 | 1.62 | 0.14 | Crusher Oper/Worker |
Santa Margarita Aggregates recorded 6.78 reportable injury cases per 100 full-time workers in 2022.
ⓘ
This rate is reportable injury cases per 100 full-time-equivalent workers per year, computed as 200,000 times cases divided by MSHA operator-reported employee-hours. Cases are injuries MSHA graded degree 01 through 07; accident-only events that hurt no one are excluded, and so are contractor injuries, whose hours do not attach to a single mine. Rates begin in 2000, when quarterly employment reporting starts, and are withheld below 20,000 hours in a year.| Year | total case rate | days-away | fatal |
|---|---|---|---|
| 2022 * | 6.78 | 0.00 | 0.000 |
| 2021 * | 5.43 | 5.43 | 0.000 |
| 2020 * | 0.00 | 0.00 | 0.000 |
| 2019 * | 0.00 | 0.00 | 0.000 |
| 2018 * | 0.00 | 0.00 | 0.000 |
| 2017 * | 7.81 | 0.00 | 0.000 |
| 2016 * | 0.00 | 0.00 | 0.000 |
| 2015 * | 15.58 | 0.00 | 0.000 |
- Kaiser Sand & Gravel Company 1978 to 1988
- Hanson Aggregates West Inc 1988 to 2006
- Martin Marietta Northern California Aggregates,LLC 2006 to present
| Year | Employees |
|---|---|
| 2026 | 10 |
| 2025 | 9 |
| 2024 | 8 |
| 2023 | 6 |
| 2022 | 12 |
| 2021 | 18 |
| 2020 | 14 |
| 2019 | 13 |
| 2018 | 14 |
| 2017 | 13 |
| 2016 | 15 |
| 2015 | 14 |
| 2014 | 16 |
| 2013 | 14 |
| 2012 | 13 |
| 2011 | 15 |
| 2010 | 15 |
| 2009 | 17 |
| 2008 | 15 |
| 2007 | 14 |
| 2006 | 14 |
| 2005 | 15 |
| 2004 | 16 |
| 2003 | 15 |
| 2002 | 16 |
| 2001 | 15 |
| 2000 | 17 |
Santa Margarita Aggregates sits in San Luis Obispo County, California, where the Census mining category is 0.2% of county employment.
ⓘ
County figures come from the US Census Bureau's American Community Survey, 5-year pooled estimates, so the 2023 vintage covers 2019 through 2023. The Census category is 'mining, quarrying, and oil and gas extraction', which is broader than MSHA jurisdiction and includes oil and gas workers no mine employs. These figures describe the surrounding county, not this mine, and are not a factor in any specific incident.ⓘ
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.| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2026 Q2 | 5,212 | 1 | 0 | 191.9 |
| 2026 Q1 | 6,171 | 1 | 0 | 162.0 |
| 2025 Q4 | 5,113 | 0 | 0 | 0.0 |
| 2025 Q3 | 3,916 | 2 | 0 | 510.7 |
| 2025 Q2 | 4,544 | 0 | 0 | 0.0 |
| 2025 Q1 | 4,460 | 0 | 0 | 0.0 |
| 2024 Q4 | 4,339 | 0 | 0 | 0.0 |
| 2024 Q3 | 4,597 | 0 | 0 | 0.0 |
Show 97 earlier quarters Hide earlier quarters
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2024 Q2 | 4,656 | 0 | 0 | 0.0 |
| 2024 Q1 | 4,961 | 2 | 1 | 403.1 |
| 2023 Q4 | 5,134 | 0 | 0 | 0.0 |
| 2023 Q3 | 2,838 | 0 | 0 | 0.0 |
| 2023 Q2 | 642 | 0 | 0 | 0.0 |
| 2023 Q1 | 3,808 | 0 | 0 | 0.0 |
| 2022 Q4 | 7,421 | 3 | 0 | 404.3 |
| 2022 Q3 | 7,136 | 0 | 0 | 0.0 |
| 2022 Q2 | 7,512 | 3 | 0 | 399.4 |
| 2022 Q1 | 7,447 | 5 | 3 | 671.4 |
| 2021 Q4 | 6,614 | 0 | 0 | 0.0 |
| 2021 Q3 | 13,928 | 0 | 0 | 0.0 |
| 2021 Q2 | 8,017 | 6 | 0 | 748.4 |
| 2021 Q1 | 8,279 | 7 | 0 | 845.5 |
| 2020 Q4 | 8,849 | 0 | 0 | 0.0 |
| 2020 Q3 | 7,821 | 6 | 2 | 767.2 |
| 2020 Q2 | 6,451 | 0 | 0 | 0.0 |
| 2020 Q1 | 7,500 | 8 | 6 | 1066.7 |
| 2019 Q4 | 6,860 | 0 | 0 | 0.0 |
| 2019 Q3 | 9,026 | 0 | 0 | 0.0 |
| 2019 Q2 | 6,984 | 9 | 7 | 1288.7 |
| 2019 Q1 | 6,860 | 1 | 1 | 145.8 |
| 2018 Q4 | 6,753 | 0 | 0 | 0.0 |
| 2018 Q3 | 7,808 | 0 | 0 | 0.0 |
| 2018 Q2 | 8,101 | 5 | 3 | 617.2 |
| 2018 Q1 | 6,653 | 3 | 2 | 450.9 |
| 2017 Q4 | 7,773 | 0 | 0 | 0.0 |
| 2017 Q3 | 6,126 | 0 | 0 | 0.0 |
| 2017 Q2 | 6,534 | 3 | 0 | 459.1 |
| 2017 Q1 | 5,182 | 3 | 1 | 578.9 |
| 2016 Q4 | 5,233 | 0 | 0 | 0.0 |
| 2016 Q3 | 6,488 | 0 | 0 | 0.0 |
| 2016 Q2 | 6,363 | 3 | 2 | 471.5 |
| 2016 Q1 | 5,625 | 0 | 0 | 0.0 |
| 2015 Q4 | 6,307 | 5 | 2 | 792.8 |
| 2015 Q3 | 5,615 | 0 | 0 | 0.0 |
| 2015 Q2 | 6,061 | 8 | 1 | 1319.9 |
| 2015 Q1 | 7,695 | 3 | 0 | 389.9 |
| 2014 Q4 | 7,648 | 0 | 0 | 0.0 |
| 2014 Q3 | 7,877 | 15 | 3 | 1904.3 |
| 2014 Q2 | 5,539 | 0 | 0 | 0.0 |
| 2014 Q1 | 6,305 | 0 | 0 | 0.0 |
| 2013 Q4 | 8,729 | 0 | 0 | 0.0 |
| 2013 Q3 | 6,775 | 0 | 0 | 0.0 |
| 2013 Q2 | 4,753 | 1 | 0 | 210.4 |
| 2013 Q1 | 5,397 | 0 | 0 | 0.0 |
| 2012 Q4 | 5,242 | 3 | 1 | 572.3 |
| 2012 Q3 | 5,763 | 0 | 0 | 0.0 |
| 2012 Q2 | 5,918 | 3 | 1 | 506.9 |
| 2012 Q1 | 6,786 | 5 | 2 | 736.8 |
| 2011 Q4 | 7,424 | 0 | 0 | 0.0 |
| 2011 Q3 | 8,107 | 1 | 1 | 123.4 |
| 2011 Q2 | 8,387 | 0 | 0 | 0.0 |
| 2011 Q1 | 7,962 | 3 | 0 | 376.8 |
| 2010 Q4 | 7,102 | 0 | 0 | 0.0 |
| 2010 Q3 | 7,716 | 1 | 1 | 129.6 |
| 2010 Q2 | 6,589 | 0 | 0 | 0.0 |
| 2010 Q1 | 5,155 | 3 | 0 | 582.0 |
| 2009 Q4 | 7,098 | 0 | 0 | 0.0 |
| 2009 Q3 | 7,806 | 0 | 0 | 0.0 |
| 2009 Q2 | 7,814 | 2 | 1 | 256.0 |
| 2009 Q1 | 8,231 | 0 | 0 | 0.0 |
| 2008 Q4 | 6,352 | 3 | 1 | 472.3 |
| 2008 Q3 | 6,375 | 0 | 0 | 0.0 |
| 2008 Q2 | 4,706 | 0 | 0 | 0.0 |
| 2008 Q1 | 6,374 | 2 | 0 | 313.8 |
| 2007 Q4 | 6,202 | 0 | 0 | 0.0 |
| 2007 Q3 | 6,183 | 0 | 0 | 0.0 |
| 2007 Q2 | 6,354 | 0 | 0 | 0.0 |
| 2007 Q1 | 6,156 | 0 | 0 | 0.0 |
| 2006 Q4 | 5,768 | 0 | 0 | 0.0 |
| 2006 Q3 | 5,901 | 2 | 0 | 338.9 |
| 2006 Q2 | 6,377 | 0 | 0 | 0.0 |
| 2006 Q1 | 6,926 | 7 | 0 | 1010.7 |
| 2005 Q4 | 5,804 | 0 | 0 | 0.0 |
| 2005 Q3 | 6,796 | 0 | 0 | 0.0 |
| 2005 Q2 | 6,050 | 0 | 0 | 0.0 |
| 2004 Q4 | 7,612 | 0 | 0 | 0.0 |
| 2004 Q3 | 6,637 | 0 | 0 | 0.0 |
| 2004 Q2 | 7,309 | 0 | 0 | 0.0 |
| 2004 Q1 | 6,761 | 3 | 0 | 443.7 |
| 2003 Q4 | 6,988 | 0 | 0 | 0.0 |
| 2003 Q3 | 7,335 | 1 | 0 | 136.3 |
| 2003 Q2 | 6,591 | 0 | 0 | 0.0 |
| 2003 Q1 | 6,631 | 3 | 0 | 452.4 |
| 2002 Q4 | 8,022 | 0 | 0 | 0.0 |
| 2002 Q3 | 7,776 | 3 | 0 | 385.8 |
| 2002 Q2 | 6,764 | 1 | 0 | 147.8 |
| 2002 Q1 | 7,075 | 0 | 0 | 0.0 |
| 2001 Q4 | 7,130 | 0 | 0 | 0.0 |
| 2001 Q3 | 5,972 | 4 | 0 | 669.8 |
| 2001 Q2 | 7,481 | 0 | 0 | 0.0 |
| 2001 Q1 | 6,467 | 3 | 0 | 463.9 |
| 2000 Q4 | 6,360 | 0 | 0 | 0.0 |
| 2000 Q3 | 8,040 | 0 | 0 | 0.0 |
| 2000 Q2 | 7,198 | 0 | 0 | 0.0 |
| 2000 Q1 | 7,530 | 0 | 0 | 0.0 |
Reportable incidents
24 on file2022 · 1 incident
2021 · 1 incident
Employee was cutting metal with a torch which was supported on sawhorses. The employee moved one sawhorse and continued to use the torch to cut the metal. The employee turned to make a step and tripped over the sawhorse that they had moved earlier. The employee fell and landed on their right shoulder.
2017 · 1 incident
Miner/employee was drilling a piece of angle iron in the area of the Feed tunnel belt area when the hand drill being used twisted in their right hand resulting in a sprain to their right ring finger. Miner/employee did not report or seek medical attention until 07/12/2017.
2015 · 2 incidents
Employee received an open fracture on the tip of his left index finger while placing the main shaft sleeve on the crusher. His finger was caught between the main shaft sleeve and the mantle of the crusher when the lifting eye was removed before the sleeve was set in place and employee had not removed his finger. He required 3 stitches on the tip of his finger.
Employee and co-worker were moving steel bars onto the fork of a telelift. One bar slipped catching the employee's glove on a piece of broken weld causing his left thumb to be caught between 2 bars. Employee sustained a deep cut and a bone chipped in his left requiring 5 stitches, splint and medication.
2013 · 2 incidents
Haul truck driver was dumping a load of rock at the stockpile. His telescopic hydraulic ram on the dump bed broke off at the 3rd stage causing the bed to slam down on the frame of truck, shaking driver giving him strained neck and shoulder muscles.
We are denying this claim. EE was on medical leave for COPD and he filed for Cal State Disability after his doctor told him his illness was not work related. After 2 months of not receiving any money from the State of California, he was told the claims are backed up. This is when he filed workman's compensation claim.
2010 · 1 incident
While filling his water truck in the quarry, a bee stung the injured employee in the back of the neck.
2008 · 2 incidents
Agg Plant Repairman was using a pry bar when tool flipped up hitting employee in forehead resulting in a laceration.
Plant Operator was swinging a sledgehammer at a piece of metal when he experienced a back strain.
2007 · 1 incident
While cleaning out the dust from inside an air conditioning air vent deflector without turning the equipment off, the employee's finger was cut by a rotating blade.
2005 · 2 incidents
While tightening a bolt on a jaw crusher, the employee felt a twinge to his back.
Employee was being loaded. Loader backed up before bucket was clear. Truck leaned back then released, rocking it sideways causing injury to employee's back.
2004 · 1 incident
EMPLOYEE COMPLAINED OF BACK PAIN WHILE OPERATING #5114 LOADER.
1995 · 1 incident
EE WAS DRESSING UP GEAR WITH DIE GRINDER WITH A THIN DISC ON GRINDER. WHILE HE WAS USING GRINDER AT FULL RPM, DISC EXPLODED AND CUT INTO HIS ARM.
1993 · 1 incident
EMPLOYEE WAS REMOVING CAST IRON WEAR PLATE THAT WAS WORN OUT PRYING UP WITH A SCREWDRIVER WHEN THE PLATE BROKE LOOSE & A SHARP EDGE OF WEAR PLATE LACERATED HIS FINGER.
1990 · 1 incident
EMPLOYEE WAS CARRYING HAMMER TO DRILL AND DROPPED ON HIS LEFT FOOT.
1989 · 3 incidents
EMPLOYEE WAS DISASSEMBLING SPRING LOADED BRAKE POD SHOT OFF AND HIT WATER TRUCK AND RICOCHETED OFF OF WATER TRUC AND HIT EMPLOYEE IN FACE.
EMPLOYEE WAS WALKING TO THE SUBBASE PLANT AND FELL ONTO A SHARP ROCK. THE ROCK CUT INTO HIS RIGHT KNEE.
EMPLOYEE WAS CLEANING DIR OFF RAIL OF FEEDER ROLLER WHILE MACHINE WAS OPERATING. INDEX FINGER SMASHED MIDDLE FINGER CUT OFF BEHIND NAIL.
1988 · 2 incidents
POUNDING PIECE OF STEEL INTO GROUND HE MISSED WITH HAMMER AND HIT IT HIS KNUCKLE OF RIGHT INDEX FINGER.
RECEIVED GLANCING BLOW FROM SLEDGE HAMMER THAT GLANCEOFF OF BAR
1987 · 1 incident
WAS WASHING DOW3 THE LOADOUT AREA USING A LARGER HOSE.AS HE STEPPED BACKWARDS,HE STEPPED INTO THE PATH OF A QUARRY TRUCK AS IT LEFT THE LOADOUT AREA.
1986 · 1 incident
WEATHER WAS DAR5 AND FOGGY I NAME WAS BACKING A CAT TRUCK ON SAND STOCKPILE HE WAS TOO CLOSE TO EDGE ON HIS RT SIDE. BANK CAVED OFF AND TRUCK ROLLED OVER. I NAME HAD BUMPS AND BRUISES ALSO TORN CARTILAGE 3N RIGHT KNEE