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TRP Table Mountain Plant: 65 MSHA citations Metal/Non-Metal

Controlled by Vulcan Materials Company
colusa, Butte County, CA  ·  Active
MSHA Mine ID: 0404847

TRP Table Mountain Plant has $9K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
17
Years on record
1987–2019
Latest incident
Oct 2019
Compliance record
MSHA citations since 2000
65
citations
15
significant & substantial
$8,691
proposed penalties
$8,641
paid to date
99% of proposed penalties paid to date, a $50 gap.
Source: MSHA violations data, updated weekly.
See Triangle Rock Products's full MSHA compliance history →
Inspection activity
MSHA inspections since 2000
67
inspections on record
927
inspection hours
n/a
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.
Rate withheld: 927 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

TRP Table Mountain Plant has $9K in proposed MSHA penalties and $0 outstanding across 1 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.
$9K
proposed penalties
$9K
current assessed
$9K
paid to date
$0
outstanding
65 assessments are final orders; 1 contested dockets.
Of $725 in penalties contested before the Commission, $675 was upheld in final decisions.
As of the most recent assessment on 2025-10-15.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Violation severity profile
ⓘ Shares are computed over citations that carry the MSHA gravity and negligence coding; a small share of records are uncoded.
23.1%
significant & substantial
0.0%
high negligence or reckless
23.1%
reasonably likely or greater
52.3%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 26.2% low, 73.8% moderate, 0.0% high, 0.0% reckless.
Source: MSHA violations gravity and negligence coding, updated weekly.
When citations were contested
ⓘ 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.
4 citations taken to the federal commission · 6% of citations on record
  • Settled 4 · 100%
7%
Penalty reduction in decided contests
$725 proposed, $675 after decisions · industry: 39%
Source: MSHA Contested Violations file (public record), updated weekly. A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record. Latest contest filed 2012-12-04.
Contested penalties
ⓘ 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.
Largest penalties this mine contested before the Federal Mine Safety and Health Review Commission, with the outcome on record.
Docket Decision Judge Year Proposed / upheld
WEST 2013-258M Settlement Manning 2013 $725 → $675
Source: FMSHRC civil penalty dockets and decisions (public record), updated weekly.
Health sampling
ⓘ 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: 2025-09-03
0%
of limit-tested samples over the exposure limit
19
samples
4
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg9
  • Unlisted Particulate, respirable, <1% Qtz6
  • Quartz, respirable, >1% Qtz4
Show the individual readings (19)
Date Contaminant Concentration Limit Conc / limit Occupation
2025-09-03 Respirable dust, <.1mg 0 Supervisor, Co. Official
2023-10-31 Respirable dust, <.1mg 0 Mechanic
2023-08-24 Respirable dust, <.1mg 0 Mechanic
2022-10-18 Respirable dust, <.1mg 0 Front-end Loader Operator
2016-04-06 Respirable dust, <.1mg 0 Mechanic
2016-04-06 Respirable dust, <.1mg 0 Lab Technician
2016-04-06 Respirable dust, <.1mg 0 Mechanic
2013-09-12 Quartz, respirable, >1% Qtz 0.35 2.08 0.17 Front-end Loader Operator
2013-09-12 Unlisted Particulate, respirable, <1% Qtz 0.43 Crusher Oper/Worker
2013-09-12 Respirable dust, <.1mg 0 Laborer, Bullgang
2009-02-18 Unlisted Particulate, respirable, <1% Qtz 0.48 Cleanup Man
2008-04-16 Quartz, respirable, >1% Qtz 0.51 1.72 0.30 Cleanup Man
2008-04-16 Unlisted Particulate, respirable, <1% Qtz 0.81 Cleanup Man
2008-04-16 Unlisted Particulate, respirable, <1% Qtz 0.2 Dry Screen Plant Operator
2002-11-13 Quartz, respirable, >1% Qtz 0.31 2.31 0.13 Bulldozer Operator
2002-11-13 Respirable dust, <.1mg 0 Welder, etc.
2002-11-13 Unlisted Particulate, respirable, <1% Qtz 1.59 Welder, etc.
2002-11-13 Quartz, respirable, >1% Qtz 0.2 1.64 0.12 Laborer, Bullgang
2002-11-13 Unlisted Particulate, respirable, <1% Qtz 0.24 Laborer, Bullgang
Source: MSHA respirable dust, quartz, and noise sampling records, updated weekly. Metal/nonmetal contaminant figures come from MSHA's Personal Health Samples and Area Samples files (public record), updated weekly.

TRP Table Mountain Plant recorded 0.00 reportable injury cases per 100 full-time workers in 2025.

Injury rate, 2025
ⓘ 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.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
Below average. The US metal and nonmetal mining average was 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In California, metal and nonmetal mining averaged 1.42 cases per 100 workers that year.
Under 100,000 employee-hours were reported that year, so a single case moves the rate by two or more. Read the figure as approximate.
Year total case rate days-away fatal
2025 * 0.00 0.00 0.000
2024 * 0.00 0.00 0.000
2023 * 0.00 0.00 0.000
2022 * 0.00 0.00 0.000
2021 * 0.00 0.00 0.000
2020 * 0.00 0.00 0.000
2019 * 6.20 6.20 0.000
2018 * 0.00 0.00 0.000
* Fewer than 100,000 employee-hours that year; the rate is less stable.
Source: injury cases from MSHA accident and injury records; employee-hours from MSHA quarterly employment reports. Rate is cases per 100 full-time-equivalent workers, operator employees only.
Ownership history
  1. Green Rock Quarries 1986 to 1996
  2. Meridian Aggregates Company 1996 to 2001
  3. Meridian Aggregates Company Lp 2001 to 2005
  4. Martin Marietta Materials 2005 to 2008
  5. Triangle Rock Products 2008 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 16
2025 17
2024 16
2023 15
2022 15
2021 16
2020 16
2019 17
2018 19
2017 18
2016 16
2015 17
2014 18
2013 16
2012 14
2011 14
2010 14
2009 16
2008 13
2007 13
2006 13
2005 14
2004 15
2003 15
2002 23
2001 23
2000 17
Source: MSHA quarterly employment and production, updated weekly.

TRP Table Mountain Plant sits in Butte County, California, where the Census mining category is 0.1% of county employment.

Local economic context
ⓘ 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.
Butte County, California · Population 209,470
0.1%
Mining share of county employment
$68,574
Median household income
Source: US Census Bureau, American Community Survey 2023 5-year estimates.
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
2026 Q2 7,782 0 0 0.0
2026 Q1 7,699 0 0 0.0
2025 Q4 7,522 1 0 132.9
2025 Q3 8,273 0 0 0.0
2025 Q2 7,838 0 0 0.0
2025 Q1 7,425 0 0 0.0
2024 Q4 7,123 0 0 0.0
2024 Q3 7,087 0 0 0.0
Show 98 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 7,420 0 0 0.0
2024 Q1 8,117 0 0 0.0
2023 Q4 7,572 0 0 0.0
2023 Q3 7,974 0 0 0.0
2023 Q2 7,077 0 0 0.0
2023 Q1 6,770 0 0 0.0
2022 Q4 6,510 0 0 0.0
2022 Q3 7,639 1 1 130.9
2022 Q2 7,614 0 0 0.0
2022 Q1 7,098 0 0 0.0
2021 Q4 7,052 0 0 0.0
2021 Q3 8,029 0 0 0.0
2021 Q2 7,470 0 0 0.0
2021 Q1 8,401 0 0 0.0
2020 Q4 7,270 0 0 0.0
2020 Q3 6,726 0 0 0.0
2020 Q2 7,081 0 0 0.0
2020 Q1 8,563 0 0 0.0
2019 Q4 8,143 0 0 0.0
2019 Q3 8,443 0 0 0.0
2019 Q2 7,675 0 0 0.0
2019 Q1 8,002 0 0 0.0
2018 Q4 8,147 0 0 0.0
2018 Q3 8,614 0 0 0.0
2018 Q2 7,961 0 0 0.0
2018 Q1 9,467 0 0 0.0
2017 Q4 8,298 0 0 0.0
2017 Q3 9,646 0 0 0.0
2017 Q2 9,082 0 0 0.0
2017 Q1 9,821 3 0 305.5
2016 Q4 7,733 0 0 0.0
2016 Q3 9,072 0 0 0.0
2016 Q2 7,864 2 1 254.3
2016 Q1 8,804 0 0 0.0
2015 Q4 7,897 0 0 0.0
2015 Q3 9,026 0 0 0.0
2015 Q2 9,179 0 0 0.0
2015 Q1 10,147 0 0 0.0
2014 Q4 9,474 2 0 211.1
2014 Q3 10,276 0 0 0.0
2014 Q2 9,433 0 0 0.0
2014 Q1 9,259 2 1 216.0
2013 Q4 9,201 0 0 0.0
2013 Q3 9,813 0 0 0.0
2013 Q2 9,196 1 1 108.7
2013 Q1 8,831 0 0 0.0
2012 Q4 8,665 6 0 692.4
2012 Q3 7,666 0 0 0.0
2012 Q2 7,324 0 0 0.0
2012 Q1 8,743 1 0 114.4
2011 Q4 8,589 0 0 0.0
2011 Q3 7,915 0 0 0.0
2011 Q2 7,042 0 0 0.0
2011 Q1 6,883 3 1 435.9
2010 Q4 6,592 0 0 0.0
2010 Q3 6,878 0 0 0.0
2010 Q2 8,308 4 0 481.5
2010 Q1 7,951 2 0 251.5
2009 Q4 8,052 0 0 0.0
2009 Q3 8,776 0 0 0.0
2009 Q2 8,812 0 0 0.0
2009 Q1 11,624 0 0 0.0
2008 Q4 10,132 1 0 98.7
2008 Q3 9,893 0 0 0.0
2008 Q2 7,997 2 1 250.1
2008 Q1 9,379 2 1 213.2
2007 Q4 7,616 0 0 0.0
2007 Q3 8,675 0 0 0.0
2007 Q2 9,232 0 0 0.0
2007 Q1 9,451 0 0 0.0
2006 Q4 8,485 2 0 235.7
2006 Q3 8,027 0 0 0.0
2006 Q2 9,821 3 0 305.5
2006 Q1 7,381 0 0 0.0
2005 Q4 8,719 1 0 114.7
2005 Q3 9,255 0 0 0.0
2005 Q2 8,799 0 0 0.0
2005 Q1 8,906 0 0 0.0
2004 Q4 9,926 1 0 100.7
2004 Q3 9,080 0 0 0.0
2004 Q2 9,497 3 1 315.9
2004 Q1 10,927 0 0 0.0
2003 Q4 7,886 3 1 380.4
2003 Q3 8,141 0 0 0.0
2003 Q2 9,180 0 0 0.0
2003 Q1 11,521 0 0 0.0
2002 Q4 9,527 1 0 105.0
2002 Q3 10,819 0 0 0.0
2002 Q2 12,511 0 0 0.0
2002 Q1 11,954 3 2 251.0
2001 Q4 20,863 0 0 0.0
2001 Q3 10,327 6 2 581.0
2001 Q2 10,428 0 0 0.0
2001 Q1 10,283 0 0 0.0
2000 Q4 7,822 0 0 0.0
2000 Q3 9,194 3 0 326.3
2000 Q2 8,607 0 0 0.0
2000 Q1 9,096 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

17 on file

2019 · 1 incident

October 8, 2019 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Triangle Rock Products · Fall from machine

On 10/8/19, the employee was descending excavator when EE's left knee buckled and EE fell to the ground. The employee was treated at the Company clinic where EE was diagnosed with a left knee sprain and a right shoulder strain, placed on restricted duty, and prescribed physical therapy

2017 · 1 incident

October 8, 2017 CA · Metal/Non-Metal FIRE
Triangle Rock Products · Accident type, without injuries

A wild fire blew through the mine. The fire started off site and because of strong winds quickly engulfed areas such as the bone yard and timber by the rail. There were a few plant supplies and 80 plus ties lost due to the fire.

2007 · 1 incident

July 20, 2007 CA · Metal/Non-Metal drill operator MACHINERY
Martin Marietta Materials · Caught in, under or between running or meshing objects

The chain on drill mast was broken (it was wedged into the top sprocket). When pried loose it pulled his glove into the chain and the sprocket, pinching his right hand, thus requiring 17 stitches.

2006 · 1 incident

June 15, 2006 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
Martin Marietta Materials · Struck by... (Not Elsewhere Classified)

replacing a tension rod on jaw crusher. He was on the under belt with restricted mobility. While tightening the bolt with an impact wrench and backing up the nut with a box end wrench, his hand slipped off back up wrench. The impact was still engaged and spun the box end wrench striking him just below the lower lip.

2003 · 2 incidents

September 30, 2003 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Meridian Aggregates Company Lp · Struck by... (Not Elsewhere Classified)

GRINDING ON LOADER BUCKET. WAS WEARING SAFETY GLASSES AND FACE SHIELD. FLIPPED UP FACE SHIELD AFTER STOPPED GRINDING AND DEBRIS FELL IN EYE.

March 19, 2003 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Meridian Aggregates Company Lp · Over-exertion (Not Elsewhere Classified)

KNOCKING ROCK OUT OF A TAIL PULLEY, NOT ENOUGH ROOM TO KEEP BODY IN COMFORTABLE WORKING CONDITION.

2002 · 2 incidents

June 14, 2002 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
Meridian Aggregates Company Lp · Fall onto or against objects

EE WAS WORKING ON CHUTE, WHILE CLIMBING DOWN, HECAUGHT HIS SLEEVE OF HIS OVERALLS ON THE CHUTE, CAUSING HIM TO SPIN AROUND HITTING HIS RIBS.

2000 · 1 incident

May 18, 2000 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Meridian Aggregates Company · Struck by... (Not Elsewhere Classified)

CUTTING BELTING MATERIAL W/RAZOR KNIFE--KNIFE SLIPPED, CUTTING EMPLOYEE ON RIGHT THIGH.

1997 · 2 incidents

December 15, 1997 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Meridian Aggregates Company · Over-exertion (Not Elsewhere Classified)

SLIPPED OFF TRACKS OF D-10 GRABBLED FOR HANDRAIL AND PULLED R SHOULDER MUSCLE.

April 23, 1997 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
Meridian Aggregates Company · Contact with hot objects or substances

CLEANING EQUIPMENT WITH PRESSURE WASHED, WATER CAME BACK BURNING L. FOOT. SECOND DEGREE BURN TO L FOOT AND 4TH & 5TH TOES.

1996 · 1 incident

October 21, 1996 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
Meridian Aggregates Company · Flash burns (welding)

WELDING WITH A MASK AND RECEIVED FLASH BURNS.

1994 · 3 incidents

August 8, 1994 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Green Rock Quarries · Over-exertion (Not Elsewhere Classified)

LEFT FOOT GOT COMPRESSED UPWARDS BETWEEN RAILROAD TIE AND SCALE BACKHOE OPERATOR WAS STARTING TO NUDGE TIE INTO POSITION WHEN JASON MOVED LEFT FOOT TO REPOSITION IT. TIE PUSHED HIS HOOT IN TO WARD SCALE BENDING IT BACK UPWARDS TOWARD JASON.

February 6, 1994 CA · Metal/Non-Metal OTHER
Green Rock Quarries · Over-exertion (Not Elsewhere Classified)

FIRE CURRENTLY UNDER INVESTIGATION. FIRE STARTED FROM SMALL ELECTRICAL HEATER.

February 6, 1994 CA · Metal/Non-Metal security guard, watchman OTHER
Green Rock Quarries · (Not Elsewhere Classified)

FIRE CURRENTLY UNDER INVESTIGATION. UNKNOWN AT THIS TIME.

1992 · 1 incident

September 22, 1992 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL
Green Rock Quarries · Caught in, under or between collapsing material or buildings

SMELLED HYDROLIC OIL,STOPPED TO SEE IF HOSE HAD BROKEN WHEN RIGHT WALL CAME DOWN ON HIM,PARTIALLY COVERING HIM WITH ROCK AND INJURING LOWER BACK.

1987 · 1 incident

August 5, 1987 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman OTHER
Green Rock Quarries · Struck by flying object

GUST OF WIND BL9W DUST IN EYE