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Thunder Mountain Quarry Metal/Non-Metal

Controlled by Heidelberg Materials AG
Enumclaw, King County, WA  ·  Active
MSHA Mine ID: 4501127

Thunder Mountain Quarry has $13K in proposed MSHA penalties and $0 outstanding across 2 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
10
Years on record
1995–2022
Latest incident
Jan 2022
Compliance record
MSHA citations since 2000
95
citations
20
significant & substantial
$12,602
proposed penalties
$12,468
paid to date
99% of proposed penalties paid to date, a $134 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
56
inspections on record
822
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: 822 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Thunder Mountain Quarry has $13K in proposed MSHA penalties and $0 outstanding across 2 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.
$13K
proposed penalties
$12K
current assessed
$12K
paid to date
$0
outstanding
94 assessments are final orders; 2 contested dockets.
As of the most recent assessment on 2025-10-23.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
See also the operator's enforcement record
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 1,561 1 1 640.6
2025 Q3 1,496 1 1 668.4
2025 Q2 1,527 0 0 0.0
2025 Q1 1,463 2 0 1367.1
2024 Q4 1,577 0 0 0.0
2024 Q3 1,601 0 0 0.0
2024 Q2 1,601 3 2 1873.8
2024 Q1 1,508 3 0 1989.4
Show 88 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 1,493 0 0 0.0
2023 Q3 1,457 0 0 0.0
2023 Q2 1,644 1 0 608.3
2023 Q1 1,473 0 0 0.0
2022 Q4 1,367 0 0 0.0
2022 Q3 1,740 0 0 0.0
2022 Q2 1,713 0 0 0.0
2022 Q1 1,344 7 0 5208.3
2021 Q4 1,715 0 0 0.0
2021 Q3 1,660 0 0 0.0
2021 Q2 1,208 1 1 827.8
2021 Q1 1,581 2 0 1265.0
2020 Q4 1,607 0 0 0.0
2020 Q3 1,454 2 0 1375.5
2020 Q2 1,518 0 0 0.0
2020 Q1 1,622 3 0 1849.6
2019 Q4 1,582 0 0 0.0
2019 Q3 1,630 0 0 0.0
2019 Q2 1,527 5 2 3274.4
2019 Q1 1,686 0 0 0.0
2018 Q4 1,619 2 0 1235.3
2018 Q3 1,937 0 0 0.0
2018 Q2 1,536 0 0 0.0
2018 Q1 1,491 0 0 0.0
2017 Q4 1,577 2 0 1268.2
2017 Q3 1,642 0 0 0.0
2017 Q2 1,538 0 0 0.0
2017 Q1 1,343 0 0 0.0
2016 Q4 80 0 0 0.0
2014 Q3 0 0 0
2014 Q2 40 0 0 0.0
2014 Q1 21 0 0 0.0
2013 Q4 62 0 0 0.0
2013 Q3 93 0 0 0.0
2013 Q2 1,097 1 0 911.6
2013 Q1 2,876 0 0 0.0
2012 Q4 2,806 0 0 0.0
2012 Q3 3,292 0 0 0.0
2012 Q2 815 0 0 0.0
2012 Q1 2,338 0 0 0.0
2011 Q4 2,864 0 0 0.0
2011 Q3 2,594 0 0 0.0
2011 Q2 2,543 0 0 0.0
2011 Q1 2,255 1 0 443.5
2010 Q4 2,282 0 0 0.0
2010 Q3 2,357 1 0 424.3
2010 Q2 2,328 0 0 0.0
2010 Q1 2,519 1 1 397.0
2009 Q4 2,524 0 0 0.0
2009 Q3 2,613 0 0 0.0
2009 Q2 2,180 0 0 0.0
2009 Q1 3,155 0 0 0.0
2008 Q4 3,301 0 0 0.0
2008 Q3 3,881 0 0 0.0
2008 Q2 3,804 3 2 788.6
2008 Q1 3,813 2 0 524.5
2007 Q4 3,960 0 0 0.0
2007 Q3 3,859 0 0 0.0
2007 Q2 3,804 0 0 0.0
2007 Q1 3,710 0 0 0.0
2006 Q4 4,195 2 1 476.8
2006 Q3 4,054 1 0 246.7
2006 Q2 4,020 0 0 0.0
2006 Q1 3,825 0 0 0.0
2005 Q4 3,963 0 0 0.0
2005 Q3 4,358 0 0 0.0
2005 Q2 4,068 1 0 245.8
2005 Q1 4,126 0 0 0.0
2004 Q4 3,869 2 0 516.9
2004 Q3 3,718 0 0 0.0
2004 Q2 3,691 0 0 0.0
2004 Q1 3,555 0 0 0.0
2003 Q4 3,391 4 0 1179.6
2003 Q3 3,329 0 0 0.0
2003 Q2 3,072 2 1 651.0
2003 Q1 3,196 2 1 625.8
2002 Q4 3,110 0 0 0.0
2002 Q3 3,439 1 0 290.8
2002 Q2 3,077 0 0 0.0
2002 Q1 2,818 0 0 0.0
2001 Q4 3,249 0 0 0.0
2001 Q3 3,361 3 0 892.6
2001 Q2 3,212 0 0 0.0
2001 Q1 3,037 0 0 0.0
2000 Q4 3,246 0 0 0.0
2000 Q3 2,800 0 0 0.0
2000 Q2 3,423 0 0 0.0
2000 Q1 3,083 32 7 10379.5
No fatalities recorded at this mine.

Reportable incidents

10 on file

2022 · 1 incident

January 20, 2022 WA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Cadman Inc. · Over-exertion (Not Elsewhere Classified)

After getting down from a loader, employee tripped over a rock in the mud and sustained injuries to EE's ankle.

2021 · 1 incident

April 14, 2021 WA · Metal/Non-Metal weighman, scale person OTHER
Cadman Inc. · Absorption of radiations, caustics, toxic and noxious substances

While using the porta potty restroom employee stung on the right butt cheek due to bee being on toilet seat.

2010 · 1 incident

October 4, 2010 WA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Enumclaw Quarry Inc · Struck against a moving object

EE was mining with a Kobelco excavator in a very difficult area and was jolted by impact of machine to ground contact several times a day causing pain to his right hand, arm, shoulder and neck. Did not receive paperwork from Dr until Dec 1, 2010 for L&I

2009 · 1 incident

October 20, 2009 WA · Metal/Non-Metal rotary bucket excavator operator STEPPING OR KNEELING ON OBJECT
Enumclaw Quarry Inc · Struck against stationary object

EE was dismounting excavator, stepped on a small rock and sprained his right ankle. No lost time at work. No first aid needed.

2008 · 1 incident

April 1, 2008 WA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Enumclaw Quarry Inc · Struck against a moving object

Track excavator tracked too close to edge of access ramp to working pad. Machine slid sideways 5' onto its side. Ramp and working pad with berms were over excavated. Minor injury to operator. Minimal damage to equipment.

2004 · 1 incident

July 30, 2004 WA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer MACHINERY
Enumclaw Quarry Inc · Struck by flying object

EMPLOYEE WAS EXCAVATNG ROCK WHEN A ROCK CHIP FLEW AND HIT HIS RIGHT EYE.

2000 · 1 incident

September 20, 2000 WA · Metal/Non-Metal backhoe operator, trackhoe operator, crane operator HANDLING OF MATERIALS
Enumclaw Quarry Inc · Over-exertion in lifting objects

WORKING ON GRIZZLY PLANT, CHANGING A SKIRT ON CONVEYER NELT. IN A CROUCJ POSITION, EMPLOYEE PULLED ON THE AIR HOSE AND TWISTED HIS BACK.

1998 · 1 incident

May 11, 1998 WA · Metal/Non-Metal mine manager, mine foreman, mine owner SLIP OR FALL OF PERSON
Enumclaw Quarry Inc · Fall from scaffolds, walkways, platforms

SLIPPED OFF CAT WALK IN FRONT OF OFFICE FALLING, FORWARD LANDING ON KNEES AND HANDS. TWISTED RT ANKLE, HURT LEFT KNEE STRAIN LOWER BACK AND NECK

1995 · 2 incidents

September 14, 1995 WA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator SLIP OR FALL OF PERSON
Enumclaw Quarry Inc · Fall from machine

EE WAS STANDING ON WHEEL LOADER, PULLING A BUNGEE CORD. BUNGEE HOOK STRAIGHTENED AND HE FELL 6 DOWN AND LANDED ON FOREHEAD AND WAS UNCONSCIOUS.

April 19, 1995 WA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Enumclaw Quarry Inc · Struck by flying object

INJURED WAS WORKING AT THE CRUSHER A ROCK, BOUNCED UP AND HIT THE EMPLOYEES SAFETY GLASSES, WHICH GAVE HIM A CUT ABOVE HIS RIGHT EYE.

For insurers, brokers, and safety consultants

The full compliance file on Thunder Mountain 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.

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