Mining Incidents

Glass Mountain Pumice Metal/Non-Metal

Controlled by Quikrete Holdings Inc.
Glass Mountain, Modoc County, CA  ·  Active
MSHA Mine ID: 0404165

Glass Mountain Pumice has $63K in proposed MSHA penalties and $724 outstanding across 3 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
6
Years on record
2000–2016
Latest incident
Dec 2016
Compliance record
MSHA citations since 2000
196
citations
60
significant & substantial
$63,319
proposed penalties
$57,929
paid to date
91% of proposed penalties paid to date, a $5,390 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
54
inspections on record
1,231
inspection hours
15.9
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.
196 citations across 1,231 inspection hours.
Source: MSHA inspections data, updated weekly.

Glass Mountain Pumice has $63K in proposed MSHA penalties and $724 outstanding across 3 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.
$63K
proposed penalties
$59K
current assessed
$58K
paid to date
$724
outstanding
185 assessments are final orders; 3 contested dockets.
As of the most recent assessment on 2023-10-11.
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 2,542 0 0 0.0
2025 Q3 4,565 0 0 0.0
2025 Q2 3,060 0 0 0.0
2025 Q1 1,853 0 0 0.0
2024 Q4 2,750 0 0 0.0
2024 Q3 4,643 0 0 0.0
2024 Q2 3,308 0 0 0.0
2024 Q1 2,100 0 0 0.0
Show 93 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 2,954 1 0 338.5
2023 Q3 4,428 0 0 0.0
2023 Q2 3,304 3 2 908.0
2023 Q1 2,419 0 0 0.0
2022 Q4 2,848 0 0 0.0
2022 Q3 4,790 3 0 626.3
2022 Q2 3,402 0 0 0.0
2022 Q1 1,994 0 0 0.0
2021 Q4 2,590 0 0 0.0
2021 Q3 5,394 0 0 0.0
2021 Q2 3,839 0 0 0.0
2021 Q1 2,416 0 0 0.0
2020 Q4 3,264 0 0 0.0
2020 Q3 4,260 0 0 0.0
2020 Q2 3,022 0 0 0.0
2020 Q1 2,110 0 0 0.0
2019 Q4 4,092 2 0 488.8
2019 Q3 6,514 2 0 307.0
2019 Q2 5,004 0 0 0.0
2019 Q1 2,796 0 0 0.0
2018 Q4 4,145 2 0 482.5
2018 Q3 7,194 0 0 0.0
2018 Q2 6,019 3 1 498.4
2018 Q1 2,987 1 0 334.8
2017 Q4 3,328 0 0 0.0
2017 Q3 5,379 0 0 0.0
2017 Q2 5,156 0 0 0.0
2017 Q1 2,783 0 0 0.0
2016 Q4 2,814 1 0 355.4
2016 Q3 4,154 0 0 0.0
2016 Q2 3,677 3 0 815.9
2016 Q1 2,020 0 0 0.0
2015 Q4 2,362 1 0 423.4
2015 Q3 4,669 0 0 0.0
2015 Q2 2,769 3 1 1083.4
2015 Q1 2,912 2 0 686.8
2014 Q4 3,166 0 0 0.0
2014 Q3 4,938 3 0 607.5
2014 Q2 4,641 0 0 0.0
2014 Q1 2,290 2 0 873.4
2013 Q4 3,369 0 0 0.0
2013 Q3 6,003 0 0 0.0
2013 Q2 6,418 4 1 623.2
2013 Q1 4,013 6 2 1495.1
2012 Q4 3,270 0 0 0.0
2012 Q3 4,919 6 0 1219.8
2012 Q2 3,368 0 0 0.0
2012 Q1 1,986 0 0 0.0
2011 Q4 2,495 5 2 2004.0
2011 Q3 4,245 2 0 471.1
2011 Q2 3,253 10 7 3074.1
2011 Q1 2,322 0 0 0.0
2010 Q4 2,735 0 0 0.0
2010 Q3 4,000 0 0 0.0
2010 Q2 2,535 0 0 0.0
2010 Q1 2,158 0 0 0.0
2009 Q4 4,579 11 4 2402.3
2009 Q3 8,345 14 4 1677.7
2009 Q2 5,120 0 0 0.0
2008 Q4 4,800 0 0 0.0
2008 Q3 8,005 0 0 0.0
2008 Q2 5,440 5 2 919.1
2008 Q1 4,100 0 0 0.0
2007 Q4 5,610 0 0 0.0
2007 Q3 6,562 13 2 1981.1
2007 Q2 5,480 0 0 0.0
2007 Q1 4,280 0 0 0.0
2006 Q4 4,800 0 0 0.0
2006 Q3 6,240 8 2 1282.1
2006 Q2 4,646 0 0 0.0
2006 Q1 2,881 0 0 0.0
2005 Q4 3,520 2 0 568.2
2005 Q3 6,809 39 15 5727.7
2005 Q2 4,576 0 0 0.0
2005 Q1 4,243 0 0 0.0
2004 Q4 4,787 0 0 0.0
2004 Q3 9,297 0 0 0.0
2004 Q2 7,364 3 0 407.4
2004 Q1 3,251 0 0 0.0
2003 Q4 4,810 0 0 0.0
2003 Q3 8,299 8 1 964.0
2002 Q4 4,771 0 0 0.0
2002 Q3 7,834 7 0 893.5
2002 Q2 4,244 0 0 0.0
2002 Q1 2,587 0 0 0.0
2001 Q4 2,496 0 0 0.0
2001 Q3 6,507 8 5 1229.4
2001 Q2 4,904 0 0 0.0
2001 Q1 2,517 0 0 0.0
2000 Q4 5,852 0 0 0.0
2000 Q3 8,959 13 9 1451.1
2000 Q2 8,580 0 0 0.0
2000 Q1 6,326 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

6 on file

2016 · 1 incident

December 15, 2016 CA · Metal/Non-Metal car trimmer, car loader, bin puller, truck loader STEPPING OR KNEELING ON OBJECT
Monarch Mountain Minerals & Aggregates, LLC · Struck against stationary object

The EE had just positioned the rail car in place for material loading. EE locked the brakes up on the rail car and stepped down on the ground to walk back to the rail car loading station, and stepped on the south rail of the rail road track. The rail was slick from the rain and EE's foot slid off the rail sideways causing EE to roll ankle over to the side.

2013 · 2 incidents

September 10, 2013 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON

Employee was releasing brakes on rail car while standing on the rail car plat form. He tripped as he turned around and fell. He injured his left shoulder.

February 21, 2013 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Monarch Mountain Minerals & Aggregates, LLC · Over-exertion (Not Elsewhere Classified)

The employee climbed up the front of the shaker screen where there is no safe access and was cleaning excess material off of the screen chute. When he finished he was climbing down and snagged his glove on the frame of the concrete conveyor causing him to over extend his arm.

2012 · 1 incident

July 6, 2012 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Monarch Mountain Minerals & Aggregates, LLC · Fall to the walkway or working surface

I send 2 employees to clear a area of logs. I told them not to lift anything. Send 2 one to hook chain one to unhook chain Cat man was up then one of the employees lifted a branch.

2011 · 1 incident

October 7, 2011 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER
Glass Mountain Pumice 2004 LLC · Bodily reaction, (Not Elsewhere Classified)

The employee was pulling roots from the inpit feed hopper loading conveyor. He was laying on his stomach and when he stood up, he indicated he felt his knee buckle and felt a sharp pain in his right knee. X-rays of the knee were negative and employee was diagnosed with a sprained right knee, prescribed medication, and provided with some work restrictions.

2000 · 1 incident

April 18, 2000 CA · Metal/Non-Metal forklift operator EXPLODING VESSELS UNDER PRESSURE
Glass Mountain Pumice Inc · Struck by flying object

HE WAS CHANGING THE FRONT FORKLIFT TIRE. IT WAS A SPLIT WHEEL AND HE REMOVED THE WRONG HARDWARE AND THE RIM BLEW APART HITTING HIS LEFT LEG JUST ABOVE THE ANKLE.

For insurers, brokers, and safety consultants

The full compliance file on Glass Mountain Pumice

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.