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.
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.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
1
Section 107(a) orders
Most recent order: 2023-06-06.
On record since 2023.
Source: MSHA imminent-danger order records, 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.
Of $20K in penalties contested before the Commission, $15K was upheld in final decisions.
As of the most recent assessment on 2023-10-11.
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.
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.
11citations taken to the federal commission · 6% of citations on record
Settled
11 · 100%
80%
S&S designation survived the contest
ⓘ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.
of 5 decided S&S contests · industry: 79%
27%
Penalty reduction in decided contests
$16K proposed, $12K 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 2009-12-29.
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.
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: 2026-05-27
15
samples
0
limit-tested
Most sampled contaminants
Respirable dust, <.1mg12
Unlisted Particulate, respirable, <1% Qtz3
Show the individual readings (15)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2026-05-27
Respirable dust, <.1mg
0
Front-end Loader Operator
2026-05-27
Respirable dust, <.1mg
0
Track Man/Gang
2023-10-11
Respirable dust, <.1mg
0
Laborer, Bullgang
2022-11-02
Respirable dust, <.1mg
0
Laborer, Bullgang
2022-11-02
Respirable dust, <.1mg
0
Laborer, Bullgang
2022-03-23
Respirable dust, <.1mg
0
Front-end Loader Operator
2022-03-23
Respirable dust, <.1mg
0
Cleanup Man
2020-12-08
Respirable dust, <.1mg
0
Front-end Loader Operator
2018-01-10
Respirable dust, <.1mg
0
Mechanic
2018-01-10
Respirable dust, <.1mg
0
Crusher Oper/Worker
2013-02-14
Respirable dust, <.1mg
0
Laborer, Bullgang
2013-02-14
Respirable dust, <.1mg
0
Front-end Loader Operator
2013-02-14
Unlisted Particulate, respirable, <1% Qtz
0.14
Mechanic
2007-08-02
Unlisted Particulate, respirable, <1% Qtz
0.15
Front-end Loader Operator
2007-08-02
Unlisted Particulate, respirable, <1% Qtz
0.47
Front-end Loader Operator
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.
Glass Mountain Pumice recorded 0.00 reportable injury cases per 100 full-time workers in 2018.
Injury rate, 2018
ⓘ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 1.95 and the all-US-mining average was 2.33 cases per 100 workers.
In California, metal and nonmetal mining averaged 1.92 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
2018 *
0.00
0.00
0.000
2008 *
0.00
0.00
0.000
2007 *
0.00
0.00
0.000
2004 *
0.00
0.00
0.000
2000 *
6.73
6.73
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
6
2025
6
2024
6
2023
7
2022
6
2021
7
2020
7
2019
8
2018
9
2017
8
2016
6
2015
7
2014
7
2013
9
2012
8
2011
7
2010
7
2009
13
2008
12
2007
12
2006
10
2005
10
2004
14
2003
16
2002
11
2001
12
2000
16
Source: MSHA quarterly employment and production, updated weekly.
Glass Mountain Pumice sits in Modoc County, California, where the Census mining category is 0.0% 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.
Modoc County, California · Population 8,646
0.0%
Mining share of county employment
$56,648
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
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, 2013CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP 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, 2013CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
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, 2012CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
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, 2011CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerOTHER
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.
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.
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