MAITRI CANYON PLANT has $126K in proposed MSHA penalties and $0 outstanding across 2 contested dockets, plus health sampling and the full incident record.
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Fatalities
1
Total incidents
10
Years on record
1985–2024
Latest incident
Oct 2024
Compliance record
MSHA citations since 2000
273
citations
79
significant & substantial
$126,027
proposed penalties
$120,291
paid to date
95% of proposed penalties paid to date, a $5,736 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.
273 citations across 1,716 inspection hours.
Source: MSHA inspections data, updated weekly.
MAITRI CANYON PLANT has $126K 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.
$126K
proposed penalties
$120K
current assessed
$120K
paid to date
$0
outstanding
272 assessments are final orders; 2 contested dockets.
Of $14K in penalties contested before the Commission, $8K was upheld in final decisions.
As of the most recent assessment on 2026-01-22.
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.
1citations taken to the federal commission · 0% of citations on record
Settled
1 · 100%
100%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 1 decided S&S contests · industry: 79%
70%
Penalty reduction in decided contests
$8K proposed, $2K 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 2010-07-28.
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: 2023-08-18, 3 years ago
0%
of limit-tested samples over the exposure limit
10
samples
1
limit-tested
Most sampled contaminants
Respirable dust, <.1mg9
Quartz, respirable, >1% Qtz1
Show the individual readings (10)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2023-08-18
Respirable dust, <.1mg
0
Dry Screen Plant Operator
2021-11-18
Respirable dust, <.1mg
0
Truck Driver
2019-04-22
Respirable dust, <.1mg
0
Washer Operator
2019-04-22
Respirable dust, <.1mg
0
Front-end Loader Operator
2019-04-22
Respirable dust, <.1mg
0
Utility Man
2015-02-10
Respirable dust, <.1mg
0
Scale Man
2013-08-15
Respirable dust, <.1mg
0
Scraper Operator
2013-08-15
Respirable dust, <.1mg
0
Welder, etc.
2007-04-12
Quartz, respirable, >1% Qtz
0.13
1.1
0.12
Laborer, Bullgang
2007-04-12
Respirable dust, <.1mg
0
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.
MAITRI CANYON 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.
Year
total case rate
days-away
fatal
2025
0.00
0.00
0.000
2024 *
4.66
2.33
0.000
2023 *
0.00
0.00
0.000
2022 *
2.29
0.00
0.000
2021 *
2.20
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
0.00
0.00
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
40
2025
39
2024
33
2023
32
2022
33
2021
34
2020
31
2019
30
2018
28
2017
24
2016
22
2015
21
2014
25
2013
23
2012
25
2011
26
2010
27
2009
32
2008
34
2007
35
2006
34
2005
34
2004
33
2003
33
2002
30
2001
29
2000
28
Source: MSHA quarterly employment and production, updated weekly.
MAITRI CANYON PLANT sits in Riverside 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.
Riverside County, California · Population 2,449,909
0.1%
Mining share of county employment
$89,672
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
27,773
0
0
0.0
2026 Q1
26,828
2
1
74.5
2025 Q4
24,853
0
0
0.0
2025 Q3
28,105
3
1
106.7
2025 Q2
28,777
0
0
0.0
2025 Q1
26,875
2
1
74.4
2024 Q4
23,840
0
0
0.0
2024 Q3
20,980
5
2
238.3
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
21,384
0
0
0.0
2024 Q1
19,700
0
0
0.0
2023 Q4
21,209
0
0
0.0
2023 Q3
22,229
3
1
135.0
2023 Q2
22,463
0
0
0.0
2023 Q1
19,864
0
0
0.0
2022 Q4
21,396
6
0
280.4
2022 Q3
22,453
0
0
0.0
2022 Q2
22,127
2
0
90.4
2022 Q1
21,427
0
0
0.0
2021 Q4
21,089
3
1
142.3
2021 Q3
23,262
1
0
43.0
2021 Q2
23,061
2
1
86.7
2021 Q1
23,425
3
1
128.1
2020 Q4
21,689
0
0
0.0
2020 Q3
21,337
0
0
0.0
2020 Q2
19,100
5
3
261.8
2020 Q1
20,276
5
1
246.6
2019 Q4
21,785
0
0
0.0
2019 Q3
22,674
0
0
0.0
2019 Q2
20,570
2
1
97.2
2019 Q1
20,412
0
0
0.0
2018 Q4
18,163
4
1
220.2
2018 Q3
18,954
0
0
0.0
2018 Q2
18,213
6
2
329.4
2018 Q1
17,127
9
6
525.5
2017 Q4
15,960
0
0
0.0
2017 Q3
14,904
2
0
134.2
2017 Q2
14,938
3
1
200.8
2017 Q1
15,274
4
0
261.9
2016 Q4
13,749
0
0
0.0
2016 Q3
14,830
0
0
0.0
2016 Q2
14,762
5
1
338.7
2016 Q1
14,570
0
0
0.0
2015 Q4
14,763
6
2
406.4
2015 Q3
14,041
0
0
0.0
2015 Q2
12,783
4
1
312.9
2015 Q1
12,020
0
0
0.0
2014 Q4
13,493
6
1
444.7
2014 Q3
14,253
0
0
0.0
2014 Q2
14,126
0
0
0.0
2014 Q1
14,022
1
0
71.3
2013 Q4
14,111
0
0
0.0
2013 Q3
13,484
3
1
222.5
2013 Q2
14,094
3
0
212.9
2013 Q1
14,524
0
0
0.0
2012 Q4
13,047
0
0
0.0
2012 Q3
13,537
0
0
0.0
2012 Q2
13,831
2
0
144.6
2012 Q1
14,914
4
0
268.2
2011 Q4
14,334
0
0
0.0
2011 Q3
14,298
0
0
0.0
2011 Q2
14,569
2
1
137.3
2011 Q1
13,052
0
0
0.0
2010 Q4
13,512
3
1
222.0
2010 Q3
14,633
0
0
0.0
2010 Q2
14,331
6
4
418.7
2010 Q1
14,764
4
2
270.9
2009 Q4
14,742
5
2
339.2
2009 Q3
17,855
8
3
448.1
2009 Q2
17,125
0
0
0.0
2009 Q1
15,061
2
1
132.8
2008 Q4
18,748
5
0
266.7
2008 Q3
18,400
1
0
54.3
2008 Q2
18,420
0
0
0.0
2008 Q1
17,474
1
0
57.2
2007 Q4
21,888
0
0
0.0
2007 Q3
21,962
2
0
91.1
2007 Q2
23,227
4
0
172.2
2007 Q1
21,833
0
0
0.0
2006 Q4
22,556
0
0
0.0
2006 Q3
21,655
3
0
138.5
2006 Q2
20,497
0
0
0.0
2006 Q1
20,724
8
1
386.0
2005 Q4
22,299
0
0
0.0
2005 Q3
21,880
7
0
319.9
2005 Q2
20,900
0
0
0.0
2005 Q1
19,788
14
1
707.5
2004 Q4
20,582
0
0
0.0
2004 Q3
21,847
0
0
0.0
2004 Q2
21,114
8
2
378.9
2004 Q1
21,225
20
6
942.3
2003 Q4
21,479
0
0
0.0
2003 Q3
20,254
11
4
543.1
2003 Q2
20,821
0
0
0.0
2003 Q1
18,408
9
4
488.9
2002 Q4
20,256
0
0
0.0
2002 Q3
18,927
0
0
0.0
2002 Q2
18,537
8
1
431.6
2002 Q1
18,338
27
13
1472.4
2001 Q4
18,177
0
0
0.0
2001 Q3
19,609
0
0
0.0
2001 Q2
17,825
3
2
168.3
2001 Q1
15,933
0
0
0.0
2000 Q4
17,640
0
0
0.0
2000 Q3
14,159
0
0
0.0
2000 Q2
16,081
0
0
0.0
2000 Q1
17,410
3
1
172.3
Fatalities at this mine
1 recorded
January 31, 1985CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorFatality · HANDTOOLS (NONPOWERED)
Foster Sand & Gravel · Caught in, under or between collapsing material or buildings
WHILE TRYING TO BREAK LOOSE BRIDGED MATERIAL AT SAND SURGE THE EE USING A PIECE OF REBAR WAS ENTRAPPED CAUSING A FATAL INJURY.
Reportable incidents
9 on file (excluding fatalities above)
2024 · 2 incidents
October 9, 2024CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDTOOLS (NONPOWERED)
Miner was changing the teeth on an excavator bucket (Cat 390 #1-15). The miner was using a hammer to strike the retaining pin on the tooth when a piece of steel broke and hit the miner in EE's right leg causing a laceration.
Miner was climbing down from feeder and stepped on berm. Miner rolled right ankle. Medical evaluation revealed fracture of distal fibula.
2022 · 1 incident
November 28, 2022CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
Miner was repairing the wash screw tub and was carrying a fabricated part to install. EE lost footing as EE walked under the tub and struck head on the flange of a nearby water pipe. EE received a laceration above the right eye. EE was taken to the clinic to receive treatment.
At approx 2:39 PM under cloudy cool conditions, EE had just completed repairs to vibratory screen (S-9) and had descended the catwalk to the ground. EE was preparing to enter the passenger side of the repair truck cab when EE succumbed to a seizure. Paramedics were called immediately and removed EE to seek medical attention.
2009 · 1 incident
January 30, 2009CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSLIP OR FALL OF PERSON
Employee seems to have fallen out of his loader following fueling. He does not remember what happened, but evidence at the scene indicates that the nozzle was left in the tank as he drove away. Injuries to the employee include broken ankle, shoulder, ribs, nose, and facial fractures.