Ten Mile River Plant has $11K in proposed MSHA penalties and $0 outstanding across 0 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
3
Years on record
1992–1997
Latest incident
May 1997
Compliance record
MSHA citations since 2000
67
citations
19
significant & substantial
$11,214
proposed penalties
$11,214
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
43
inspections on record
591
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: 591 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Ten Mile River Plant has $11K in proposed MSHA penalties and $0 outstanding across 0 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.
$11K
proposed penalties
$11K
current assessed
$11K
paid to date
$0
outstanding
66 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2022-07-14.
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.
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: 2022-07-13, 4 years ago
0%
of limit-tested samples over the exposure limit
10
samples
3
limit-tested
Most sampled contaminants
Respirable dust, <.1mg7
Quartz, respirable, >1% Qtz3
Show the individual readings (10)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2022-07-13
Respirable dust, <.1mg
0
Backhoe Operator
2016-03-29
Quartz, respirable, >1% Qtz
0.15
1.3
0.12
Lab Technician
2013-08-14
Respirable dust, <.1mg
0
Front-end Loader Operator
2013-08-14
Respirable dust, <.1mg
0
Crusher Oper/Worker
2013-08-14
Quartz, respirable, >1% Qtz
0.22
1.1
0.20
Belt Cleaner
2009-02-18
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-02-18
Respirable dust, <.1mg
0
Cleanup Man
2009-02-18
Quartz, respirable, >1% Qtz
0.16
1.51
0.11
Utility Man
2005-06-07
Respirable dust, <.1mg
0
Laborer, Bullgang
2005-06-07
Respirable dust, <.1mg
0
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.
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year
Employees
2026
4
2025
4
2024
0
2023
2
2022
4
2021
2
2020
1
2019
1
2018
1
2017
4
2016
4
2015
2
2014
4
2013
5
2012
5
2010
4
2009
4
2008
5
2007
4
2006
4
2005
3
2004
3
2003
3
2002
2
2001
2
2000
3
Source: MSHA quarterly employment and production, updated weekly.
Ten Mile River Plant sits in Mendocino County, California, where the Census mining category is 0.3% 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.
Mendocino County, California · Population 90,709
0.3%
Mining share of county employment
$64,688
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
25
0
0
0.0
2026 Q1
64
0
0
0.0
2025 Q4
317
0
0
0.0
2025 Q3
161
0
0
0.0
2025 Q2
254
0
0
0.0
2025 Q1
190
0
0
0.0
2024 Q4
0
0
0
2024 Q3
0
0
0
Show 94 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
0
0
0
2024 Q1
0
0
0
2023 Q4
0
0
0
2023 Q3
22
0
0
0.0
2023 Q2
62
0
0
0.0
2023 Q1
62
0
0
0.0
2022 Q4
102
0
0
0.0
2022 Q3
31
1
0
32258.1
2022 Q2
14
0
0
0.0
2022 Q1
151
0
0
0.0
2021 Q4
63
0
0
0.0
2021 Q3
22
0
0
0.0
2021 Q2
76
0
0
0.0
2021 Q1
13
0
0
0.0
2020 Q4
145
0
0
0.0
2020 Q3
41
0
0
0.0
2020 Q2
0
0
0
2020 Q1
11
0
0
0.0
2019 Q4
19
0
0
0.0
2019 Q3
33
0
0
0.0
2019 Q2
0
0
0
2019 Q1
0
2
0
2018 Q4
0
0
0
2018 Q3
0
2
1
2018 Q2
0
0
0
2018 Q1
68
0
0
0.0
2017 Q4
137
0
0
0.0
2017 Q3
700
0
0
0.0
2017 Q2
820
0
0
0.0
2017 Q1
549
6
2
10929.0
2016 Q4
173
0
0
0.0
2016 Q3
1,507
0
0
0.0
2016 Q2
295
0
0
0.0
2016 Q1
312
8
2
25641.0
2015 Q4
764
0
0
0.0
2015 Q3
209
1
0
4784.7
2015 Q2
92
0
0
0.0
2015 Q1
302
0
0
0.0
2014 Q4
842
8
2
9501.2
2014 Q3
1,489
0
0
0.0
2014 Q2
768
0
0
0.0
2014 Q1
143
0
0
0.0
2013 Q4
1,257
0
0
0.0
2013 Q3
2,024
8
2
3952.6
2013 Q2
1,552
0
0
0.0
2013 Q1
1,049
0
0
0.0
2012 Q4
918
0
0
0.0
2012 Q3
2,502
2
0
799.4
2012 Q2
1,587
0
0
0.0
2012 Q1
503
0
0
0.0
2010 Q4
330
0
0
0.0
2010 Q3
814
0
0
0.0
2010 Q2
756
0
0
0.0
2010 Q1
99
3
2
30303.0
2009 Q4
746
0
0
0.0
2009 Q3
805
0
0
0.0
2009 Q2
1,251
2
0
1598.7
2009 Q1
887
0
0
0.0
2008 Q4
1,278
0
0
0.0
2008 Q3
2,462
1
0
406.2
2008 Q2
1,475
0
0
0.0
2008 Q1
602
0
0
0.0
2007 Q4
1,617
0
0
0.0
2007 Q3
2,317
0
0
0.0
2007 Q2
670
4
3
5970.1
2007 Q1
339
0
0
0.0
2006 Q4
1,253
5
1
3990.4
2006 Q3
695
0
0
0.0
2006 Q2
488
1
0
2049.2
2006 Q1
235
4
1
17021.3
2005 Q4
772
0
0
0.0
2005 Q3
892
0
0
0.0
2005 Q2
787
0
0
0.0
2005 Q1
276
3
1
10869.6
2004 Q4
644
0
0
0.0
2004 Q3
753
2
0
2656.0
2004 Q2
1,096
0
0
0.0
2004 Q1
467
0
0
0.0
2003 Q4
710
0
0
0.0
2003 Q3
1,141
0
0
0.0
2003 Q2
816
0
0
0.0
2003 Q1
741
0
0
0.0
2002 Q4
760
1
1
1315.8
2002 Q3
817
0
0
0.0
2002 Q2
845
0
0
0.0
2002 Q1
396
0
0
0.0
2001 Q4
480
0
0
0.0
2001 Q3
892
0
0
0.0
2001 Q2
850
0
0
0.0
2001 Q1
565
0
0
0.0
2000 Q4
1,047
1
0
955.1
2000 Q3
1,277
0
0
0.0
2000 Q2
1,643
0
0
0.0
2000 Q1
811
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
3 on file
1997 · 1 incident
May 20, 1997CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorMACHINERY
OIL CAN JAMMED WHILE OILING CRUSHER, REACHED INTO GET CAN WHEN BELTS ENGAGED AND CRUSHED HAND.
1992 · 2 incidents
June 15, 1992CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON