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: 212 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Five Bridges Aggregate Plant has $2K in proposed MSHA penalties and $0 outstanding across 1 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.
$2K
proposed penalties
$2K
current assessed
$2K
paid to date
$0
outstanding
26 assessments are final orders; 1 contested dockets.
Of $100 in penalties contested before the Commission, $0 was upheld in final decisions.
As of the most recent assessment on 2024-06-04.
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 · 4% of citations on record
Vacated or withdrawn
1 · 100%
100%
Penalty reduction in decided contests
$100 proposed, $0 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 A dismissed or defaulted contest leaves the citation standing as issued; a vacated or withdrawn citation is removed from the violation record.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 2010-11-30.
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: 2019-04-15, 7 years ago
0%
of limit-tested samples over the exposure limit
5
samples
3
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz2
Respirable dust, <.1mg2
Nuisance dust, respirable, <1% Qtz1
Show the individual readings (5)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2019-04-15
Respirable dust, <.1mg
0
Truck Driver
2002-06-25
Quartz, respirable, >1% Qtz
0.18
0.92
0.20
Front-end Loader Operator
2002-06-25
Respirable dust, <.1mg
0
Scraper Operator
2000-08-23
Quartz, respirable, >1% Qtz
0.28
1.4
0.20
Front-end Loader Operator
2000-08-23
Nuisance dust, respirable, <1% Qtz
0.18
10
0.02
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.
Five Bridges Aggregate Plant recorded 0.00 reportable injury cases per 100 full-time workers in 2007.
Injury rate, 2007
ⓘ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 and are withheld below 20,000 hours in a year. Employment reports reach back to 1983, but those earlier years come from MSHA's archived file format and are not used in rates.
0.00
total case rate
0.00
days-away rate
0.000
fatality rate
No reportable injury cases in any year shown. Employee-hours were reported in each of those years, so these are true zeros rather than missing data. Citations, listed in the compliance record above, are inspector-found violations and are counted separately from worker injuries.
Below average. The US metal and nonmetal mining average was 3.30 and the all-US-mining average was 3.77 cases per 100 workers.
In California, metal and nonmetal mining averaged 3.87 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.
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
7
2025
3
2024
5
2020
3
2019
1
2018
2
2011
4
2010
1
2009
4
2008
12
2007
14
2006
12
2005
12
2004
11
2003
10
2002
13
2001
13
2000
10
1999
11
1998
12
1997
11
1996
8
1995
6
1994
7
1993
7
1992
8
1991
9
1990
9
1989
9
1988
5
1987
4
1986
3
1985
3
1984
4
1983
4
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Five Bridges Aggregate Plant sits in Inyo County, California, where the Census mining category is 1.7% 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.
Inyo County, California · Population 18,803
1.7%
Mining share of county employment
$72,432
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; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. 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 Q1
3,859
0
0
0.0
2025 Q4
405
0
0
0.0
2024 Q2
2,464
1
0
405.8
2020 Q2
2,011
0
0
0.0
2020 Q1
735
0
0
0.0
2019 Q2
371
0
0
0.0
2019 Q1
187
0
0
0.0
2018 Q4
644
0
0
0.0
Show 47 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2018 Q3
715
0
0
0.0
2018 Q2
274
0
0
0.0
2011 Q2
629
0
0
0.0
2011 Q1
3,034
0
0
0.0
2010 Q3
0
0
0
2010 Q2
480
0
0
0.0
2010 Q1
440
0
0
0.0
2009 Q4
1,585
0
0
0.0
2009 Q3
0
0
0
2009 Q2
0
0
0
2009 Q1
5,104
0
0
0.0
2008 Q4
3,296
0
0
0.0
2008 Q3
3,281
0
0
0.0
2008 Q2
3,394
0
0
0.0
2008 Q1
5,333
0
0
0.0
2007 Q4
4,195
0
0
0.0
2007 Q3
5,524
0
0
0.0
2007 Q2
5,524
0
0
0.0
2007 Q1
5,600
0
0
0.0
2006 Q4
3,216
0
0
0.0
2006 Q3
4,452
0
0
0.0
2006 Q2
4,814
0
0
0.0
2006 Q1
4,373
5
0
1143.4
2005 Q4
3,466
0
0
0.0
2005 Q3
3,454
0
0
0.0
2005 Q2
2,934
0
0
0.0
2005 Q1
3,115
0
0
0.0
2004 Q4
2,693
0
0
0.0
2004 Q3
3,929
0
0
0.0
2004 Q2
3,415
3
0
878.5
2004 Q1
2,455
0
0
0.0
2003 Q4
2,427
0
0
0.0
2003 Q3
2,625
0
0
0.0
2003 Q2
2,505
0
0
0.0
2003 Q1
3,196
0
0
0.0
2002 Q4
3,020
3
1
993.4
2002 Q3
3,380
0
0
0.0
2002 Q2
5,016
4
0
797.4
2002 Q1
2,852
0
0
0.0
2001 Q4
2,819
0
0
0.0
2001 Q3
2,947
0
0
0.0
2001 Q2
1,968
4
0
2032.5
2001 Q1
2,663
0
0
0.0
2000 Q4
2,983
0
0
0.0
2000 Q3
3,453
6
0
1737.6
2000 Q2
2,679
0
0
0.0
2000 Q1
2,819
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
33 on file
2005 · 1 incident
June 22, 2005CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS
WORKING ON PLANT, HE JUMPED TO THE GROUND, INJURING FOOT.
August 28, 2001CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
FILED A CLAIM FOR THIS ACCIDENT ON 1-2-90. RETURNED TO WORK 1-2-90. ONLY ON THE JOB TIL 2-3-90. HAS BEEN OFF WORK SINCE. ENDED UP HAVING BACK SURGERY. AS OF NOW WE DON'T KNOW IF HE WILL B E ABLE TO RETURN TO WORK.
1989 · 1 incident
December 11, 1989CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDLING OF MATERIALS