Blasted Rock Quarry has $5K 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
7
Years on record
2004–2018
Latest incident
May 2018
Compliance record
MSHA citations since 2001
47
citations
10
significant & substantial
$5,355
proposed penalties
$5,355
paid to date
100% of proposed penalties paid to date, a $0 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.
Rate withheld: 429 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.
Blasted Rock Quarry has $5K 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.
$5K
proposed penalties
$5K
current assessed
$5K
paid to date
$0
outstanding
47 assessments are final orders; 0 contested dockets.
As of the most recent assessment on 2025-02-26.
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: 2025-08-14
0%
of limit-tested samples over the exposure limit
13
samples
7
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz7
Respirable dust, <.1mg6
Show the individual readings (13)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-08-14
Respirable dust, <.1mg
0
Front-end Loader Operator
2025-08-14
Quartz, respirable, >1% Qtz
0.13
0.89
0.15
Rotary Bucket Ex. Operator
2023-10-31
Respirable dust, <.1mg
0
Truck Driver
2023-04-18
Respirable dust, <.1mg
0
Front-end Loader Operator
2016-12-13
Respirable dust, <.1mg
0
Backhoe Operator
2016-12-13
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-09-02
Quartz, respirable, >1% Qtz
0.28
1.38
0.20
Backhoe Operator
2009-09-02
Quartz, respirable, >1% Qtz
0.18
1.65
0.11
Front-end Loader Operator
2009-09-02
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-09-02
Quartz, respirable, >1% Qtz
0.52
0.72
0.72
Crusher Oper/Worker
2003-06-17
Quartz, respirable, >1% Qtz
0.67
1.16
0.58
Front-end Loader Operator
2003-06-17
Quartz, respirable, >1% Qtz
0.5
1.23
0.41
Truck Driver
2003-06-17
Quartz, respirable, >1% Qtz
0.31
1.33
0.23
Crusher Oper/Worker
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
5
2023
4
2022
3
2021
3
2020
3
2019
2
2018
2
2017
3
2016
2
2015
2
2014
2
2013
3
2012
4
2011
4
2010
4
2009
5
2008
5
2007
6
2006
5
2005
5
2004
4
2003
5
2002
5
2001
5
2000
5
Source: MSHA quarterly employment and production, updated weekly.
Blasted Rock Quarry sits in Plumas County, California, where the Census mining category is 0.5% 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.
Plumas County, California · Population 19,607
0.5%
Mining share of county employment
$64,946
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
Joy Engineering · Caught in, under or between a moving and a stationary object
2100 screen was fully locked out/tagged out, when four employees were changing the belt on the screen. Injured employee's right hand got caught between the belt and hopper when they were sliding the belt in.
Two employees lifting a radiator,weight sifted toward the injured employee landing in his arms and abdomen. Employee felt a pain below his umbilicus. Employee continued to work his shift. Pain became worse over the next week and he reported it to his supervisor on Friday afternoon 10/16/09.
EE was assisting with lifting a screen used in the rock crushing plant and felt a pain in his lower mid abdomen below umbilicus. He did not report this and continued to work full time for 2 months until he was diagnosed with a hernia on 8/7/2008. Injury reported 8/8/2008.
May 20, 2008CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanOTHER
Sierra Aggregates · Caught in, under or between a moving and a stationary object
Employee standing in doorway of crusher shack the wind blew the door closed onto right arm hitting the door casing.
2006 · 1 incident
May 31, 2006CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON