SIERRA ROCK PRODUCTS has $88K in proposed MSHA penalties and $0 outstanding across 11 contested dockets, plus health sampling and the full incident record.
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Fatalities
3
Total incidents
28
Years on record
1984–1995
Latest incident
Nov 1995
Compliance record
MSHA citations since 2000
222
citations
57
significant & substantial
$87,796
proposed penalties
$58,332
paid to date
66% of proposed penalties paid to date, a $29,464 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.
222 citations across 1,384 inspection hours.
Source: MSHA inspections data, updated weekly.
SIERRA ROCK PRODUCTS has $88K in proposed MSHA penalties and $0 outstanding across 11 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.
$88K
proposed penalties
$58K
current assessed
$58K
paid to date
$0
outstanding
214 assessments are final orders; 11 contested dockets.
Of $113K in penalties contested before the Commission, $29K was upheld in final decisions.
As of the most recent assessment on 2026-02-24.
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.
33citations taken to the federal commission · 15% of citations on record
Settled
31 · 94%
Vacated or withdrawn
2 · 6%
85%
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 Vacated and withdrawn citations, and settlements that removed the designation, count against.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 20 decided S&S contests · industry: 79%
74%
Penalty reduction in decided contests
$113K proposed, $29K 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 2020-06-09.
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: 2014-08-06, 12 years ago
0%
of limit-tested samples over the exposure limit
4
samples
1
limit-tested
Most sampled contaminants
Fibers, >5um2
Respirable dust, <.1mg2
Asbestos 2.0f/ml1
Show the individual readings (5)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2014-08-06
Respirable dust, <.1mg
0
Supervisor, Co. Official
2009-11-03
Respirable dust, <.1mg
0
Laborer, Bullgang
2002-04-11
Asbestos 2.0f/ml
0.06
2
0.03
Dry Screen Plant Operator
2002-04-11
Fibers, >5um
0.15
Dry Screen Plant Operator
2002-04-11
Fibers, >5um
0.05
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.
SIERRA ROCK PRODUCTS recorded 0.00 reportable injury cases per 100 full-time workers in 2003.
Injury rate, 2003
ⓘ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
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 3.76 and the all-US-mining average was 4.43 cases per 100 workers.
In California, metal and nonmetal mining averaged 4.42 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
2003 *
0.00
0.00
0.000
2002 *
0.00
0.00
0.000
2001 *
0.00
0.00
0.000
2000 *
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
7
2025
6
2024
7
2023
6
2022
5
2021
5
2020
5
2019
6
2018
6
2017
9
2016
8
2015
7
2014
7
2013
7
2012
6
2011
6
2010
5
2009
8
2008
10
2007
11
2006
10
2005
9
2004
10
2003
10
2002
12
2001
13
2000
13
Source: MSHA quarterly employment and production, updated weekly.
SIERRA ROCK PRODUCTS sits in Tuolumne 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.
Tuolumne County, California · Population 54,873
0.3%
Mining share of county employment
$72,259
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
Sierra Rock Products · Caught in, under or between a moving and a stationary object
THE VICTIM WAS OWNER/OPERATOR OF A TEN-WHEEL PETERBUILT GRAVEL TRUCK. HE REGULARLY HAULED FINISHED PRODUCT FROM THE STOCKPILE AT THIS PROPERTY TO CUSTOMERS LOCATED ON THE WESTERN SLOPE OF THE SIERRA NEVADA MOUNTAINS. THE MORNING OF THE ACCIDENT, THE VICTIM STOPPED HIS TRUCK ABOUT 20' FROM THE END OF THE SCALE WHERE THE LOAD WAS TO BE WEIGHED. A DOUBLE TRAILER WAS PARKED ON THE SCAL
February 23, 1991CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorFatality · IGNITION OR EXPLOSION OF GAS OR DUST
EMPL & FOREMAN HAD BEEN WELDING ADDITIONAL FITTINGS ON PRTABLE FUEL TANKS. TANKS HAD BEEN FILLED WITH WATER DURING WELDING OPERATION. AFTER FINISHING WLEDING TANKS WERE BEING DRAINED & FOREMAN WALKED INTO SHOP TO WORK ON HOSES. FOR SOME REASON UNKNOWN TO US EMPL CLIMBED IN BETWEEN FUEL TANKS & EXPLOSION OCCURED CAUSING INSTAND DEATH. CAUSE OF IGNITION IS UNKNOWN.
March 10, 1984CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techFatality · MACHINERY
#1 DECEASED FAILED TO FOLLOW STANDARD LOCK OUT PROCEDURE #2 WARNING HORN NOT OPERABLE #3 OPERATOR FAILED TO CLEAR ALL MACHINES BEFORE STARING PLANT. CRUSHED BETWEEN ROLLS FROM FEET TO CHEST.
Reportable incidents
25 on file (excluding fatalities above)
1995 · 1 incident
November 15, 1995CA · Metal/Non-Metalprep plant foreman, supervisor, mill plant supervisor, kiln supervisorSLIP OR FALL OF PERSON
WORKER WAS BREKING AN OC\VERSIZE ROCK WITH A SLEDGEHAMMER ROCK CHIP STRUCK RT EYE DAMAGE WAS A SLIGHT SCRATCH ON EYE BALL NO LASTING DAMAGE GLASSES ARE PROVIDED & THIS EMPLOYEE ALWASYS WEARS T HEM EMPLOYEE COULD NOT EXPLAIN WHY HE DID NOT HAVE THEM ON THIS TIME
1990 · 1 incident
January 6, 1990CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorHANDLING OF MATERIALS
UNLOADING STEEL & A PIECE OF STEEL <HEEL PLATE| FELL ON LEFT BIG TOE THEY WERE UNLOADING 10 SMALL PIECES OF STEEL BY HAND & 1 PIECE SLIPPOED OUT OF I NAME HAND & FELL ON HIS TOE
1988 · 6 incidents
December 7, 1988CA · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDTOOLS (NONPOWERED)
WORKING ON A MOTOR ON THE PLANT, WHEN CLIMBING DOWN HE CAUGHT HIS RING ON A SHAKER SCREEN AND CUT HIS FINGER BADLY.
April 20, 1988CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
CARRYING PIECE 2F STEEL, WHICH SLIPPED IN HAND. BURR CUT AND PUNCTURED PALM OF RIGHT HAND.
January 25, 1988CA · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorHANDLING OF MATERIALS
Sierra Rock Products · Caught in, under or between a moving and a stationary object
I NAME AND I NA4E WERE REPLACING SHAKER SCREEN IN TO FRAME WORK, SCREEN SLIPPED INTO FRAME TO FAST FOR I NAME TO REMOVE HIS FINGER COMPLETELY. THE FINGER WAS CUT OPEN BY THE S CREEN. I NAME A ADMINISTERED FI9ST AID AND RETURNED TO W ORK. LATER IN WEK FINGER BECAME INFECTED
January 6, 1988CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
I NAME STRUCK A3ROCK WITH THE SLEDGE HAMMER AND IT BOUNCED OFF OF THE ROCK AND HHIT THE SIDE OF HIS RIGHT FOOT, BREAKING TWO BONES.
May 17, 1987CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
Sierra Rock Products · Caught in, under or between a moving and a stationary object
EMP WAS PULLING3A HYD. PUMP ON A LOADER - THE PUMP SLIPPED AND SMASHED HIS FINGER
February 25, 1987CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
I.NAME RAN INTO3A STEEL BEAM RESULTED IN A CONCUSHION AND 2 CUTS TO THE FOREHEAD
November 6, 1986CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
WHILE PUTTING A3WHEEL ON THE SHAFT OF THE ROLLS I.NAME WAS HOLDING THE WHEEL A PIECE OF STEEL WHICH I.NAME WAS HITTING WITH A SLEDGE HAMMER I.NAME SMASHED I.NAME HAND