Diamond Quarry has $102K in proposed MSHA penalties and $50K outstanding across 2 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
5
Years on record
1989–2005
Latest incident
Mar 2005
Compliance record
MSHA citations since 2000
289
citations
83
significant & substantial
$102,201
proposed penalties
$45,359
paid to date
44% of proposed penalties paid to date, a $56,842 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
81
inspections on record
1,439
inspection hours
20.1
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.
289 citations across 1,439 inspection hours.
Source: MSHA inspections data, updated weekly.
Imminent-danger orders
ⓘA Section 107(a) order removes miners from an area when an inspector finds an imminent danger. Each order is lifted once the condition is corrected, so this counts orders issued, not orders now in effect.
2
Section 107(a) orders
Most recent order: 2012-08-23.
On record since 2012.
Source: MSHA imminent-danger order records, updated weekly.
Diamond Quarry has $102K in proposed MSHA penalties and $50K 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.
$102K
proposed penalties
$95K
current assessed
$45K
paid to date
$50K
outstanding
276 assessments are final orders; 2 contested dockets.
Of $29K in penalties contested before the Commission, $22K was upheld in final decisions.
As of the most recent assessment on 2025-10-20.
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.
25citations taken to the federal commission · 9% of citations on record
Settled
25 · 100%
88%
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 8 decided S&S contests · industry: 79%
24%
Penalty reduction in decided contests
$29K proposed, $22K 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 2011-10-20.
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: 2025-04-29
0%
of limit-tested samples over the exposure limit
20
samples
11
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz10
Fibers, >5um4
Nuisance dust, respirable, <1% Qtz3
Respirable dust, <.1mg3
Show the individual readings (20)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2025-04-29
Quartz, respirable, >1% Qtz
0.15
Crusher Oper/Worker
2021-04-16
Quartz, respirable, >1% Qtz
0.18
Laborer, Bullgang
2021-04-16
Respirable dust, <.1mg
0
Complete Load-Haul-Dump
2017-08-30
Quartz, respirable, >1% Qtz
1.37
1.59
0.86
Front-end Loader Operator
2017-08-30
Quartz, respirable, >1% Qtz
1.21
1.62
0.75
Dry Screen Plant Operator
2015-03-25
Nuisance dust, respirable, <1% Qtz
0.12
10
0.01
Crusher Oper/Worker
2015-03-25
Respirable dust, <.1mg
0
Laborer, Bullgang
2010-06-22
Nuisance dust, respirable, <1% Qtz
0.24
10
0.02
Rotary Bucket Ex. Operator
2010-06-22
Quartz, respirable, >1% Qtz
0.3
2.27
0.13
Laborer, Bullgang
2010-06-22
Nuisance dust, respirable, <1% Qtz
0.44
10
0.04
Utility Man
2005-08-30
Quartz, respirable, >1% Qtz
0.38
1.18
0.32
Cleanup Man
2005-08-30
Respirable dust, <.1mg
0
Mechanic
2005-08-30
Quartz, respirable, >1% Qtz
0.6
1.65
0.36
Front-end Loader Operator
2005-08-30
Quartz, respirable, >1% Qtz
0.51
1.66
0.31
Crusher Oper/Worker
2002-04-23
Fibers, >5um
0
Dry Screen Plant Operator
2002-04-23
Fibers, >5um
0
Dry Screen Plant Operator
2002-04-23
Fibers, >5um
0
Front-end Loader Operator
2002-04-23
Fibers, >5um
0
Front-end Loader Operator
2002-04-10
Quartz, respirable, >1% Qtz
0.21
1.54
0.14
Crusher Oper/Worker
2002-04-10
Quartz, respirable, >1% Qtz
0.54
1.94
0.28
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.
Diamond Quarry recorded 0.00 reportable injury cases per 100 full-time workers in 2018.
Injury rate, 2018
ⓘ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 1.95 and the all-US-mining average was 2.33 cases per 100 workers.
In California, metal and nonmetal mining averaged 1.92 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
2018 *
0.00
0.00
0.000
2004 *
0.00
0.00
0.000
2003 *
6.83
6.83
0.000
2002 *
9.31
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
10
2025
10
2024
10
2023
9
2022
7
2021
7
2020
10
2019
13
2018
11
2017
10
2016
10
2015
7
2014
4
2013
6
2012
7
2011
6
2010
7
2009
12
2008
9
2007
9
2006
8
2005
17
2004
15
2003
14
2002
14
2001
15
2000
18
Source: MSHA quarterly employment and production, updated weekly.
Diamond Quarry sits in El Dorado 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.
El Dorado County, California · Population 192,299
0.1%
Mining share of county employment
$106,190
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
4,982
0
0
0.0
2026 Q1
2,645
0
0
0.0
2025 Q4
4,981
1
0
200.8
2025 Q3
4,741
0
0
0.0
2025 Q2
4,821
2
0
414.9
2025 Q1
3,449
0
0
0.0
2024 Q4
5,807
0
0
0.0
2024 Q3
4,448
0
0
0.0
Show 93 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
3,876
3
1
774.0
2024 Q1
2,501
0
0
0.0
2023 Q4
4,682
1
0
213.6
2023 Q3
4,348
7
0
1609.9
2023 Q2
3,426
0
0
0.0
2023 Q1
2,501
0
0
0.0
2022 Q4
3,322
0
0
0.0
2022 Q3
3,201
0
0
0.0
2022 Q2
2,996
3
0
1001.3
2022 Q1
2,701
0
0
0.0
2021 Q4
2,892
1
0
345.8
2021 Q3
3,375
0
0
0.0
2021 Q2
3,024
2
1
661.4
2021 Q1
2,537
0
0
0.0
2020 Q3
3,933
0
0
0.0
2020 Q2
3,330
0
0
0.0
2020 Q1
4,537
1
0
220.4
2019 Q4
4,968
0
0
0.0
2019 Q3
5,894
3
0
509.0
2019 Q2
4,954
0
0
0.0
2019 Q1
3,540
3
0
847.5
2018 Q4
5,177
2
0
386.3
2018 Q3
5,662
0
0
0.0
2018 Q2
4,900
8
1
1632.7
2018 Q1
4,438
0
0
0.0
2017 Q4
5,174
20
10
3865.5
2017 Q3
4,523
10
2
2210.9
2017 Q2
3,496
0
0
0.0
2017 Q1
2,145
4
1
1864.8
2016 Q4
5,085
0
0
0.0
2016 Q3
5,344
11
2
2058.4
2016 Q2
5,000
0
0
0.0
2016 Q1
3,115
0
0
0.0
2015 Q4
3,727
1
0
268.3
2015 Q3
3,753
7
2
1865.2
2015 Q2
3,729
0
0
0.0
2015 Q1
2,246
7
0
3116.7
2014 Q4
2,985
0
0
0.0
2014 Q3
2,372
0
0
0.0
2014 Q2
1,633
0
0
0.0
2014 Q1
0
3
0
2013 Q3
2,369
2
1
844.2
2013 Q2
2,037
0
0
0.0
2013 Q1
1,502
0
0
0.0
2012 Q4
2,239
0
0
0.0
2012 Q3
2,745
12
2
4371.6
2012 Q2
3,129
30
10
9587.7
2012 Q1
2,500
0
0
0.0
2011 Q4
2,724
0
0
0.0
2011 Q2
2,522
0
0
0.0
2011 Q1
345
0
0
0.0
2010 Q4
1,875
0
0
0.0
2010 Q3
2,503
0
0
0.0
2010 Q2
1,858
21
15
11302.5
2010 Q1
2,268
0
0
0.0
2009 Q4
4,292
0
0
0.0
2009 Q3
3,523
0
0
0.0
2009 Q2
4,278
2
0
467.5
2009 Q1
4,308
0
0
0.0
2008 Q4
3,388
0
0
0.0
2008 Q3
4,477
0
0
0.0
2008 Q2
5,393
7
1
1298.0
2008 Q1
2,725
0
0
0.0
2007 Q3
4,740
0
0
0.0
2007 Q2
3,782
0
0
0.0
2007 Q1
1,896
0
0
0.0
2006 Q4
3,143
0
0
0.0
2006 Q3
3,443
0
0
0.0
2006 Q2
3,259
1
0
306.8
2006 Q1
3,670
2
0
545.0
2005 Q3
9,037
8
2
885.2
2005 Q2
8,904
0
0
0.0
2005 Q1
7,925
14
5
1766.6
2004 Q4
7,510
0
0
0.0
2004 Q3
8,306
7
2
842.8
2004 Q2
8,435
0
0
0.0
2004 Q1
7,089
2
0
282.1
2003 Q4
7,364
3
1
407.4
2003 Q3
7,506
0
0
0.0
2003 Q2
6,825
5
0
732.6
2003 Q1
7,567
5
1
660.8
2002 Q4
6,638
0
0
0.0
2002 Q3
7,770
0
0
0.0
2002 Q2
1,716
7
2
4079.3
2002 Q1
5,347
0
0
0.0
2001 Q4
5,347
2
0
374.0
2001 Q3
6,608
3
0
454.0
2001 Q2
6,746
0
0
0.0
2001 Q1
5,962
5
1
838.6
2000 Q4
7,292
0
0
0.0
2000 Q3
7,300
0
0
0.0
2000 Q2
6,673
0
0
0.0
2000 Q1
4,772
22
11
4610.2
No fatalities recorded at this mine.
Reportable incidents
5 on file
2005 · 1 incident
March 30, 2005CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDLING OF MATERIALS
Sierra Rock · Over-exertion in pulling or pushing objects
EE WAS INSTALLING A HYDRAULIC HOSE ON A 560 LOADER. EE PULLED ON THE HOSE AND FELT PAIN IN HIS WRIST; HAD SLIGHT SWELLING IMMEDIATELY. EE DID NOT INFORM ANYONE UNITL FRIDAY, 4/1/05 & EE REFUSED TO SEE DOCTOR. ON MONDAY, 4/4/05, EE STILL COMPLAINED OF PAIN, BUT STILL REFUSED TO SEE DOCTOR. ON TUESDAY, 4/5/05, EE ASKED TO SEE DOCTOR. TAKEN TO DOCTOR 4/6/05.
EMPLOYEE STATES HE RAN OUT OF ACETYINE ON WELDING TRUCK WHILE WORKING ON PROJECT. TOOK OUT EMPTY TANK AND WENT TO LIFT IN A FULL ONE, ALONE. WHILE LIFTING, FELT PAIN IN LOWER BACK. DID NOT REPORT INJURY TO SAFETY COORDINATOR UNTIL AFTER NOON ON 10/22. CAME IN TO WORK ON 10/23. LEFT EARLY BECAUSE OF BACK PAIN. DID NOT COME IN 10/24. DR DIAGNOSED LOWER BACK MUSCLE STRAIN.
2002 · 1 incident
March 19, 2002CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
WHILE EXITING HAUL TRUCK EMPLOYEE MISSED STEP WITH L FOOT, TURNED LOOSE OF HAND RAIL & FELL TO GROUND, LANDING ON HIS L SIDE. HE WAS ATTEMPTING TO CLIMB DOWN A LADDER IN FORWARD POSITION, INST EAD OF BACKWARDS. ACCIDENT RESULTED IN; BROKEN PELVIS, FRACTURED SHOULDER & E BROKEN RIBS. HAUL TRUCK WAS PARKED.
1989 · 1 incident
January 18, 1989CA · Metal/Non-Metaldrill operatorMACHINERY
HAD DRIFTER ALL THE WAY TO TOP OF DRILL CHANGING DRILL STEEL. CHAIN THAT DRIFTER RIDES ON BROKE. DRIFTER FELL, HITTING DRILL STEEL. DRILL STEEL FELL OVER KNOCKING HIM TO THE GROUND. IN THE FA LL HE FRACTURED HIS LEFT HIP.