Diamond T Natural Resources, LLC has $32K in proposed MSHA penalties and $4K outstanding across 3 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
9
Years on record
2000–2008
Latest incident
Jan 2008
Compliance record
MSHA citations since 2000
185
citations
45
significant & substantial
$32,183
proposed penalties
$27,308
paid to date
85% of proposed penalties paid to date, a $4,875 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.
185 citations across 1,044 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.
1
Section 107(a) orders
Most recent order: 2012-12-18.
On record since 2012.
Source: MSHA imminent-danger order records, updated weekly.
Diamond T Natural Resources, LLC has $32K in proposed MSHA penalties and $4K outstanding across 3 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.
$32K
proposed penalties
$31K
current assessed
$27K
paid to date
$4K
outstanding
179 assessments are final orders; 3 contested dockets.
Of $5K in penalties contested before the Commission, $4K was upheld in final decisions.
As of the most recent assessment on 2025-04-24.
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.
7citations taken to the federal commission · 4% of citations on record
Settled
2 · 29%
Stood as issued
5 · 71%
100%
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 6 decided S&S contests · industry: 79%
18%
Penalty reduction in decided contests
$5K proposed, $4K 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 2012-03-05.
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: 2025-02-20
14%
of limit-tested samples over the exposure limit
25
samples
7
limit-tested
Most sampled contaminants
Quartz, respirable, >1% Qtz81 over
Respirable dust, <.1mg15
Unlisted Particulate, respirable, <1% Qtz2
Show the individual readings (25)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2004-04-27
Quartz, respirable, >1% Qtz
0.77
0.47
1.64
Bulldozer Operator
2025-02-20
Respirable dust, <.1mg
0
Crusher Oper/Worker
2022-02-10
Respirable dust, <.1mg
0
Front-end Loader Operator
2022-02-10
Quartz, respirable, >1% Qtz
0.37
Front-end Loader Operator
2020-12-01
Respirable dust, <.1mg
0
Front-end Loader Operator
2017-05-31
Respirable dust, <.1mg
0
Front-end Loader Operator
2017-05-31
Respirable dust, <.1mg
0
Front-end Loader Operator
2014-01-22
Respirable dust, <.1mg
0
Front-end Loader Operator
2014-01-22
Respirable dust, <.1mg
0
Flotation/Concentrator Oper.
2014-01-22
Respirable dust, <.1mg
0
Mechanic
2009-06-16
Respirable dust, <.1mg
0
Mechanic
2009-06-16
Respirable dust, <.1mg
0
Front-end Loader Operator
2009-06-16
Respirable dust, <.1mg
0
Complete Load-Haul-Dump
2009-06-16
Unlisted Particulate, respirable, <1% Qtz
0.14
Complete Load-Haul-Dump
2005-04-14
Respirable dust, <.1mg
0
Supervisor, Co. Official
2005-04-14
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-04-14
Unlisted Particulate, respirable, <1% Qtz
0.12
Truck Driver
2004-06-08
Respirable dust, <.1mg
0
Bulldozer Operator
2004-04-27
Respirable dust, <.1mg
0
Supervisor, Co. Official
2004-04-27
Quartz, respirable, >1% Qtz
0.36
1.19
0.30
Front-end Loader Operator
2004-04-27
Quartz, respirable, >1% Qtz
1.06
1.6
0.66
Crusher Oper/Worker
2004-04-27
Quartz, respirable, >1% Qtz
0.22
0.74
0.30
Cleanup Man
2001-01-24
Quartz, respirable, >1% Qtz
0.22
1.7
0.13
Washer Operator
2001-01-24
Quartz, respirable, >1% Qtz
0.37
0.72
0.51
Mechanic
2001-01-24
Quartz, respirable, >1% Qtz
0.23
0.79
0.29
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.
Diamond T Natural Resources, LLC recorded 0.00 reportable injury cases per 100 full-time workers in 2011.
Injury rate, 2011
ⓘ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 2.56 and the all-US-mining average was 3.08 cases per 100 workers.
In California, metal and nonmetal mining averaged 2.71 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
2011 *
0.00
0.00
0.000
2010 *
0.00
0.00
0.000
2009 *
0.00
0.00
0.000
2008 *
6.96
6.96
0.000
2007 *
7.29
7.29
0.000
2006 *
0.00
0.00
0.000
2005 *
0.00
0.00
0.000
2004 *
8.06
8.06
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
8
2025
6
2024
5
2023
4
2022
5
2021
4
2020
3
2019
3
2018
3
2017
3
2016
4
2015
4
2014
5
2013
8
2012
9
2011
17
2010
21
2009
19
2008
16
2007
15
2006
17
2005
15
2004
15
2003
13
2002
12
2001
10
2000
10
Source: MSHA quarterly employment and production, updated weekly.
Diamond T Natural Resources, LLC sits in Sonoma County, California, where the Census mining category is 0.0% 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.
Sonoma County, California · Population 485,642
0.0%
Mining share of county employment
$102,840
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
1,935
0
0
0.0
2026 Q1
1,759
0
0
0.0
2025 Q4
1,691
0
0
0.0
2025 Q3
1,840
0
0
0.0
2025 Q2
2,300
2
0
869.6
2025 Q1
2,397
2
0
834.4
2024 Q4
1,783
0
0
0.0
2024 Q3
1,814
0
0
0.0
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
2,462
0
0
0.0
2024 Q1
2,243
0
0
0.0
2023 Q4
2,046
0
0
0.0
2023 Q3
2,150
0
0
0.0
2023 Q2
1,954
1
0
511.8
2023 Q1
2,060
2
0
970.9
2022 Q4
2,286
0
0
0.0
2022 Q3
2,401
0
0
0.0
2022 Q2
2,377
2
0
841.4
2022 Q1
2,133
1
0
468.8
2021 Q4
2,542
0
0
0.0
2021 Q3
2,484
0
0
0.0
2021 Q2
2,458
0
0
0.0
2021 Q1
1,140
0
0
0.0
2020 Q4
1,865
0
0
0.0
2020 Q3
1,822
0
0
0.0
2020 Q2
1,638
0
0
0.0
2020 Q1
1,751
2
0
1142.2
2019 Q4
1,762
0
0
0.0
2019 Q3
1,892
0
0
0.0
2019 Q2
1,755
2
0
1139.6
2019 Q1
1,648
0
0
0.0
2018 Q4
1,702
0
0
0.0
2018 Q3
1,607
0
0
0.0
2018 Q2
1,040
2
1
1923.1
2018 Q1
1,166
0
0
0.0
2017 Q4
1,412
0
0
0.0
2017 Q3
1,636
0
0
0.0
2017 Q2
1,615
0
0
0.0
2017 Q1
1,521
0
0
0.0
2016 Q4
1,669
1
0
599.2
2016 Q3
1,742
0
0
0.0
2016 Q2
1,601
0
0
0.0
2016 Q1
1,935
1
0
516.8
2015 Q4
2,388
0
0
0.0
2015 Q3
2,222
6
1
2700.3
2015 Q2
2,094
1
0
477.6
2015 Q1
2,199
7
1
3183.3
2014 Q4
2,435
0
0
0.0
2014 Q3
2,307
0
0
0.0
2014 Q2
2,153
2
0
928.9
2014 Q1
972
5
0
5144.0
2013 Q4
4,286
0
0
0.0
2013 Q3
3,747
0
0
0.0
2013 Q2
4,271
3
0
702.4
2013 Q1
3,557
4
0
1124.5
2012 Q4
4,476
16
5
3574.6
2012 Q3
3,692
0
0
0.0
2012 Q2
4,006
3
0
748.9
2012 Q1
3,872
0
0
0.0
2011 Q4
7,538
5
2
663.3
2011 Q3
6,912
0
0
0.0
2011 Q2
8,774
6
1
683.8
2011 Q1
7,911
0
0
0.0
2010 Q4
9,805
14
4
1427.8
2010 Q3
8,384
0
0
0.0
2010 Q2
8,797
5
2
568.4
2010 Q1
6,589
4
3
607.1
2009 Q4
9,488
0
0
0.0
2009 Q3
7,960
0
0
0.0
2009 Q2
7,851
0
0
0.0
2009 Q1
5,740
0
0
0.0
2008 Q4
7,932
5
1
630.4
2008 Q3
7,019
0
0
0.0
2008 Q2
7,551
3
0
397.3
2008 Q1
6,218
4
1
643.3
2007 Q4
6,413
0
0
0.0
2007 Q3
7,530
0
0
0.0
2007 Q2
6,684
8
3
1196.9
2007 Q1
6,795
0
0
0.0
2006 Q4
6,285
11
1
1750.2
2006 Q3
8,173
8
1
978.8
2006 Q2
5,608
0
0
0.0
2006 Q1
5,503
0
0
0.0
2005 Q4
6,358
5
0
786.4
2005 Q3
7,337
0
0
0.0
2005 Q2
2,192
0
0
0.0
2005 Q1
6,095
0
0
0.0
2004 Q4
6,516
6
2
920.8
2004 Q3
6,262
0
0
0.0
2004 Q2
6,656
5
1
751.2
2004 Q1
5,376
0
0
0.0
2003 Q4
7,365
4
2
543.1
2003 Q3
8,957
3
0
334.9
2003 Q2
7,207
0
0
0.0
2003 Q1
5,582
1
0
179.1
2002 Q4
6,645
0
0
0.0
2002 Q3
5,893
0
0
0.0
2002 Q2
5,564
2
2
359.5
2002 Q1
4,655
0
0
0.0
2001 Q4
5,240
8
6
1526.7
2001 Q3
5,137
0
0
0.0
2001 Q2
5,173
4
2
773.2
2001 Q1
4,905
8
3
1631.0
2000 Q4
1,682
0
0
0.0
2000 Q3
4,268
1
0
234.3
2000 Q2
4,757
0
0
0.0
2000 Q1
3,947
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
9 on file
2008 · 1 incident
January 30, 2008CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techMACHINERY
Employee was at the shop assisting the mechanic with welding, (between the hours of 10:am and 1:30pm) suffered flash burn to eye, was treated that evening at emergency room, with ointment and pads for eyes, told to take next day off, but able to return to work 2/1/08. He called in sick for 2/1/08.
2007 · 1 incident
January 5, 2007CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techHANDTOOLS (NONPOWERED)
Approx. 10 am a power pole near the slurry wash out station arced and popped. Someone noticed sparks from the pole. At 3:00 pm our employee complained to our plant manager that he was not feeling well from the odor that seemed to be around the wash station. He said he had even gotten sick and thrown up.
2003 · 1 incident
November 1, 2003CA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techMACHINERY
WHILE LIFTING THE CHUTE OF THE IMPACT, THE CHUTEBECAME JAMMED. EE WENT TO DISLODGE BUT IT SHIFTED AND CAUSED HIS LEFT RING FINGER TO BECOME CAUGHT AND SMASHED. DUE TO SEVERITY OF THE INJURY TH E DR. HAD TO AMPUTATE THE TIP OF HIS FINGER.
June 4, 2002CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerMACHINERY
WHILE USING THE GRINDER, EE HAD A PIECE OF METAL FLY UP & HIT HIS CHEEK WHICH CAUSED THE SHAVING TO DEFLECT & GO INTO HIS RIGHT EYE, CAUSING ABRASIONS TO EYE. HE DID THIS ON JUNE 4TH BUT DID N OT TELL ANYONE UNTIL JUNE 10TH. HE THOUGHT IT WOULD CLEAR UP ON ITS OWN. I SENT HIM TO THE CLINIC AS SOON AS WE COULD ON THE 10TH.
March 19, 2002CA · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerHANDTOOLS (NONPOWERED)
EE CUT HIS HAND BETWEEN 2 FINGERS HE DID NOT REPORT TO ME HE HAD TO SEND CLAIM FORM T HIM USING CERTIFIED MIAL HE DID NOT RETURN TO THE DR FOR FOLLOWUP HE TOOK HIS OWN STITCHES OUT DR SENT US RETURN TO WORK SLIP AS OF 4/26/00
March 20, 2000CA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDTOOLS (NONPOWERED)
WAS USING A REGULAR CARPENTERS HAMMER HIT THUMB RECEIVED MEDICAL ATTENTION AT CLINIC WAS ON RESTRICTED DUTY FOR 2 DAYS RETURNED TO FULL DUTY ON NEXT NORMAL WORKING DAY