Cerne Calcium Co., LLC has $71K in proposed MSHA penalties and $0 outstanding across 1 contested dockets, plus health sampling and the full incident record.
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Fatalities
0
Total incidents
8
Years on record
1984–2024
Latest incident
Jul 2024
Compliance record
MSHA citations since 2000
209
citations
37
significant & substantial
$71,180
proposed penalties
$67,168
paid to date
94% of proposed penalties paid to date, a $4,012 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: 907 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
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: 2023-08-16.
On record since 2015.
Source: MSHA imminent-danger order records, updated weekly.
Cerne Calcium Co., LLC has $71K 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.
$71K
proposed penalties
$67K
current assessed
$67K
paid to date
$0
outstanding
207 assessments are final orders; 1 contested dockets.
Of $12K in penalties contested before the Commission, $8K was upheld in final decisions.
As of the most recent assessment on 2025-09-30.
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 · 0% of citations on record
Settled
1 · 100%
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 1 decided S&S contests · industry: 79%
33%
Penalty reduction in decided contests
$12K proposed, $8K 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 2023-11-30.
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: 2025-09-30
8%
of limit-tested samples over the exposure limit
29
samples
26
limit-tested
Most sampled contaminants
Nuisance dust, total, <1% Qtz142 over
Nuisance dust, respirable, <1% Qtz12
Respirable dust, <.1mg3
Show the individual readings (29)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2009-02-17
Nuisance dust, total, <1% Qtz
26.03
10
2.60
Crusher Oper/Worker
2009-02-17
Nuisance dust, total, <1% Qtz
14.7
10
1.47
Crusher Oper/Worker
2025-09-30
Nuisance dust, respirable, <1% Qtz
0.75
10
0.08
Bagging Operator
2025-09-30
Nuisance dust, respirable, <1% Qtz
0.16
10
0.02
Front-end Loader Operator
2025-09-30
Respirable dust, <.1mg
0
Mechanic
2025-09-30
Respirable dust, <.1mg
0
Flotation/Concentrator Oper.
2021-10-05
Respirable dust, <.1mg
0
Front-end Loader Operator
2018-03-21
Nuisance dust, total, <1% Qtz
1.52
10
0.15
Scale Man
2018-03-21
Nuisance dust, total, <1% Qtz
7.27
10
0.73
Kiln/Dryer Operator
2018-03-21
Nuisance dust, total, <1% Qtz
3.11
10
0.31
Kiln/Dryer Operator
2017-09-20
Nuisance dust, total, <1% Qtz
3.02
10
0.30
Dry Screen Plant Operator
2017-09-20
Nuisance dust, total, <1% Qtz
0.76
10
0.08
Front-end Loader Operator
2017-09-20
Nuisance dust, total, <1% Qtz
1.15
10
0.12
Mechanic
2012-05-08
Nuisance dust, total, <1% Qtz
7.52
10
0.75
Crusher Oper/Worker
2012-05-08
Nuisance dust, total, <1% Qtz
9.44
10
0.94
Bagging Operator
2011-10-13
Nuisance dust, respirable, <1% Qtz
0.31
10
0.03
Kiln/Dryer Operator
2011-10-13
Nuisance dust, respirable, <1% Qtz
0.2
10
0.02
Mechanic
2011-02-03
Nuisance dust, respirable, <1% Qtz
0.53
10
0.05
Bagging Operator
2011-02-03
Nuisance dust, respirable, <1% Qtz
1.21
10
0.12
Kiln/Dryer Operator
2010-03-03
Nuisance dust, total, <1% Qtz
0.83
10
0.08
Hammer Mill Operator
2010-03-03
Nuisance dust, respirable, <1% Qtz
0.16
10
0.02
Hammer Mill Operator
2010-03-03
Nuisance dust, total, <1% Qtz
1.49
10
0.15
Bagging Operator
2009-06-16
Nuisance dust, total, <1% Qtz
1.91
10
0.19
Crusher Oper/Worker
2009-06-16
Nuisance dust, total, <1% Qtz
3.34
10
0.33
Crusher Oper/Worker
2004-11-23
Nuisance dust, respirable, <1% Qtz
0.84
10
0.08
Crusher Oper/Worker
2004-11-23
Nuisance dust, respirable, <1% Qtz
0.58
10
0.06
Crusher Oper/Worker
2003-01-02
Nuisance dust, respirable, <1% Qtz
0.98
10
0.10
Crusher Oper/Worker
2003-01-02
Nuisance dust, respirable, <1% Qtz
0.72
10
0.07
Crusher Oper/Worker
2003-01-02
Nuisance dust, respirable, <1% Qtz
0.74
10
0.07
Bagging 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.
Cerne Calcium Co., LLC recorded 0.00 reportable injury cases per 100 full-time workers in 2025.
Injury rate, 2025
ⓘ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 1.65 and the all-US-mining average was 1.97 cases per 100 workers.
In Iowa, metal and nonmetal mining averaged 1.72 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
2025 *
0.00
0.00
0.000
2024 *
0.00
0.00
0.000
2023 *
0.00
0.00
0.000
2022 *
0.00
0.00
0.000
2021 *
0.00
0.00
0.000
2020 *
0.00
0.00
0.000
2019 *
0.00
0.00
0.000
2018 *
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
12
2025
12
2024
12
2023
12
2022
12
2021
12
2020
12
2019
12
2018
12
2017
11
2016
11
2015
11
2014
11
2013
10
2012
10
2011
9
2010
10
2009
10
2008
10
2007
10
2006
11
2005
9
2004
10
2003
9
2002
9
2001
9
2000
9
Source: MSHA quarterly employment and production, updated weekly.
Cerne Calcium Co., LLC sits in Webster County, Iowa, where the Census mining category is 0.6% 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.
Webster County, Iowa · Population 36,848
0.6%
Mining share of county employment
$68,054
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
7,300
0
0
0.0
2026 Q1
6,770
0
0
0.0
2025 Q4
7,200
0
0
0.0
2025 Q3
6,920
2
0
289.0
2025 Q2
6,620
0
0
0.0
2025 Q1
6,465
1
0
154.7
2024 Q4
6,945
0
0
0.0
2024 Q3
6,959
0
0
0.0
Show 98 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2024 Q2
6,510
1
0
153.6
2024 Q1
6,678
1
0
149.7
2023 Q4
6,602
0
0
0.0
2023 Q3
7,023
6
2
854.3
2023 Q2
6,509
0
0
0.0
2023 Q1
6,743
3
0
444.9
2022 Q4
6,716
0
0
0.0
2022 Q3
7,115
7
0
983.8
2022 Q2
6,363
0
0
0.0
2022 Q1
6,901
0
0
0.0
2021 Q4
6,459
1
0
154.8
2021 Q3
7,230
0
0
0.0
2021 Q2
6,256
1
0
159.8
2021 Q1
6,703
2
0
298.4
2020 Q4
6,335
0
0
0.0
2020 Q3
7,034
1
0
142.2
2020 Q2
6,194
0
0
0.0
2020 Q1
6,657
1
0
150.2
2019 Q4
6,205
0
0
0.0
2019 Q3
6,874
0
0
0.0
2019 Q2
6,345
0
0
0.0
2019 Q1
6,736
4
1
593.8
2018 Q4
6,141
2
1
325.7
2018 Q3
7,089
0
0
0.0
2018 Q2
6,370
3
0
471.0
2018 Q1
6,370
4
0
627.9
2017 Q4
6,167
0
0
0.0
2017 Q3
6,655
10
2
1502.6
2017 Q2
6,182
0
0
0.0
2017 Q1
5,742
4
1
696.6
2016 Q4
6,112
0
0
0.0
2016 Q3
6,460
10
3
1548.0
2016 Q2
6,056
0
0
0.0
2016 Q1
5,832
0
0
0.0
2015 Q4
6,160
5
1
811.7
2015 Q3
6,542
1
0
152.9
2015 Q2
6,400
0
0
0.0
2015 Q1
6,096
0
0
0.0
2014 Q4
5,612
2
1
356.4
2014 Q3
5,976
0
0
0.0
2014 Q2
5,762
11
2
1909.1
2014 Q1
5,582
16
3
2866.4
2013 Q4
4,650
6
1
1290.3
2013 Q3
5,149
0
0
0.0
2013 Q2
5,942
5
0
841.5
2013 Q1
4,886
0
0
0.0
2012 Q4
5,036
5
2
992.9
2012 Q3
4,835
0
0
0.0
2012 Q2
4,829
6
3
1242.5
2012 Q1
4,830
0
0
0.0
2011 Q4
4,531
7
1
1544.9
2011 Q3
4,788
4
1
835.4
2011 Q2
4,637
0
0
0.0
2011 Q1
5,904
2
1
338.8
2010 Q4
5,581
0
0
0.0
2010 Q3
5,093
0
0
0.0
2010 Q2
5,384
0
0
0.0
2010 Q1
5,637
1
0
177.4
2009 Q4
5,895
0
0
0.0
2009 Q3
4,999
0
0
0.0
2009 Q2
4,629
4
0
864.1
2009 Q1
5,784
5
0
864.5
2008 Q4
6,062
0
0
0.0
2008 Q3
5,302
0
0
0.0
2008 Q2
4,854
3
0
618.0
2008 Q1
5,276
5
0
947.7
2007 Q4
5,180
0
0
0.0
2007 Q3
5,093
2
0
392.7
2007 Q2
4,864
0
0
0.0
2007 Q1
5,856
7
1
1195.4
2006 Q4
5,911
0
0
0.0
2006 Q3
5,497
1
0
181.9
2006 Q2
5,718
0
0
0.0
2006 Q1
6,005
4
2
666.1
2005 Q4
5,066
0
0
0.0
2005 Q3
4,972
5
0
1005.6
2005 Q2
4,902
0
0
0.0
2005 Q1
4,788
0
0
0.0
2004 Q4
4,796
1
0
208.5
2004 Q3
4,659
0
0
0.0
2004 Q2
4,993
0
0
0.0
2004 Q1
4,956
0
0
0.0
2003 Q4
5,030
3
0
596.4
2003 Q3
4,344
0
0
0.0
2003 Q2
4,587
0
0
0.0
2003 Q1
4,063
0
0
0.0
2002 Q4
4,611
2
0
433.7
2002 Q3
4,163
0
0
0.0
2002 Q2
4,791
6
0
1252.3
2002 Q1
4,144
0
0
0.0
2001 Q4
4,578
2
0
436.9
2001 Q3
4,156
0
0
0.0
2001 Q2
4,799
3
0
625.1
2001 Q1
4,353
0
0
0.0
2000 Q4
4,804
2
0
416.3
2000 Q3
3,954
3
0
758.7
2000 Q2
4,947
0
0
0.0
2000 Q1
4,295
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
8 on file
2024 · 1 incident
July 12, 2024IA · Metal/Non-Metalmaintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service techSLIP OR FALL OF PERSON
Coming down ladder on 972M wheel loader and missed bottom step and right knee twisted and didn't start to hurt till that afternoon. Technician was not using three points of contact.
2008 · 1 incident
November 26, 2008IA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON
UNKNOWN - POSSIBLE ILLNESS RELATED TO NATURAL CAUSES. PENDING DOCTOR'S DIAGNOSIS.
1999 · 1 incident
March 11, 1999IA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorOTHER
J M Huber Corp · Over-exertion (Not Elsewhere Classified)
EMPLOYEE SOUGHT TREATMENT FOR A NON WORK RELATEDBACK INJURY. AFTER EMPLOYEE GOT MEDICAL TREATMENT THE EMPLOYEE CHANGED THE INJURY FROM NON-WORK RELATED BACK INJURY TO A WORK RELATED INJURY. THE EMPLOYEE COULD NOT RELATE ANY ACTION OR CAUSE FOR THE ALLEGED INJURY. NOR COULD THE EMPLOYEE GIVE A TIME FOR THIS INJURY TO OCCUR OTHER THAN TO STATE THAT IT HAPPENED DAY BEFORE.
1993 · 1 incident
December 16, 1993IA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDTOOLS (NONPOWERED)
JOEL WAS USING A 2 LB. HAMMER TO BREAK LOOSE THE OUTSIDE SHOES OF THE CRUSHER WHEN A PIECE OF THE HAMMER HEAD BROKE & STRUCK HIM IN THE MIDDLE OF THE FOREHEAD. ON 12-20-93 JOEL REPORTED THAT A PIECE OF METAL MIGHT STILL BE STUCK IN HIS FOREHEAD.
1989 · 1 incident
April 12, 1989IA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
J M Huber Corp · Over-exertion (Not Elsewhere Classified)
HE WAS BAGGING AND LOADING PALLETS WITH BAGS, WHEN HE OVER EXTNDED WHILE PLACING BAGS ON PALLET.
1984 · 1 incident
November 21, 1984IA · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorSLIP OR FALL OF PERSON