MENCENBERG QUARRY has $81K 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
11
Years on record
1998–2015
Latest incident
Jul 2015
Compliance record
MSHA citations since 2000
144
citations
38
significant & substantial
$80,774
proposed penalties
$80,424
paid to date
100% of proposed penalties paid to date, a $350 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: 677 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.
1
Section 107(a) orders
Most recent order: 2016-12-27.
On record since 2016.
Source: MSHA imminent-danger order records, updated weekly.
MENCENBERG QUARRY has $81K 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.
$81K
proposed penalties
$80K
current assessed
$80K
paid to date
$0
outstanding
143 assessments are final orders; 1 contested dockets.
Of $900 in penalties contested before the Commission, $550 was upheld in final decisions.
As of the most recent assessment on 2025-11-04.
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 · 1% 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%
39%
Penalty reduction in decided contests
$900 proposed, $550 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 2005-09-13.
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: 2019-12-27, 6 years ago
0%
of limit-tested samples over the exposure limit
12
samples
2
limit-tested
Most sampled contaminants
Unlisted Particulate, respirable, <1% Qtz6
Quartz, respirable, >1% Qtz3
Respirable dust, <.1mg3
Show the individual readings (12)
Date
Contaminant
Concentration
Limit
Conc / limit
Occupation
2019-12-27
Unlisted Particulate, respirable, <1% Qtz
0.52
Front-end Loader Operator
2019-12-27
Quartz, respirable, >1% Qtz
0.36
Welder, etc.
2019-12-27
Unlisted Particulate, respirable, <1% Qtz
0.37
Laborer, Bullgang
2019-12-27
Unlisted Particulate, respirable, <1% Qtz
0.34
Front-end Loader Operator
2017-06-13
Unlisted Particulate, respirable, <1% Qtz
0.3
Front-end Loader Operator
2017-06-13
Respirable dust, <.1mg
0
Front-end Loader Operator
2014-08-13
Unlisted Particulate, respirable, <1% Qtz
0.56
Crusher Oper/Worker
2012-07-26
Quartz, respirable, >1% Qtz
0.43
1.1
0.39
Front-end Loader Operator
2012-07-26
Unlisted Particulate, respirable, <1% Qtz
0.44
Crusher Oper/Worker
2005-08-25
Respirable dust, <.1mg
0
Front-end Loader Operator
2005-08-25
Respirable dust, <.1mg
0
Backhoe Operator
2001-10-25
Quartz, respirable, >1% Qtz
0.24
2.22
0.11
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
3
2025
3
2023
0
2022
2
2021
7
2020
7
2019
5
2018
5
2017
5
2016
5
2015
5
2014
5
2013
4
2012
3
2011
4
2010
3
2009
4
2008
5
2007
6
2006
6
2005
5
2004
4
2003
4
2002
5
2001
7
2000
7
Source: MSHA quarterly employment and production, updated weekly.
MENCENBERG QUARRY sits in Douglas County, Colorado, 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.
Douglas County, Colorado · Population 368,283
0.6%
Mining share of county employment
$145,737
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
60
0
0
0.0
2026 Q1
92
0
0
0.0
2025 Q4
257
2
0
7782.1
2025 Q3
370
0
0
0.0
2023 Q3
0
0
0
2023 Q2
0
0
0
2023 Q1
0
0
0
2022 Q4
0
0
0
Show 91 earlier quartersHide earlier quarters
Quarter
Hours worked
Citations
S&S
Per 1M hrs
2022 Q3
0
0
0
2022 Q2
1,224
0
0
0.0
2022 Q1
3,276
0
0
0.0
2021 Q4
3,416
4
0
1171.0
2021 Q3
4,247
0
0
0.0
2021 Q2
3,571
1
0
280.0
2021 Q1
3,217
0
0
0.0
2020 Q4
3,319
8
3
2410.4
2020 Q3
4,214
0
0
0.0
2020 Q2
4,629
9
3
1944.3
2020 Q1
4,637
0
0
0.0
2019 Q4
4,440
1
0
225.2
2019 Q3
4,680
1
0
213.7
2019 Q2
3,632
0
0
0.0
2019 Q1
2,499
0
0
0.0
2018 Q4
2,966
0
0
0.0
2018 Q3
3,419
1
0
292.5
2018 Q2
4,152
0
0
0.0
2018 Q1
3,197
0
0
0.0
2017 Q4
3,384
2
0
591.0
2017 Q3
3,606
0
0
0.0
2017 Q2
3,252
6
2
1845.0
2017 Q1
2,973
0
0
0.0
2016 Q4
3,107
8
4
2574.8
2016 Q3
3,403
0
0
0.0
2016 Q2
2,974
11
4
3698.7
2016 Q1
3,331
7
1
2101.5
2015 Q4
1,891
0
0
0.0
2015 Q3
3,524
0
0
0.0
2015 Q2
3,467
15
5
4326.5
2015 Q1
2,363
0
0
0.0
2014 Q4
2,662
0
0
0.0
2014 Q3
3,080
1
0
324.7
2014 Q2
2,780
0
0
0.0
2014 Q1
2,574
2
0
777.0
2013 Q4
2,936
0
0
0.0
2013 Q3
2,620
0
0
0.0
2013 Q2
1,878
2
1
1065.0
2013 Q1
1,889
3
0
1588.1
2012 Q4
1,873
0
0
0.0
2012 Q3
1,793
0
0
0.0
2012 Q2
1,124
0
0
0.0
2012 Q1
1,276
0
0
0.0
2011 Q4
1,945
0
0
0.0
2011 Q3
1,723
0
0
0.0
2011 Q2
1,510
0
0
0.0
2011 Q1
1,384
2
0
1445.1
2010 Q4
1,253
0
0
0.0
2010 Q3
1,459
0
0
0.0
2010 Q2
1,480
0
0
0.0
2010 Q1
1,502
0
0
0.0
2009 Q4
1,476
0
0
0.0
2009 Q3
2,419
0
0
0.0
2009 Q2
1,468
3
0
2043.6
2009 Q1
608
0
0
0.0
2008 Q4
2,068
2
0
967.1
2008 Q3
2,915
0
0
0.0
2008 Q2
3,224
2
0
620.3
2008 Q1
2,787
2
0
717.6
2007 Q4
4,386
0
0
0.0
2007 Q3
3,509
8
4
2279.9
2007 Q2
3,757
0
0
0.0
2007 Q1
3,230
0
0
0.0
2006 Q4
3,519
0
0
0.0
2006 Q3
2,813
0
0
0.0
2006 Q2
3,241
0
0
0.0
2006 Q1
3,226
5
2
1549.9
2005 Q4
3,059
0
0
0.0
2005 Q3
3,149
6
0
1905.4
2005 Q2
3,416
0
0
0.0
2005 Q1
2,628
0
0
0.0
2004 Q4
2,691
0
0
0.0
2004 Q3
2,906
0
0
0.0
2004 Q2
2,569
0
0
0.0
2004 Q1
2,120
14
6
6603.8
2003 Q4
2,740
0
0
0.0
2003 Q3
2,428
3
0
1235.6
2003 Q2
1,474
0
0
0.0
2003 Q1
1,568
1
0
637.8
2002 Q4
2,357
4
1
1697.1
2002 Q3
1,855
0
0
0.0
2002 Q2
2,885
0
0
0.0
2002 Q1
3,525
0
0
0.0
2001 Q4
3,864
2
0
517.6
2001 Q3
3,686
0
0
0.0
2001 Q2
3,836
0
0
0.0
2001 Q1
5,712
0
0
0.0
2000 Q4
3,722
0
0
0.0
2000 Q3
4,455
0
0
0.0
2000 Q2
4,560
4
1
877.2
2000 Q1
3,582
0
0
0.0
No fatalities recorded at this mine.
Reportable incidents
11 on file
2015 · 1 incident
July 7, 2015CO · Metal/Non-Metallaborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitmanHANDLING OF MATERIALS
EMPLOYEE SLIPPED GETTING DOWN FROM LOADER & FELL BACKWARDS, HITTING HIS HEAD ON THE TIRE OF ANOTHER PARKER LOADER.
February 26, 2002CO · Metal/Non-Metalfront-end loader, scraper-loader operator, pan operator, payloader, scraper rig operatorSTEPPING OR KNEELING ON OBJECT
EE IS A STONE CUTTER. IN SPLITTING A ROCK, 1/2 OF PIECE FELL ON EMPLOYEE'S LEG, INJURING THE KNEE.
May 3, 2000CO · Metal/Non-Metalwarehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operatorHANDLING OF MATERIALS
Schmidt Aggregates · Caught in, under or between (Not Elsewhere Classified)
EE WAS HELPING TO CHANGE OUT SCREENS WHEN THE TOP SCREEN SLIPPED, CAUSING HIS LEFT THUMB TO BE PINCHED.. THE DR. PLACED HIM ON RESTRICTED DUTY UNTIL THE NEXT VISIT.
1998 · 3 incidents
December 9, 1998CO · Metal/Non-Metalbulldozer operator, universal operator, heavy equipment operator, operating engineerDISORDERS (REPEATED TRAUMA)
THE EE REPORTED THAT WHEN HE REMOVED HIS EARPLUGS AT THE END OF HIS SHIFT HE NOTICED A LOSS OF HEARING IN HIS LEFT EAR. THE EE OPERATES A CAT LOADER WITH A SOUNDPROOF CAB AND IS REQUIRED TO WE AR EARPLUGS DURING OPERATION.