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Centennial Quarry: 45 MSHA citations Metal/Non-Metal

Controlled by Colas S A
Whitewood, Lawrence County, SD  ·  Intermittent
MSHA Mine ID: 3901246

Centennial Quarry has $6K in proposed MSHA penalties and $0 outstanding across 6 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
16
Years on record
1988–2016
Latest incident
Jun 2016
Compliance record
MSHA citations since 2002
45
citations
2
significant & substantial
$6,322
proposed penalties
$6,162
paid to date
97% of proposed penalties paid to date, a $160 gap.
Source: MSHA violations data, updated weekly.
See Simon Contractors Inc.'s full MSHA compliance history →
Inspection activity
MSHA inspections since 2000
58
inspections on record
669
inspection hours
n/a
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: 669 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Centennial Quarry has $6K in proposed MSHA penalties and $0 outstanding across 6 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.
$6K
proposed penalties
$6K
current assessed
$6K
paid to date
$0
outstanding
45 assessments are final orders; 6 contested dockets.
Of $3K in penalties contested before the Commission, $2K was upheld in final decisions.
As of the most recent assessment on 2025-07-29.
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.
4.4%
significant & substantial
6.7%
high negligence or reckless
4.4%
reasonably likely or greater
62.2%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 22.2% low, 71.1% moderate, 6.7% high, 0.0% reckless.
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.
16 citations taken to the federal commission · 36% of citations on record
  • Settled 12 · 75%
  • Stood as issued 2 · 13%
  • Vacated or withdrawn 2 · 13%
50%
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 4 decided S&S contests · industry: 79%
20%
Penalty reduction in decided contests
$3K proposed, $2K 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 2025-01-19.
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.
Docket Decision Judge Year Proposed / upheld
CENT 2009-844M Settlement Manning 2010 $1K → $1K
CENT 2021-0080 Settlement Simonton 2021 $492 → $492
CENT 2014-61M Settlement Moran 2014 $451 → $200
CENT 2010-35M Settlement 2010 $293 → $100
CENT 2025-0126 Dismissal McCarthy 2025 $147 → $147
CENT 2006-173M Dismissal Manning 2006 $60 → $0
Source: FMSHRC civil penalty dockets and decisions (public record), updated weekly.
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: 2025-07-29
0%
of limit-tested samples over the exposure limit
14
samples
3
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg7
  • Quartz, respirable, >1% Qtz4
  • Unlisted Particulate, respirable, <1% Qtz3
Show the individual readings (14)
Date Contaminant Concentration Limit Conc / limit Occupation
2025-07-29 Respirable dust, <.1mg 0 Front-end Loader Operator
2025-07-29 Respirable dust, <.1mg 0 Utility Man
2023-10-11 Respirable dust, <.1mg 0 Backhoe Operator
2023-10-11 Respirable dust, <.1mg 0 Front-end Loader Operator
2021-04-14 Unlisted Particulate, respirable, <1% Qtz 0.15 Front-end Loader Operator
2021-04-14 Quartz, respirable, >1% Qtz 0.85 Crusher Oper/Worker
2011-03-16 Respirable dust, <.1mg 0 Front-end Loader Operator
2005-03-01 Quartz, respirable, >1% Qtz 0.47 2.81 0.17 Drill Operator, Rotary
2005-03-01 Unlisted Particulate, respirable, <1% Qtz 0.22 Laborer, Bullgang
2005-03-01 Quartz, respirable, >1% Qtz 0.38 2.06 0.18 Crusher Oper/Worker
2005-03-01 Quartz, respirable, >1% Qtz 0.78 2.01 0.39 Scraper Operator
2004-09-08 Unlisted Particulate, respirable, <1% Qtz 0.28 Cleanup Man
2004-09-08 Respirable dust, <.1mg 0 Front-end Loader Operator
2004-09-08 Respirable dust, <.1mg 0 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.
Ownership history
  1. Hills Materials Company 1981 to 1998
  2. Hills Materials Company 1998 to 2015
  3. Simon Contractors Inc. 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 8
2025 6
2024 5
2023 7
2022 7
2021 10
2020 8
2019 4
2018 6
2017 7
2016 9
2015 11
2014 3
2013 5
2012 5
2011 6
2010 5
2009 6
2008 8
2007 6
2006 8
2005 9
2004 7
2003 6
2002 6
2001 6
2000 7
Source: MSHA quarterly employment and production, updated weekly.

Centennial Quarry sits in Lawrence County, South Dakota, where the Census mining category is 2.1% 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.
Lawrence County, South Dakota · Population 26,574
2.1%
Mining share of county employment
$66,766
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 2,348 0 0 0.0
2026 Q1 1,801 0 0 0.0
2025 Q4 3,284 0 0 0.0
2025 Q3 2,619 1 0 381.8
2025 Q2 2,497 0 0 0.0
2025 Q1 1,755 0 0 0.0
2024 Q4 2,120 0 0 0.0
2024 Q3 1,934 0 0 0.0
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 2,821 1 0 354.5
2024 Q1 1,934 0 0 0.0
2023 Q4 2,847 0 0 0.0
2023 Q3 3,627 7 0 1930.0
2023 Q2 3,615 0 0 0.0
2023 Q1 3,845 0 0 0.0
2022 Q4 3,769 0 0 0.0
2022 Q3 4,409 0 0 0.0
2022 Q2 3,352 1 0 298.3
2022 Q1 2,053 1 0 487.1
2021 Q4 3,909 0 0 0.0
2021 Q3 6,376 0 0 0.0
2021 Q2 5,649 5 0 885.1
2021 Q1 4,037 0 0 0.0
2020 Q4 4,712 8 0 1697.8
2020 Q3 5,962 0 0 0.0
2020 Q2 3,986 0 0 0.0
2020 Q1 1,707 0 0 0.0
2019 Q4 1,722 0 0 0.0
2019 Q3 2,009 0 0 0.0
2019 Q2 2,336 0 0 0.0
2019 Q1 1,106 0 0 0.0
2018 Q4 1,664 0 0 0.0
2018 Q3 3,182 0 0 0.0
2018 Q2 3,090 0 0 0.0
2018 Q1 1,568 3 0 1913.3
2017 Q4 2,568 0 0 0.0
2017 Q3 5,078 0 0 0.0
2017 Q2 5,398 0 0 0.0
2017 Q1 1,994 1 0 501.5
2016 Q4 3,324 0 0 0.0
2016 Q3 7,060 0 0 0.0
2016 Q2 6,082 2 0 328.8
2016 Q1 2,067 0 0 0.0
2015 Q4 2,716 0 0 0.0
2015 Q3 6,488 0 0 0.0
2015 Q2 3,736 1 0 267.7
2015 Q1 2,502 0 0 0.0
2014 Q4 0 0 0
2014 Q3 0 0 0
2014 Q2 4,414 0 0 0.0
2014 Q1 981 0 0 0.0
2013 Q4 2,395 0 0 0.0
2013 Q3 4,134 3 0 725.7
2013 Q2 0 0 0
2013 Q1 2,675 0 0 0.0
2012 Q4 1,241 0 0 0.0
2012 Q3 3,078 0 0 0.0
2012 Q2 347 0 0 0.0
2012 Q1 1,023 0 0 0.0
2011 Q4 354 0 0 0.0
2011 Q3 3,061 0 0 0.0
2011 Q2 2,704 0 0 0.0
2011 Q1 417 0 0 0.0
2010 Q2 0 0 0
2010 Q1 289 0 0 0.0
2009 Q4 970 0 0 0.0
2009 Q3 1,940 6 2 3092.8
2009 Q2 3,425 0 0 0.0
2009 Q1 1,447 0 0 0.0
2008 Q4 2,854 1 0 350.4
2008 Q3 3,275 0 0 0.0
2008 Q2 2,567 0 0 0.0
2008 Q1 4,841 0 0 0.0
2007 Q4 3,478 0 0 0.0
2007 Q3 3,253 0 0 0.0
2007 Q2 2,674 0 0 0.0
2007 Q1 2,778 0 0 0.0
2006 Q4 3,305 0 0 0.0
2006 Q3 5,777 0 0 0.0
2006 Q2 5,195 0 0 0.0
2006 Q1 4,729 0 0 0.0
2005 Q4 3,590 0 0 0.0
2005 Q3 3,939 0 0 0.0
2005 Q2 3,724 0 0 0.0
2005 Q1 6,005 1 0 166.5
2004 Q4 3,499 0 0 0.0
2004 Q3 2,942 0 0 0.0
2004 Q2 3,349 0 0 0.0
2004 Q1 2,663 0 0 0.0
2003 Q4 2,206 0 0 0.0
2003 Q3 2,406 0 0 0.0
2003 Q2 3,384 0 0 0.0
2003 Q1 3,608 0 0 0.0
2002 Q4 3,540 0 0 0.0
2002 Q3 4,040 1 0 247.5
2002 Q2 4,648 0 0 0.0
2002 Q1 4,002 2 0 499.8
2001 Q4 3,228 0 0 0.0
2001 Q3 1,689 0 0 0.0
2001 Q2 1,270 0 0 0.0
2001 Q1 1,610 0 0 0.0
2000 Q4 3,589 0 0 0.0
2000 Q3 4,362 0 0 0.0
2000 Q2 3,975 0 0 0.0
2000 Q1 4,758 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

16 on file

2016 · 1 incident

June 16, 2016 SD · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER
Simon Contractors Inc. · Absorption of radiations, caustics, toxic and noxious substances

Employee was stung by a bee while working. Employee was unaware that they were allergic. Epi Pen prescribed.

2006 · 1 incident

August 14, 2006 SD · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Hills Materials Company · Over-exertion (Not Elsewhere Classified)

Employee strained lower back while cleaning the flywheel on the shorthead cone of a portable crusher. Employee said he was OK and finished his shift. The following day he went to a doctor and was taken off work for one day and returned to work on Aug 16, 2006. Doctor diagnosed the injury as a simple muscle spasm.

2004 · 1 incident

August 20, 2004 SD · Metal/Non-Metal water truck operator HANDLING OF MATERIALS
Hills Materials Company · Over-exertion (Not Elsewhere Classified)

Individual was moving a 55 Gl. drum and loss control of the drum causing a shoulder strain.

1998 · 1 incident

1996 · 1 incident

April 22, 1996 SD · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
Hills Materials Company · Struck by... (Not Elsewhere Classified)

EMPLOYEE DROVE DUMP TRUCK UNDER STACKING CONVEYOR WITH THE BOX UP. THE BOX HIT THE CONVEYOR CAUSING IT TO TIP OVER ON THE CAB OF THE TRUCK. EMPLOYEE RECEIVED A CUT ON THE LIP.

1995 · 3 incidents

September 19, 1995 SD · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator MACHINERY
Hills Materials Company · Struck by... (Not Elsewhere Classified)

EE USING GRINDER WITH WIRE WHEEL ATTACHMENT WITH SAFETY GLASSES TO TAKE RUST OFF CONE CRUSHER. SOME RUST DUST GOT IN EE'S EYES.

January 31, 1995 SD · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hills Materials Company · Over-exertion in pulling or pushing objects

EMPLOYEE CLEANING 1" TO 8" ROCK OFF CLOGGED CONVEYOR. FELT OSMETHING PULL IN STOMACH. DR DIAGNOSED AS VENTRAL HERNIA.

1994 · 1 incident

November 2, 1994 SD · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler HANDLING OF MATERIALS
Hills Materials Company · Struck by... (Not Elsewhere Classified)

EMPLOYEE DOING CLEAN UP WORK- HE GOT DUST IN HIS EYE.

1992 · 1 incident

August 20, 1992 SD · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
Hills Materials Company · Struck by falling object

54736YEE WELDING WORN AREA IN HOPPER ON CONVEYOR A ROCK FELL FROM THE HEAD PULLEY STRIKING EMPLOYEE IN THE FOREHEAD

1991 · 1 incident

November 11, 1991 SD · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
Hills Materials Company · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS REMOVING WEDGE PLATE WEIGHTS ON 54" ROLLER CONE. THE WEIGHT SLIPPED, CUTTING THE EMPLOYEE'S FINGER.

1989 · 3 incidents

October 18, 1989 SD · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler SLIP OR FALL OF PERSON
Hills Materials Company · Fall to lower level, (Not Elsewhere Classified)

WALKING DOWN GRAVEL STOCKPILE. THOUGHT PILE WAS FROZEN LEG FELL THROUGH FROZEN LAYER OF GRAVEL AND TWISTED KNEE

February 24, 1989 SD · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
Hills Materials Company · Struck against stationary object

EMPLOYEE CLEANING GRIZZLY FEEDER ON JAW CRUSHER. WAS SLIDING HAND ON APRON FEEDER AND HE GOT A PUNCTURE WOUND TO HIS RIGHT HAND.

January 12, 1989 SD · Metal/Non-Metal outside foreman, leadman POWERED HAULAGE
Hills Materials Company · Fall from machine

THE CONVEYOR BELT BECAME JAMMED BECAUSE OF LARGE CHUNKS OF FROZEN CLAY. EMPLOYEE PICKING LARGE CHUNKS OFF CONVEYOR BELT IN AN EFFORT TO FREE CONVEYOR BELT. THE CONVEYOR BELT STARTED UNEXCPECTE DLY WHICH CAUSED EMPLOYEE TO FALL APPROX. 6'5". INJURIES TO EMPLOYEE INCLUDE SMALL CUT OVER EYE, ABRASIONS TO FACE, AND BRUISED RIBS.

1988 · 2 incidents

February 22, 1988 SD · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDTOOLS (NONPOWERED)
Hills Materials Company · Over-exertion (Not Elsewhere Classified)

EMPL PRYING ROCK STUCK IN TRAP TO FEEDER CONVEYOR.PULLED MUSCLE IN RIGHT ARM POSSIBLE NERVE DAMAGE.

February 4, 1988 SD · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator POWERED HAULAGE
Hills Materials Company · Struck by flying object

EMPL RUNNING BOBCAT CLEANING UP CRUSHING SPREAD NOT REPORTED TO MSHA