Mining Incidents

American Stone Quarry: 85 MSHA citations Metal/Non-Metal

Chapel Hill, Orange County, NC  ·  Active
MSHA Mine ID: 3100189

American Stone Quarry has $12K 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
20
Years on record
1983–2016
Latest incident
Jul 2016
Compliance record
MSHA citations since 2000
85
citations
17
significant & substantial
$12,258
proposed penalties
$12,258
paid to date
100% of proposed penalties paid to date, a $0 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
83
inspections on record
1,146
inspection hours
7.4
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.
85 citations across 1,146 inspection hours.
Source: MSHA inspections data, updated weekly.

American Stone Quarry has $12K 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.
$12K
proposed penalties
$12K
current assessed
$12K
paid to date
$0
outstanding
83 assessments are final orders; 1 contested dockets.
Of $120 in penalties contested before the Commission, $120 was upheld in final decisions.
As of the most recent assessment on 2025-07-14.
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.
20.2%
significant & substantial
9.5%
high negligence or reckless
20.2%
reasonably likely or greater
47.6%
permanently disabling or fatal if injury occurs
Negligence coding: 0.0% none, 6.0% low, 84.5% moderate, 9.5% 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.
2 citations taken to the federal commission · 2% of citations on record
  • Settled 2 · 100%
0%
Penalty reduction in decided contests
$120 proposed, $120 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 2007-05-09.
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
SE 2007-256M Settlement Bulluck 2007 $120 → $120
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: 2024-08-21
0%
of limit-tested samples over the exposure limit
30
samples
8
limit-tested
Most sampled contaminants
  • Respirable dust, <.1mg16
  • Quartz, respirable, >1% Qtz10
  • Unlisted Particulate, respirable, <1% Qtz4
Show the individual readings (30)
Date Contaminant Concentration Limit Conc / limit Occupation
2024-08-21 Respirable dust, <.1mg 0 Truck Driver
2024-08-21 Respirable dust, <.1mg 0 Utility Man
2024-08-21 Respirable dust, <.1mg 0 Front-end Loader Operator
2024-08-21 Unlisted Particulate, respirable, <1% Qtz 0.15 Crusher Oper/Worker
2024-08-21 Respirable dust, <.1mg 0 Front-end Loader Operator
2023-09-26 Respirable dust, <.1mg 0 Lab Technician
2023-09-26 Respirable dust, <.1mg 0 Utility Man
2021-09-09 Quartz, respirable, >1% Qtz 0.37 0.65 0.57 Lab Technician
2021-09-09 Respirable dust, <.1mg 0 Welder, etc.
2021-09-09 Respirable dust, <.1mg 0 Crusher Oper/Worker
2021-09-09 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-04-11 Quartz, respirable, >1% Qtz 0.33 Utility Man
2019-04-11 Unlisted Particulate, respirable, <1% Qtz 0.2 Washer Operator
2019-04-11 Quartz, respirable, >1% Qtz 0.5 Crusher Oper/Worker
2019-04-11 Respirable dust, <.1mg 0 Front-end Loader Operator
2019-04-11 Respirable dust, <.1mg 0 Truck Driver
2016-04-26 Respirable dust, <.1mg 0 Front-end Loader Operator
2016-04-26 Quartz, respirable, >1% Qtz 0.15 1.45 0.10 Crusher Oper/Worker
2016-04-26 Respirable dust, <.1mg 0 Backhoe Operator
2016-04-26 Quartz, respirable, >1% Qtz 0.28 2.18 0.13 Truck Driver
2016-04-26 Respirable dust, <.1mg 0 Front-end Loader Operator
2011-05-04 Unlisted Particulate, respirable, <1% Qtz 1.21 Drill Operator, Rotary
2011-05-04 Respirable dust, <.1mg 0 Front-end Loader Operator
2011-05-04 Respirable dust, <.1mg 0 Utility Man
2006-09-14 Quartz, respirable, >1% Qtz 0.43 0.75 0.57 Crusher Oper/Worker
2003-06-25 Quartz, respirable, >1% Qtz 0.26 0.94 0.28 Lab Technician
2003-06-25 Quartz, respirable, >1% Qtz 0.54 1.09 0.50 Crusher Oper/Worker
2003-06-25 Unlisted Particulate, respirable, <1% Qtz 0.53 Washer Operator
2003-06-25 Quartz, respirable, >1% Qtz 0.42 1.32 0.32 Utility Man
2003-06-25 Quartz, respirable, >1% Qtz 0.25 2.04 0.12 Drill Operator, Rotary
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.

American Stone Quarry recorded 0.00 reportable injury cases per 100 full-time workers in 2009.

Injury rate, 2009
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 2.82 and the all-US-mining average was 3.36 cases per 100 workers.
In North Carolina, metal and nonmetal mining averaged 2.04 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
2009 * 0.00 0.00 0.000
2008 * 0.00 0.00 0.000
2007 * 0.00 0.00 0.000
2006 * 0.00 0.00 0.000
2005 * 0.00 0.00 0.000
2004 * 6.29 6.29 0.000
2003 * 0.00 0.00 0.000
2002 * 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.
Ownership history
  1. American Stone Company 1950 to 2005
  2. Martin Marietta Materials Inc 2005 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 9
2025 7
2024 3
2023 3
2022 4
2021 10
2020 9
2019 6
2018 8
2017 8
2016 7
2015 7
2014 8
2013 9
2012 11
2011 11
2010 11
2009 11
2008 12
2007 15
2006 16
2005 17
2004 17
2003 18
2002 18
2001 18
2000 19
Source: MSHA quarterly employment and production, updated weekly.

American Stone Quarry sits in Orange County, North Carolina, 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.
Orange County, North Carolina · Population 147,292
0.0%
Mining share of county employment
$88,553
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 1,904 0 0 0.0
2026 Q1 5,531 0 0 0.0
2025 Q4 2,689 0 0 0.0
2025 Q3 3,784 1 0 264.3
2025 Q2 844 0 0 0.0
2025 Q1 4,007 0 0 0.0
2024 Q4 920 0 0 0.0
2024 Q3 1,018 0 0 0.0
Show 98 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q2 1,227 0 0 0.0
2024 Q1 1,147 0 0 0.0
2023 Q4 1,271 0 0 0.0
2023 Q3 1,209 0 0 0.0
2023 Q2 1,251 0 0 0.0
2023 Q1 1,465 0 0 0.0
2022 Q4 1,400 0 0 0.0
2022 Q3 1,547 0 0 0.0
2022 Q2 1,738 0 0 0.0
2022 Q1 1,851 2 0 1080.5
2021 Q4 3,962 0 0 0.0
2021 Q3 4,471 0 0 0.0
2021 Q2 4,071 0 0 0.0
2021 Q1 5,236 0 0 0.0
2020 Q4 4,380 1 1 228.3
2020 Q3 4,245 1 0 235.6
2020 Q2 3,256 0 0 0.0
2020 Q1 4,665 0 0 0.0
2019 Q4 4,262 0 0 0.0
2019 Q3 3,926 0 0 0.0
2019 Q2 4,177 0 0 0.0
2019 Q1 2,820 1 0 354.6
2018 Q4 4,220 0 0 0.0
2018 Q3 2,800 0 0 0.0
2018 Q2 5,660 0 0 0.0
2018 Q1 3,315 0 0 0.0
2017 Q4 4,100 0 0 0.0
2017 Q3 3,746 0 0 0.0
2017 Q2 4,160 1 0 240.4
2017 Q1 3,113 0 0 0.0
2016 Q4 3,397 0 0 0.0
2016 Q3 3,669 0 0 0.0
2016 Q2 4,544 0 0 0.0
2016 Q1 3,120 0 0 0.0
2015 Q4 3,637 0 0 0.0
2015 Q3 3,282 0 0 0.0
2015 Q2 3,835 0 0 0.0
2015 Q1 2,613 0 0 0.0
2014 Q4 3,813 1 0 262.3
2014 Q3 3,909 0 0 0.0
2014 Q2 4,004 2 0 499.5
2014 Q1 3,220 1 0 310.6
2013 Q4 4,131 0 0 0.0
2013 Q3 3,843 0 0 0.0
2013 Q2 3,936 2 0 508.1
2013 Q1 4,011 0 0 0.0
2012 Q4 3,911 0 0 0.0
2012 Q3 3,940 0 0 0.0
2012 Q2 3,849 0 0 0.0
2012 Q1 2,767 2 1 722.8
2011 Q4 3,871 0 0 0.0
2011 Q3 3,531 0 0 0.0
2011 Q2 4,589 0 0 0.0
2011 Q1 3,987 0 0 0.0
2010 Q4 3,989 0 0 0.0
2010 Q3 3,458 2 1 578.4
2010 Q2 4,440 0 0 0.0
2010 Q1 1,600 0 0 0.0
2009 Q4 4,711 0 0 0.0
2009 Q3 6,196 0 0 0.0
2009 Q2 5,996 2 0 333.6
2009 Q1 4,451 0 0 0.0
2008 Q4 5,645 4 3 708.6
2008 Q3 5,162 3 1 581.2
2008 Q2 5,951 0 0 0.0
2008 Q1 6,047 6 0 992.2
2007 Q4 12,049 0 0 0.0
2007 Q3 11,042 0 0 0.0
2007 Q2 10,000 0 0 0.0
2007 Q1 8,802 1 0 113.6
2006 Q4 9,413 0 0 0.0
2006 Q3 9,297 7 0 752.9
2006 Q2 9,911 0 0 0.0
2006 Q1 9,780 5 1 511.2
2005 Q4 9,345 0 0 0.0
2005 Q3 9,911 6 1 605.4
2005 Q2 9,318 0 0 0.0
2005 Q1 8,529 2 0 234.5
2004 Q4 8,213 0 0 0.0
2004 Q3 7,618 0 0 0.0
2004 Q2 8,036 0 0 0.0
2004 Q1 7,938 0 0 0.0
2003 Q4 7,562 0 0 0.0
2003 Q3 7,536 0 0 0.0
2003 Q2 7,700 0 0 0.0
2003 Q1 6,367 0 0 0.0
2002 Q4 6,644 1 0 150.5
2002 Q3 7,382 0 0 0.0
2002 Q2 10,351 2 0 193.2
2002 Q1 9,251 0 0 0.0
2001 Q4 10,098 2 1 198.1
2001 Q3 9,680 0 0 0.0
2001 Q2 10,076 0 0 0.0
2001 Q1 9,044 0 0 0.0
2000 Q4 10,777 4 1 371.2
2000 Q3 10,288 0 0 0.0
2000 Q2 9,304 0 0 0.0
2000 Q1 8,193 2 0 244.1
No fatalities recorded at this mine.

Reportable incidents

20 on file

2016 · 1 incident

July 19, 2016 NC · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor OTHER
Martin Marietta Materials Inc · (Not Elsewhere Classified)

Employee was found unresponsive at approximately 05:15 p.m. by the Plant Manager in the Primary Control Room. Employee subsequently was pronounced deceased of apparent natural causes.

2004 · 1 incident

April 6, 2004 NC · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
American Stone Company · Fall from machine

EE HAD GOTTEN OUT OF HIS PIT TRUCK (769D) TO MOVE A ROCK AFTER HE HAD DUMPED IN THE JAW. HE THEN WENT TO CLIMB BACK INTO THE TRUCK WHEN HE MISSED THE HADNDRAIL AND SLIPPED. HE FELL BACK AND LANDED ON HIS LEFT SIDE. HE WAS COMPLAINING ABOUT PAIN IN HIS LEFT LEG AROUND HIS THIGH. HE WAS THEN TRANSPORTED BY AMBULANCE TO UNC E.R.

1996 · 1 incident

February 7, 1996 NC · Metal/Non-Metal mechanic helper HANDTOOLS (NONPOWERED)
American Stone Company · Struck against stationary object

EMPLOYEE ADJUSTING TAIL PULLEY, WRENCH SLIPPED AND HIT LEFT THUMB ON ANGLE IRON. EMPLOYEE REPORTED THE ACCIDENT IMMEDIATELY, THOUGHT THUMB WAS JAMMED. IT KEPT HURTING. WENT TO THE DR. 3-18-96, THUMB WAS BROKE.

1995 · 1 incident

December 15, 1995 NC · Metal/Non-Metal drill operator MACHINERY
American Stone Company · Caught in, under or between (Not Elsewhere Classified)

WAS IN PROCESS OF TAKING CRUSHER APART. EE WAS OUT OF CRANE OPERATOR'S VIEW, HE WALKED BEHIND CRUSHER, BOWL WAS LIFTED AND HE WAS PINNED BETWEEN BOWL AND HAND RAILS AS IT WAS SWUNG AROUND.

1992 · 2 incidents

November 4, 1992 NC · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
American Stone Company · Struck by... (Not Elsewhere Classified)

CLEANING BROKE PARTS ON PIT TRUCK WITH KNIFE. KNIFE FOLDED BACK ON HAND, CUTTING HAND AND REQUIRING FOUR STITCHES.

July 27, 1992 NC · Metal/Non-Metal coal/ore shovel operator, shoveler, power shoveler SLIP OR FALL OF PERSON
American Stone Company · Fall from scaffolds, walkways, platforms

46453ING MACHINE. FOOT SLIPPED ON CATWALK,EMPL FELL CUTTING RIGHT KNEE.

1989 · 1 incident

November 30, 1989 NC · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
American Stone Company · Struck by... (Not Elsewhere Classified)

WEDGE AT JAW CRUSHER HIT EMPLOYEE ON RIGHT SIDE OF FACE WHEN IT PROJECTILED OUT OF THE CRUSHER.

1987 · 6 incidents

December 14, 1987 NC · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
American Stone Company · Struck by flying object

CHOPPING WOOD A7 PLANT FOR WOOD HEATER. PIECE OF WOOD FLEW UP, HITTING EMPLOYEE IN MOUTH. HAD TO HAVE 5 STITCHES IN UPPER LIP.

October 23, 1987 NC · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
American Stone Company · Struck by falling object

EMPLOYEE WAS CH5NGING CUTTING EDGE ON LOADER BUCKET A PIECE OF STEEL FELL ON HIS FOOT

September 25, 1987 NC · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDTOOLS (NONPOWERED)
American Stone Company · Struck by... (Not Elsewhere Classified)

BEATING IN PIN 3N LOADER TOOTH, HAMMER GLANCED OFF PIN AND BROKE PIECE OF TOOTH.

June 16, 1987 NC · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
American Stone Company · Fall from machine

1ST ACCIDENT, E4PLOYEE WAS IN PIT - SOMEHOW HE FELL OUT OF 35 TON WABCO TRUCK

June 16, 1987 NC · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
American Stone Company · Fall from machine

2ND ACCIDENT- E4PLOYEE WAS AT FUEL PUMP AND SOMEHOW FELL OUT OF 35 TON WABCO TRUCK.

June 12, 1987 NC · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
American Stone Company · Over-exertion (Not Elsewhere Classified)

EMPLOYEE WAS ON3CONVEYOR BELT AND GOT OFF AND TWISTED BACK.

1986 · 1 incident

February 8, 1986 NC · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
American Stone Company · Caught in, under or between a moving and a stationary object

EMPLOYEE WAS LO5DING PIECE OF STEEL ON TRUCK THE STEEL SLIPPED AND MASHED HIS RIGHT THUMB

1985 · 2 incidents

February 20, 1985 NC · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
American Stone Company · Fall to lower level, (Not Elsewhere Classified)

EMP WAS COMING DOWN STEPS AFTER WORKING ON CONVEYOR STEPPED IN HOLE AND TWISTED ANKLE

January 18, 1985 NC · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger HANDLING OF MATERIALS
American Stone Company · Struck against stationary object

EMPLOYEE WAS WORKING ON BOOM POINT SHEAVE AND WAS RETURING TO OPER.SEAT AND HIT HIS HEAD ON BOOM

1984 · 2 incidents

December 26, 1984 NC · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver MACHINERY
American Stone Company · Flash burns (welding)

EMPLOYEE WAS HELPING WELDER WORK AND FLASH FROM WELDING ROD BURNED EYES.

September 27, 1984 NC · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger HANDLING OF MATERIALS
American Stone Company · Over-exertion in pulling or pushing objects

EMPLOYEE WAS REPLACING HOIST CABLE ON CRFANE AND WAS PULLING CABLE THRU BOOM POINT SHEAVE AND PULLED MUSCLE IN RIGHT SHOULDER

1983 · 2 incidents

May 12, 1983 NC · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
American Stone Company · Struck against a moving object

EE WAS WORKING ON STOCKPILE WITH FRONT END LOADER BACKED OFF OF STOCKPILE & TURNED OVER.

January 17, 1983 NC · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
American Stone Company · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS PUSHING ON PRY BAR BAR SLIPPED AND HIT EMPLOYEE LEFT SIDE OF HEAD