Mining Incidents

Superior Pit & Mill Metal/Non-Metal

Controlled by Imerys S A
Pinal, Pinal County, AZ  ·  Active
MSHA Mine ID: 0201136

Superior Pit & Mill has $34K in proposed MSHA penalties and $0 outstanding across 4 contested dockets, plus health sampling and the full incident record.

Watch this mine

Email me when a new MSHA incident is filed at Superior Pit & Mill.

Fatalities
0
Total incidents
26
Years on record
1995–2023
Latest incident
Jun 2023
Compliance record
MSHA citations since 2000
145
citations
47
significant & substantial
$34,261
proposed penalties
$34,261
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
72
inspections on record
970
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: 970 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.
Source: MSHA inspections data, updated weekly.

Superior Pit & Mill has $34K in proposed MSHA penalties and $0 outstanding across 4 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.
$34K
proposed penalties
$34K
current assessed
$34K
paid to date
$0
outstanding
144 assessments are final orders; 4 contested dockets.
As of the most recent assessment on 2026-03-16.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
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
2025 Q4 3,133 0 0 0.0
2025 Q3 3,727 0 0 0.0
2025 Q2 3,530 1 0 283.3
2025 Q1 3,356 0 0 0.0
2024 Q4 3,694 0 0 0.0
2024 Q3 4,433 0 0 0.0
2024 Q2 4,220 0 0 0.0
2024 Q1 4,567 0 0 0.0
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 3,827 0 0 0.0
2023 Q3 4,075 0 0 0.0
2023 Q2 4,062 0 0 0.0
2023 Q1 4,107 2 2 487.0
2022 Q4 3,248 0 0 0.0
2022 Q3 3,435 0 0 0.0
2022 Q2 3,408 0 0 0.0
2022 Q1 3,177 0 0 0.0
2021 Q4 2,713 0 0 0.0
2021 Q3 3,493 0 0 0.0
2021 Q2 2,870 1 0 348.4
2021 Q1 3,526 0 0 0.0
2020 Q4 3,009 0 0 0.0
2020 Q3 3,694 2 0 541.4
2020 Q2 3,567 0 0 0.0
2020 Q1 3,628 2 0 551.3
2019 Q4 2,095 0 0 0.0
2019 Q3 2,443 0 0 0.0
2019 Q2 2,936 2 1 681.2
2019 Q1 3,876 1 0 258.0
2018 Q4 3,553 0 0 0.0
2018 Q3 3,495 1 0 286.1
2018 Q2 3,397 0 0 0.0
2018 Q1 3,021 0 0 0.0
2017 Q4 2,876 0 0 0.0
2017 Q3 3,019 0 0 0.0
2017 Q2 3,080 6 0 1948.1
2017 Q1 4,631 1 0 215.9
2016 Q4 3,157 0 0 0.0
2016 Q3 3,733 6 0 1607.3
2016 Q2 3,126 0 0 0.0
2016 Q1 3,218 0 0 0.0
2015 Q4 2,995 6 2 2003.3
2015 Q3 3,376 0 0 0.0
2015 Q2 3,928 0 0 0.0
2015 Q1 4,332 3 1 692.5
2014 Q4 4,135 2 1 483.7
2014 Q3 4,991 5 1 1001.8
2014 Q2 2,305 0 0 0.0
2014 Q1 3,511 12 5 3417.8
2013 Q4 3,144 0 0 0.0
2013 Q3 3,994 0 0 0.0
2013 Q2 3,912 1 1 255.6
2013 Q1 4,248 0 0 0.0
2012 Q4 3,476 2 0 575.4
2012 Q3 3,673 0 0 0.0
2012 Q2 3,688 2 1 542.3
2012 Q1 3,721 0 0 0.0
2011 Q4 2,444 3 1 1227.5
2011 Q3 3,242 1 0 308.5
2011 Q2 3,671 12 8 3268.9
2011 Q1 4,297 0 0 0.0
2010 Q4 3,567 14 6 3924.9
2010 Q3 3,589 0 0 0.0
2010 Q2 4,075 1 0 245.4
2010 Q1 3,567 0 0 0.0
2009 Q4 3,206 2 2 623.8
2009 Q3 3,428 0 0 0.0
2009 Q2 2,806 5 0 1781.9
2009 Q1 3,123 1 0 320.2
2008 Q4 3,467 0 0 0.0
2008 Q3 3,832 0 0 0.0
2008 Q2 4,077 0 0 0.0
2008 Q1 4,028 0 0 0.0
2007 Q4 4,063 0 0 0.0
2007 Q3 3,793 0 0 0.0
2007 Q2 3,822 1 0 261.6
2007 Q1 3,784 0 0 0.0
2006 Q4 3,568 0 0 0.0
2006 Q3 3,687 1 0 271.2
2006 Q2 3,844 0 0 0.0
2006 Q1 3,222 0 0 0.0
2005 Q4 3,597 1 0 278.0
2005 Q3 3,769 0 0 0.0
2005 Q2 3,582 0 0 0.0
2005 Q1 3,975 0 0 0.0
2004 Q4 4,017 1 0 248.9
2004 Q3 3,972 0 0 0.0
2004 Q2 4,527 5 1 1104.5
2004 Q1 4,616 0 0 0.0
2003 Q4 4,113 0 0 0.0
2003 Q3 5,881 18 4 3060.7
2003 Q2 5,386 0 0 0.0
2003 Q1 5,172 0 0 0.0
2002 Q4 4,048 0 0 0.0
2002 Q3 4,963 1 0 201.5
2002 Q2 5,024 0 0 0.0
2002 Q1 4,697 0 0 0.0
2001 Q4 4,322 0 0 0.0
2001 Q3 4,503 0 0 0.0
2001 Q2 5,053 0 0 0.0
2001 Q1 5,705 2 1 350.6
2000 Q4 5,748 0 0 0.0
2000 Q3 4,930 0 0 0.0
2000 Q2 4,868 9 4 1848.8
2000 Q1 5,439 7 5 1287.0
No fatalities recorded at this mine.

Reportable incidents

26 on file

2023 · 1 incident

June 8, 2023 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
Imerys Perlite USA, Inc · Struck by falling object

Worker was attempting to weld a short length of pipe to the bottom of a bin. EE tack welded the pipe in place in preparation for the weld. The tack weld failed and the pipe fell and the employees thumb was impacted between the pipe and adjacent angle iron. The impact resulted in a fracture to the left thumb.

2020 · 1 incident

May 11, 2020 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver STEPPING OR KNEELING ON OBJECT
Imerys Perlite USA, Inc · Struck against stationary object

After loading at Superior Pit and Mill location driver was performing an inter-trip inspection when EE stepped down off of the loading platform onto a rock and turned EE's ankle. Driver experienced immediate pain and the sensation of rubber bands popping.

2019 · 1 incident

June 20, 2019 AZ · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Caught in, under or between a moving and a stationary object

Individual was performing maintenance on a bucket elevator and got their fingers crushed when the bucket elevator belt unexpectedly moved

2013 · 1 incident

January 14, 2013 AZ · Metal/Non-Metal ledgeman/hand, quarry man HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Struck against stationary object

EE was taking a measurement of conveyor belt. Tape measure got caught and ee reached to grab the tape and while doing so the edge cut his index finger. Required sutures to repair wound.

2005 · 1 incident

March 24, 2005 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Struck by... (Not Elsewhere Classified)

WHILE REMOVING A SECTION OF HANDRAIL, EE WAS HOLDING HANDRAIL AND PULLING IT UPWARD WHILE OTHER EE WAS STRIKING HANDRAIL. EE THEN MOVED HAND AND OTHER EE STRUCK HAND WITH PRY BAR.

2003 · 2 incidents

October 30, 2003 AZ · Metal/Non-Metal truck driver HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Struck by... (Not Elsewhere Classified)

TRUCK DRIVER LOADING BULK PERLITE ORE IS LOWERING THE LOAD OUT SOUT BY THE USE OF A CRANK OPERATED WINCH WITH CABLE CONTROLING THE SPOUT WHEN VRANK SPUN DURING SPOUT DOWN MOVEMENT AND THE TRUC K DRIVER ATTEMPTED TO STOP THE CRANK BY PLACING HIS HAND INTO THE CRANK MOVEMENT.

January 20, 2003 AZ · Metal/Non-Metal
Imerys Perlite USA, Inc · Bodily reaction, (Not Elsewhere Classified)

EE STATED THAT WHILE PLUGGING A LEAK BETWEEN #2 ELEVATOR & DRYER INLET HIS SKIN CAME IN CONTACT5 WITH THE INSULATION HE WAS USING. HE STATED THAT THE TOP OF HIS FEET WELTED, IT MOVED UP HIS LEGS TO GROIN AREA & THEN TO CHECK & HANDS

2001 · 1 incident

September 11, 2001 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman MACHINERY
Imerys Perlite USA, Inc · Caught in, under or between (Not Elsewhere Classified)

EE STATED THAT WHILE TRYING TO BREAK LOOSE SOME MATERIAL STUCK IN THE JAW CRUSHER, MATERIAL FELL, CAUSING THE BAR HE WAS USING TO FALL INTO THE CRUSHER JAW WHICH PINNED MOMENTARILY HIS FINGER BETWEEN THE BAR AND PART OF THE UNIT STRUCTURE.

2000 · 3 incidents

November 10, 2000 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Struck by flying object

THE EE STATED THAT WHILE BREAKING ROCKS WITH A SLEDGE HAMMER, A PIECE OF ROCK FLEW OFF AND STRUCK HIM IN THE LEFT LEG JUST BELOW THE KNEE. THE SKIN WAS NOT BROKEN, BUT THERE WAS NOTICEABLE SWE LLING AT THE INJURED AREA.

May 22, 2000 AZ · Metal/Non-Metal miner, nec HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Over-exertion (Not Elsewhere Classified)

EMPLOYEE STATED THAT HE BELIEVES WHILE PREPARINGTHE IMPACT CRUSHER FOR SERVICE HE REINJURED HIS LOWER BACK. EMPLOYEE STATED THAT HE FELT NO PAIN OR DISCOMFORT UNTIL THAT EVENING WHEN GETTING R EADY TO LAY DOWN FOR THE NIGHT. EMPLOYEE ALSO STATED THAT HE BELIEVES IT IS FROM AN UNREPORTED INJURY SEVERAL YEARS AGO. SUSTAINED WHILE MOVING BAGS.

February 25, 2000 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Fall to the walkway or working surface

EE STATED THAT HE WAS USING A PRYBAR TO REMOVE A CONVEYOR OR ROLLER FROM ITS BRACKET. WHILE PUSHING DOWN ON THE PRYBAR, THE PRYBAR SLIPPED CAUSING HIM TO LOSE HIS BALANCE AND FALL TO THE CEMEN T FLOORING ON WHICH HE WAS STANDING.

1999 · 2 incidents

June 3, 1999 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Imerys Perlite USA, Inc · Fall from machine

EE STATED THAT WHILE PERFORMING THE NORMAL TASK OF BREAKING OVERSIZE MATERIAL WITH AN 8 LB. SLEDGEHAMMER HIS LEFT LEG SLIPPED BETWEEN 2 RAILS OF THE FEEDER. THIS CAUSED AN ABRASION TYPE OF BRU ISE TO HIS LEFT THIGH.

January 25, 1999 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Caught in, under or between a moving and a stationary object

EE STATED THAT WHILE ATTEMPTING TO REPAIR A PORTABLE WATER PUMP, THE HOUSING THAT HE WAS DISCONNECTING WAS HEAVIER THAN HE ANTICIPATED AND NOT SUPPORTED BY A SHAFT HE THOUGHT WAS IN PLACE. CAM E DOWN PINNING THE TIP OF HIS SMALL FINGER, LEFTHAND. BETWEEN PUMP FRAME AND HOUSING ITSELF.

1998 · 6 incidents

August 4, 1998 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Over-exertion (Not Elsewhere Classified)

EMPLOYEE STATED THAT WHILE IN A SQUATTING POSITION REMOVING A BRAKE DRUM FROM HIS TRUCK, HE MUST HAVE MOVED WRONG CAUSING MUCH PAIN TO HIS LEFT KNEE.

July 15, 1998 AZ · Metal/Non-Metal assistant mine foreman, assistant mine manager OTHER
Imerys Perlite USA, Inc · Struck by flying object

EE HELPING UNLOAD A VAN OF MATERIAL. (PERLITE) PIECE OF FOREIGN OBJECT FLEW INTO EYE (LEFT) IMBEDDED AND IS IRRTATING EE'S EYE.

July 9, 1998 AZ · Metal/Non-Metal SLIP OR FALL OF PERSON
Imerys Perlite USA, Inc · Fall to the walkway or working surface

EMPLOYEE STATED THAT WHILE WALKING DOWN THE SOUTH SIDE OF THE CONVEYOR INCLINE (CEMENT) APPROX. HALF THE WAY DOWN HE STEPPED ON A SMALL ROCK, CAUSING HIS FEET TO GO OUT FROM UNDER HIM. THE FAL L IMPACT WAS TAKEN ON THE LEFT UPPER HIP/BUTTOCKAREA.

June 5, 1998 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Over-exertion (Not Elsewhere Classified)

EE STATED THAT WHILE ASSISTING THE MAINT. SUPERVISOR INSTAL A PULLEY FRONT EITHER A KNEELING OR SQUATTING POSITION HE FELT A POP IN HIS LEFT KNEE.

January 21, 1998 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
Imerys Perlite USA, Inc · Struck by... (Not Elsewhere Classified)

EE STATED THAT WHILE TRYING TO BREAK LOOSE DRILLB ARS AT QUARRY WHILE CORE DRILLING, HE ACCIDENTALLY SHIFTED THE THROTTLE PAST THE NEUTRAL POSITION INTO THE REVERSE POSITION CAUSING MOVEMENT O F THE DRILL. COWORKER HAD ALREADY ATTACHED AN 18" PIPE WRENCH TO THE BAR WHICH ROTATED AROUND STRIKING EE IN THE LEFT THIGH.

January 15, 1998 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Imerys Perlite USA, Inc · Over-exertion (Not Elsewhere Classified)

WHILE EMPLOYEE WAS ASSISTING MAINTENCE SUPERVISOR SECURE A SMALL MOTOR TO ITS BASE (TIGHTENING DOWN NUTS) EMPLOYEE STATED THAT HE FELT A SHARP PAIN ON THE LEFT SIDE OF HIS UPPER NECK,JUST BELO W THE EAR.EMPLOYEE ALSO STATED THAT DUE TO THE POSITION OF THE BOLTSHE HAD TO POSTION HIS BODY ACCORDINGLY,WHICH IS WHAT HE THINKS CAUSED THE INJURY.

1997 · 4 incidents

May 9, 1997 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Imerys Perlite USA, Inc · Fall from machine

AS EMP WAS STEPPING DOWN FROM FILLING DOZER WITH OIL, LEFT FOOT SLIPPED. AS FOOT SLIPPED, SHIN HIT FRAME AND FOOT WAS CAUGHT INBETWEEN FRAME ANDTRACK CUTTING OPEN SHIN, REQUIRING STITCHES (APP ROX 13), SHIPPING SHIN BONE AND DAMAGING LIGAMENTS AROUND KNEE.

April 22, 1997 AZ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Over-exertion (Not Elsewhere Classified)

AS EMPLOYEE WAS CLEARING PLUGGED ELEVATOR, HE TURNED TO EMPTY SHOVEL AND PULLED HIS GROIN MUSCLE.

February 20, 1997 AZ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer OTHER
Imerys Perlite USA, Inc · Struck by... (Not Elsewhere Classified)

WHILE EE WAS INSPECTING AREA A WIND BLEW UP AND BLEW A PIECE OF PERLITE INTO HIS EYE. THIS CAUSED REDNESS AND IRRITATION TO THE EYEBALL.

February 12, 1997 AZ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Caught in, under or between a moving and a stationary object

AS EE WAS CHANGING FLAT TIRE HE PLACED HIS HAND IN A SPOT THAT WAS CAUGHT BETWEEN THE TIRE RIM AND HUB OF AXLE. WHEN HIS FINGER WAS CAUGHT IT DISLOCATED THE 1ST JOINT JUST ABOVE THE FINGER NAI L.

1996 · 1 incident

November 21, 1996 AZ · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor MACHINERY
Imerys Perlite USA, Inc · Flash burns (welding)

HELPING HOLD METAL WHILE WELDER WAS TACKING STEEL. EYES WERE BURNT FROM WELDING FLASH.

1995 · 2 incidents

August 21, 1995 AZ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS WORKING ONCLEANING NOZZLE ON BELT CONVEYOR NOZZLE KICKED & CUT PALM OF RIGHT HAND

July 18, 1995 AZ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Imerys Perlite USA, Inc · Caught in, under or between (Not Elsewhere Classified)

EE WAS INSTALLING HYD. RAM ON WHEEL LOADER. AS RAM ROTATED HIS LITTLE FINGER ON LEFT HAND WAS CAUGHT AND BROKEN.

For insurers, brokers, and safety consultants

The full compliance file on Superior Pit & Mill

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.