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Superior Pit & Mill Metal/Non-Metal

Imerys Perlite USA, Inc · Surface

Controlled by Imerys S A

Pinal, Pinal County, AZ · Active

MSHA Mine ID: 0201136

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

Fatalities: 0
Total incidents: 11
Years on record: 2000–2023
Latest incident: Jun 2023

Compliance record

MSHA citations since 2000

145

citations

significant & substantial

$34,261

proposed penalties

$34,261

paid to date

Source: MSHA violations data, updated weekly.

Quarterly safety rates

Citations per million employee-hours, as reported to MSHA

Quarter	Hours worked	Citations	Per 1M hrs
2025 Q4	3,133	0	0.0
2025 Q3	1,110	0	0.0
2025 Q2	1,052	1	950.6
2025 Q1	3,356	0	0.0
2024 Q4	1,049	0	0.0
2024 Q3	1,089	0	0.0
2024 Q2	1,026	0	0.0
2024 Q1	3,440	0	0.0

Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.

No fatalities recorded at this mine.

Reportable incidents

11 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 NO VALUE FOUND

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.