Mining Incidents

Rockfield Plant Metal/Non-Metal

Controlled by Cemex S A
Herndon, Fresno County, CA  ·  Active
MSHA Mine ID: 0401897

Rockfield Plant has $52K in proposed MSHA penalties and $2K outstanding across 2 contested dockets, plus health sampling and the full incident record.

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Fatalities
0
Total incidents
23
Years on record
1984–2024
Latest incident
Aug 2024
Compliance record
MSHA citations since 2000
219
citations
61
significant & substantial
$52,246
proposed penalties
$48,456
paid to date
93% of proposed penalties paid to date, a $3,790 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
82
inspections on record
1,741
inspection hours
12.6
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.
219 citations across 1,741 inspection hours.
Source: MSHA inspections data, updated weekly.

Rockfield Plant has $52K in proposed MSHA penalties and $2K outstanding across 2 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.
$52K
proposed penalties
$50K
current assessed
$48K
paid to date
$2K
outstanding
210 assessments are final orders; 2 contested dockets.
As of the most recent assessment on 2026-04-29.
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 13,200 0 0 0.0
2025 Q3 14,294 2 0 139.9
2025 Q2 14,036 2 0 142.5
2025 Q1 14,466 2 0 138.3
2024 Q4 12,359 0 0 0.0
2024 Q3 13,135 0 0 0.0
2024 Q2 12,982 6 0 462.2
2024 Q1 11,650 1 0 85.8
Show 96 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2023 Q4 11,156 0 0 0.0
2023 Q3 12,426 1 0 80.5
2023 Q2 12,059 0 0 0.0
2023 Q1 10,417 0 0 0.0
2022 Q4 10,241 0 0 0.0
2022 Q3 11,284 3 0 265.9
2022 Q2 12,734 0 0 0.0
2022 Q1 12,546 3 1 239.1
2021 Q4 11,797 0 0 0.0
2021 Q3 12,682 1 0 78.9
2021 Q2 12,772 0 0 0.0
2021 Q1 12,097 6 0 496.0
2020 Q4 9,479 0 0 0.0
2020 Q3 9,301 0 0 0.0
2020 Q2 9,383 7 1 746.0
2020 Q1 9,739 7 4 718.8
2019 Q4 9,800 0 0 0.0
2019 Q3 10,959 10 4 912.5
2019 Q2 10,666 0 0 0.0
2019 Q1 8,928 2 0 224.0
2018 Q4 9,460 0 0 0.0
2018 Q3 8,471 1 0 118.0
2018 Q2 9,576 0 0 0.0
2018 Q1 8,457 4 0 473.0
2017 Q4 8,809 0 0 0.0
2017 Q3 9,307 5 0 537.2
2017 Q2 9,365 1 1 106.8
2017 Q1 8,835 3 0 339.6
2016 Q4 8,789 0 0 0.0
2016 Q3 9,931 0 0 0.0
2016 Q2 8,866 0 0 0.0
2016 Q1 9,224 0 0 0.0
2015 Q4 8,399 8 1 952.5
2015 Q3 8,021 3 1 374.0
2015 Q2 6,068 0 0 0.0
2015 Q1 7,039 5 0 710.3
2014 Q4 6,925 0 0 0.0
2014 Q3 8,808 0 0 0.0
2014 Q2 8,124 1 1 123.1
2014 Q1 8,075 3 2 371.5
2013 Q4 8,145 0 0 0.0
2013 Q3 10,157 3 1 295.4
2013 Q2 8,981 3 1 334.0
2013 Q1 9,114 0 0 0.0
2012 Q4 8,121 0 0 0.0
2012 Q3 9,642 3 0 311.1
2012 Q2 8,712 0 0 0.0
2012 Q1 6,853 5 4 729.6
2011 Q4 7,504 0 0 0.0
2011 Q3 7,816 0 0 0.0
2011 Q2 7,514 2 0 266.2
2011 Q1 6,664 0 0 0.0
2010 Q4 6,116 3 1 490.5
2010 Q3 6,616 0 0 0.0
2010 Q2 7,314 9 6 1230.5
2010 Q1 6,919 0 0 0.0
2009 Q4 7,290 9 1 1234.6
2009 Q3 6,741 0 0 0.0
2009 Q2 7,186 3 0 417.5
2009 Q1 7,060 5 2 708.2
2008 Q4 7,570 0 0 0.0
2008 Q3 7,869 0 0 0.0
2008 Q2 8,447 6 3 710.3
2008 Q1 9,344 7 5 749.1
2007 Q4 9,065 0 0 0.0
2007 Q3 9,877 0 0 0.0
2007 Q2 10,403 0 0 0.0
2007 Q1 9,467 0 0 0.0
2006 Q4 8,639 4 2 463.0
2006 Q3 9,699 0 0 0.0
2006 Q2 9,616 0 0 0.0
2006 Q1 9,537 4 1 419.4
2005 Q4 10,259 0 0 0.0
2005 Q3 10,661 0 0 0.0
2005 Q2 10,563 3 0 284.0
2005 Q1 9,848 0 0 0.0
2004 Q4 9,530 7 1 734.5
2004 Q3 10,181 12 6 1178.7
2004 Q2 10,053 0 0 0.0
2004 Q1 9,294 7 4 753.2
2003 Q4 9,185 0 0 0.0
2003 Q3 9,392 0 0 0.0
2003 Q2 9,255 4 1 432.2
2003 Q1 8,843 4 1 452.3
2002 Q4 8,361 0 0 0.0
2002 Q3 8,831 6 1 679.4
2002 Q2 9,099 0 0 0.0
2002 Q1 8,038 0 0 0.0
2001 Q4 8,194 5 1 610.2
2001 Q3 9,079 0 0 0.0
2001 Q2 9,380 0 0 0.0
2001 Q1 9,475 0 0 0.0
2000 Q4 9,429 0 0 0.0
2000 Q3 10,070 0 0 0.0
2000 Q2 10,361 12 2 1158.2
2000 Q1 9,514 0 0 0.0
No fatalities recorded at this mine.

Reportable incidents

23 on file

2024 · 2 incidents

August 15, 2024 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
CEMEX Construction Materials Pacific, LLC · Struck against a moving object

Employee was operating CAT 980k front end loader. While driving through the shipping yard at some point, employee hit a pothole causing employee to get jarred on the seat, this was a combination of operating while out of position ergonomically,

April 17, 2024 CA · Metal/Non-Metal rotary bucket excavator operator POWERED HAULAGE
CEMEX Construction Materials Pacific, LLC · Struck against a moving object

The EE was in the passenger seat of a haul truck, ridding back to the excavator and the main yard, when the haul truck struck a bump. The EE sustained a contusion on the left side of the buttocks from the seat belt support plastic.

2012 · 1 incident

July 18, 2012 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman SLIP OR FALL OF PERSON
CEMEX Construction Materials Pacific, LLC · Over-exertion (Not Elsewhere Classified)

EE was called on the company radio and told that the Jaw Rock Chute to the ground was plugged with a big rock. He walked up the small pile of rock under the chute in order to dislodge the large rock. When the rock was dislodged the other rocks in the chute began to flow and he turned to see what the noise was. At that point he felt a pain in his left leg.

2009 · 2 incidents

July 13, 2009 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Cemex Construction Materials LP · Caught in, under or between a moving and a stationary object

A screen cover (wire cloth) fell into the "Jaw Rock" chute. The victim was removeing the screen cover and a rock approx. 4" x 8" came traveling down the chute and pinched his fingers btwn. the rock and chute wall. He suffered lacerations on his L/H middle and ring fingers. The middle finger was broken behind the fingernail.

February 13, 2009 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
Cemex Construction Materials LP · Caught in, under or between a moving and a stationary object

Laborer was shoveling material into loader bucket. Material slid off and employee was pinched between bucket and pile. Employee suffered bruising to both thighs. Employee was treated and released at Dr.'s Office. Given pain medication and modified duty.

1997 · 1 incident

March 11, 1997 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
CEMEX · Over-exertion in lifting objects

REMOVING LOOSE STEEL PLATE FROM INSIDE OF BUNKER & STRAINED LOWER BACK.

1994 · 1 incident

May 19, 1994 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall onto or against objects

LOST FOOTING ON FLUME CAT WALK. CAUGHT SELF WITH RIGHT HAND.

1993 · 2 incidents

December 30, 1993 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall onto or against objects

FITTING/WELDING PANELS IN MAIN BOX, CHARGE END OF SCALPER. THERE WAS DENSE FOG, FOOT SLIPPED ON WET SURFACE CAUSING ME TO FALL AGAINST CROSS BEAM AT HEAD PULLEY MAIN BELT.

January 18, 1993 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
CEMEX · Over-exertion in lifting objects

SHOVELING WASTE SAND, PULLED MUSCLE IN LOWER BACK.

1992 · 4 incidents

October 27, 1992 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
CEMEX · Struck by... (Not Elsewhere Classified)

USING PRYBAR TO INSTALL BOLTS IN DRIVE COUPLING. PRYBAR SLIPPED OFF DRIVE UNIT, OTHER END STRUCK EE ON RIGHT SIDE OF FACE CUTTING FACE NEXT TO UPPER LIP.

July 7, 1992 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall to lower level, (Not Elsewhere Classified)

REPLACING TROUGHING ROLLER ON DUST BELT-FELL THRU HOLE IN GRATING WHILE WALKING ON DECK TOWARDS DUST HOPPER BELT.SCRAPED RIGHT KNEE AND LOWER RIGHT BACK-ROCK DUST IN RIGHT EYE.

April 27, 1992 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall onto or against objects

WHILE TIGHTENING DOWN HEAD PLATE BOLTS WITH IMPACT HAMMER,THE HAMMER STARTED TO FALL OUT OF HANDS. WENT TO READJUST HANDS AND FEET SLIPPED AND HE FELL ONTO THE HANDRAIL ON LEFT SIDE AT THE RIB S -BROKE 2 RIBS #6 & #7 ON LEFT SIDE.

March 4, 1992 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall to the walkway or working surface

WHILE MANUVERING 1 1/16" SCREEN INTO POSITION TO INSTALL INTO SHAKER,MATERIAL ON DECK SHIFTED UNDERFOOT CAUSING LOSS OF BALANCE AND FALL -INJURED BACK.

1991 · 4 incidents

November 19, 1991 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
CEMEX · Fall onto or against objects

WHILE MOVING A SUCTION HOSE FOR A PORTABLE PUMP, EMPLOYEE LOST HIS BALANCE AND HIT HIS RIGHT WRIST ON BREAKOVER CLAMP.

July 5, 1991 CA · Metal/Non-Metal beltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor rider SLIP OR FALL OF PERSON
CEMEX · Fall onto or against objects

STEPPED ON CONVEYOR FRAME TO LOWER 1 1/2 INCH GRAVEL CHUTE. WHILE STADNING ON CONVEYOR FRAME FOOT SLIPPED AND CAUGHT LEFT WRIST ON CONVEYOR GUARD.

May 2, 1991 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler HANDLING OF MATERIALS
CEMEX · Struck by falling object

TWO EMPLOYEES HAD INSTALLED DUMP CABLE ON DRAGLINE IN THREE WAY SOCKE TWHEN THE NEW EMPLOYEE PULLED THE CABLE BEFORE THE SOCKET WEDGE WAS DRIVEN ALL THE WAY IN SOCKET CAUSING THE CABLE TO COME OUT WHILE COILED.

April 10, 1991 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler SLIP OR FALL OF PERSON
CEMEX · Fall to the walkway or working surface

IT APPEARS EE STEPED ON SOME GREASE ON THE GROUND FROM THE DRALINE AND CARRIED IT TO A STEEL WALKWAY AREA AND AS HE STARTED TO ENTER THE HOUSE AREA SLIPPED AND FELL.

1989 · 2 incidents

March 15, 1989 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
CEMEX · Fall from machine

EMPL HAD JUST REPLACED FILTER ON TEREX LOADER AND ASK OPERATOR TO START ENGINE AT HIGH RPM THE MAHCINE MOVED FORWARD THROWING EMPL TO GROUND APPROX 4 TO 5'

February 27, 1989 CA · Metal/Non-Metal driller, highwall operator, highwall drill operator POWERED HAULAGE
CEMEX · Over-exertion (Not Elsewhere Classified)

EMPLOYEE CLAIMS THAT DURING PERIOD OF EITHER 022789 OR 022889 WHILE OPERATING LOADER ON ROUGH GROUND THE STEERING WHEEL SLIPPED OUF OF HIS HAND HE GRABBED IT & STRAINED HIS LEFT SHOULDER

1988 · 1 incident

July 30, 1988 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
CEMEX · Fall to the walkway or working surface

EMPL WAS CARRYING HINGE TO FEEDER AREA DOWN AN INCLINED CONCRETE WALKWAY WHEN HIS FOOT SLIPPED CAUSING HIM TO FALL AND THE HINGE APPROX 80 LBS LANDED ON HIS LEFT ARM

1987 · 1 incident

April 28, 1987 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Lone Star Industries Inc · Struck by... (Not Elsewhere Classified)

WHILE REPLACING3WORN BELT LACING,EMPLOYEE ATTEMPT TO HOLD BOLT ON BOTTOM SIDE OF THE BOLT. THE BOLT WASN'T FULLY ENGAGED IN THE LOCK OF THE FASTENER & TURNED WHEN IMPACT WRENCH WAS APPLIED TI TO NUT. 3

1985 · 1 incident

August 31, 1985 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Lone Star Industries Inc · Caught in, under or between a moving and a stationary object

EMP WAS ASSISTING IN REMOVAL OF SCREEN WHEN IT C BECAME LODGED HE ADDED MORE PRESSURE TO DIS-LODGE IT AND WHEN IT CAME LOOSE HIS LITTLE FINGER ON THE RIGHT HAND CAUGHT BETWEEN THE SCREEN AND A STEEL I-BEAM WHICH CAUSED A COMPOUND FRACTURE

1984 · 1 incident

May 15, 1984 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler MACHINERY
Lone Star Industries Inc · Caught in, under or between (Not Elsewhere Classified)

HE WAS WELDING HE NOTICED A VOLTAGE DROP FROM THE GASOLINE DRIVEN WELDER HE ASK THE ASSIST TO SEE IF A PIN HAD COME LOOSE FROM THE GOVERNOR ASSEMBLY THE ASSIST REACHED FOR THE CONTROL ROD NOT THINKING THE ENGINE FAN WAS TURNING TO CLOSE TO HIM AT THIS TIME HIS FINGERS CAME IN CONTACT W/ THE FAN.

For insurers, brokers, and safety consultants

The full compliance file on Rockfield Plant

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.