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Merced Aggregates Metal/Non-Metal

Martin Marietta Northern California Aggregates,LLC · Surface

Controlled by Martin Marietta Materials Inc

Merced, Merced County, CA · Active

MSHA Mine ID: 0402841

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Fatalities: 0
Total incidents: 15
Years on record: 2000–2011
Latest incident: Mar 2011

Compliance record

MSHA citations since 2000

155

citations

significant & substantial

$57,866

proposed penalties

$42,159

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	3,986	0	0.0
2025 Q3	961	0	0.0
2025 Q1	6,117	0	0.0
2024 Q3	7,328	0	0.0
2024 Q2	6,569	2	304.5
2024 Q1	1,024	1	976.6
2023 Q3	6,289	0	0.0
2023 Q2	1,260	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

15 on file

2011 · 1 incident

March 14, 2011 CA · Metal/Non-Metal coal/ore shovel operator, shoveler, power shoveler HANDLING OF MATERIALS

Calaveras Materials LLC · Caught in, under or between (Not Elsewhere Classified)

Miner/Employee was assisting in replacing new sand screw wear shoes when EE was repositioning the shoe to the shaft it slipped from his grasp and resulting in a caught between the sand screw tank wall and screw auger flight crushing/minor fracture injury to his left index finger.

2008 · 1 incident

April 30, 2008 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver HANDLING OF MATERIALS

Calaveras Materials LLC · Over-exertion in lifting objects

The employee was cleaning up the surrounding work area when he went to pick up a piece of steel pipe he strained his back.

2007 · 2 incidents

April 23, 2007 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON

Calaveras Materials LLC · Over-exertion (Not Elsewhere Classified)

Employee was cleaning out around conveyor tail pulley and stepped into a muddy area and stepped into a muddy hole.

February 1, 2007 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON

Calaveras Materials LLC · Fall onto or against objects

Employee was climbing into chute area of prewash plant via access door then slipped and fell backwards striking a rock in the chute straining lower back.

2005 · 4 incidents

October 20, 2005 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON

Calaveras Materials LLC · Over-exertion (Not Elsewhere Classified)

TWISTED KNEE WHEN STEPPING OFF EXCAVATOR ON UNEVEN GROUND.

October 17, 2005 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY

Calaveras Materials LLC · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS TRYING TO RELIEVE PRESSURE ON A HYDRAULIC SYSTEM ON THE AUXILARY CRUSHER BY TAKING THE FITTING OFF A CYLINDER. EMPLOYEE DID NOT VERIFY THAT ALL THE PRESSURE WAS EXHAUSTED FROM THE HYDRAULIC SYSTEM. WHEN THE EMPLOYEE ATTEMPTED TO REMOVE A HYDRAULIC HOSE THE COUPLING KICKED BACK AND CAUSED AN INJURY TO THE EMPLOYEE'S RIGHT HAND.

June 27, 2005 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS

Calaveras Materials LLC · Over-exertion in lifting objects

Employee was lifting large batteries and strained left groin.

May 9, 2005 CA · Metal/Non-Metal crane operator, mobile equipment operator (meo), dragline operator, dropball operator, rigger HANDLING OF MATERIALS

Calaveras Materials LLC · Struck by... (Not Elsewhere Classified)

Employee was working on a 988G loader bucket cutting edge using impact wrench to remove bolts. Bolts spun and employee tried to hold the bolt by hand to lock it in place and bolt spun cutting his left middle finger through his glove.

2004 · 2 incidents

June 3, 2004 CA · Metal/Non-Metal water truck operator HANDLING OF MATERIALS

Calaveras Materials LLC · Struck by falling object

WATER TRUCK DRIVER WAS FILLING TRUCK WITH WATER, REMOVED ROPE THAT HOLDS VALVE OPEN & ROD CONNECTED TO VALVE CAME DOWN AND HIT THE DRIVER ON THE HEAD. HEAD CONTUSION.

April 14, 2004 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE

Calaveras Materials LLC · Struck against a moving object

EE WAS KNOCKING DOWN BELLY DUMP WINDROWS WITH LOADER. HE HIT A WET SPOT AND SUNK TO THE RIGHT SIDE, CAUSING EE TO TWIST AND STRAIN A MUSCLE ON RIGHT SIDE OF LOWER BACK. EE WAS IN SEAT AND HAD SAFETY BELT ON.

2003 · 1 incident

September 9, 2003 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY

Calaveras Materials LLC · Flash burns (welding)

EMPLOYEE WAS GRINDING/WELDING ON THE LOADER BUCKET. HE NOTICED NOTHING OUT OF THE ORDINARY DURING WORK SHIFT BUT WHEN HE WENT HOME FELT A DISCOMFORT IN HIS LEFT EYE (FOREIGN BODY/FLASH BURN).

2001 · 1 incident

July 26, 2001 CA · Metal/Non-Metal backhoe operator, trackhoe operator, crane operator SLIP OR FALL OF PERSON

Calaveras Materials LLC · Over-exertion (Not Elsewhere Classified)

STEPPED OFF SCALPING SCREEN ONTO WALKWAY AND TWISTED LEFT KNEE. HAD CLEANED WALKWAY PRIOR TO GOING ONTO SCREEN.

2000 · 3 incidents

December 9, 2000 CA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDTOOLS (NONPOWERED)

Calaveras Materials LLC · Struck by... (Not Elsewhere Classified)

EE WAS REMOVING BEARING RACE FROM TRUNION BEARING. HAMMER SLIPPED OFF CHISEL AND HIT LEFT THUMB, INJURING THUMB AND NAIL. FRACTURED END OF THUMB BELOW LAST JOINT.

December 9, 2000 CA · Metal/Non-Metal mine manager, mine foreman, mine owner SLIP OR FALL OF PERSON

Calaveras Materials LLC · Fall from machine

GETTING PARTS OUT OF STORAGE VAN. SLIPPED AND FELL OUT VAN(4 FT.) LANDED ON LEFT SHOULDER/ELBOW.

August 24, 2000 CA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)

Calaveras Materials LLC · Over-exertion in lifting objects

EE HAD EARLIER PERFORMED HEAVY PIPE WRENCHING INA CONFINED POSITION THEN HAD GROWING PAIN IN ABDOMEN AS HE CHANGED SCREEN CLOTH.