Mining Incidents

Clayton Aggregates Metal/Non-Metal

clayton, Contra Costa County, CA  ·  Active
MSHA Mine ID: 0400159

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Fatalities
0
Total incidents
20
Years on record
2000–2021
Latest incident
Dec 2021
Compliance record
MSHA citations since 2000
200
citations
36
significant & substantial
$43,956
proposed penalties
$42,058
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 S&S Per 1M hrs
2025 Q4 7,787 1 0 128.4
2025 Q3 6,687 3 0 448.6
2025 Q2 10,060 0 0 0.0
2024 Q4 2,007 0 0 0.0
2024 Q3 11,922 0 0 0.0
2024 Q2 13,696 8 2 584.1
2024 Q1 1,740 0 0 0.0
2023 Q4 2,871 0 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

20 on file

2021 · 1 incident

December 15, 2021 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Martin Marietta Northern California Aggregates,LLC · Over-exertion in lifting objects

Employee was clearing rock from crusher when they felt a tweak in their shoulder. It was initially treated with first aid. When the condition didn't improve, the employee received an MRI. The event became reportable on 2/9/2022 when a doctor placed EE on total disability following the results of the MRI.

2018 · 2 incidents

August 17, 2018 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
Martin Marietta Northern California Aggregates,LLC · Caught in, under or between a moving and a stationary object

EE was removing nuts from the secondary crusher frame with a 1" pneumatic impact wrench. When the nut broke free the rotational force of the pneumatic wrench spun the nut up the threads pinning EE's right index finger between the handle on the impact wrench and the overhang of the crusher frame. EE received 7 sutures to the outside of the right index finger.

June 16, 2018 CA · Metal/Non-Metal electrician helper SLIP OR FALL OF PERSON
Martin Marietta Northern California Aggregates,LLC · Fall to lower level, (Not Elsewhere Classified)

Temporary scaffolding staircase was removed. Area was not safely cordoned off correctly. Employee fell from 7' elevated height at doorway with no stairs. Employee suffered bruising and laceration.

2017 · 1 incident

October 20, 2017 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Martin Marietta Northern California Aggregates,LLC · Over-exertion in pulling or pushing objects

Injured employee examined what needed to be cleaned on the transfer screen to move the gates. EE was in a squatting position and barred the material that was stopping the gates from moving. In the squatting position EE grabbed the chute opening with hands out and when EE pulled self up EE felt a sharp pain in back and a popping sound.

2014 · 1 incident

August 15, 2014 CA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
Martin Marietta Northern California Aggregates,LLC · Struck against a moving object

An employee was hauling material to the dump grizzly, when they felt a pain in the lower back. The initial diagnosis was a strain to the lower back and they were returned to regular duties on 8/16/2014. No medical treatment was given at this time. The employee was further diagnosed and was removed from the duties on 6/9/2015.

2013 · 2 incidents

October 4, 2013 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Martin Marietta Northern California Aggregates,LLC · Struck against a moving object

From a previous injury that was being treated by the insurance carrier, the employee stated both knees and the back was getting sore again over the past few days. The employee was conducting their regular job operating the Pit Loader and Dozer periodically in the pit area.

June 25, 2013 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON
Martin Marietta Northern California Aggregates,LLC · Over-exertion (Not Elsewhere Classified)

Walking on an uneven surface while performing a pre-task inspection, left knee hyper-extended as he strode and hit a depression.

2012 · 1 incident

October 15, 2012 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler MACHINERY
Martin Marietta Northern California Aggregates,LLC · Over-exertion (Not Elsewhere Classified)

The employee was pumping a manual grease gun when he felt some pain in the right elbow. The employee was sent to the clinic and was diagnosed with a minor strain to the elbow. The employee was sent back to regular duty with no retractions. The modifications were given based on the California Workers Comp. criteria only.

2011 · 1 incident

February 13, 2011 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON

Employee was climbing down into the feeder that was being installed into #2 conveyor tunnel. The 4' "A" frame ladder slipped from under him and he hit his right elbow and right shoulder. His left knee was reported as sore due to walking on even surfaces during this project.

2010 · 1 incident

March 9, 2010 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Martin Marietta Northern California Aggregates,LLC · Over-exertion (Not Elsewhere Classified)

EE was lifting two tools out of a crate and while doing so felt pain in his abdomen. A bump developed and was diagnosed as an umbilical hernia.

2009 · 3 incidents

October 24, 2009 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY

Employees welding lagging onto a tail pulley, injured employee said he caught a couple of flashes during the 11 hour shift. At the end of the shift he realized that he had received a flash burn in both eyes.

March 3, 2009 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)

Two employees were replacing a bearing on the ecentric shaft of the Noble feeder in #2 conveyor tunnel. The shaft and bearings were supported by a chain and a chain hoist. One of the chains slipped allowing the bearing to twist and drop two inches, hitting employees left thumb and breaking it.

2006 · 4 incidents

November 13, 2006 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler MACHINERY
Martin Marietta Northern California Aggregates,LLC · Caught in, under or between (Not Elsewhere Classified)

While operating an electrical hoist he caught his hand on the cable. His left ring finger became caught in the block.

October 30, 2006 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech DISORDERS (REPEATED TRAUMA)
Martin Marietta Northern California Aggregates,LLC · Over-exertion (Not Elsewhere Classified)

Employee is claiming a cummulative trauma to left shoulder, specifically left shoulder rotator cuff tendonitis.

June 22, 2006 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech OTHER
Martin Marietta Northern California Aggregates,LLC · Bodily reaction, (Not Elsewhere Classified)

Employee felt pain in his lower back when he bent over to connect cables from charger to welder battery.

2003 · 1 incident

November 10, 2003 CA · Metal/Non-Metal blaster, shooter, shotfirer, explosive worker, powder gang/monkey OTHER
Hanson Aggregates West Inc · Struck by flying object

EE WAS SHOVELING MATERIAL NEAR ONE OF THE CRUCHERS WHEN THE WIND BLEW DUST INTO HIS EYE.

2002 · 1 incident

April 2, 2002 CA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Hanson Aggregates West Inc · Over-exertion in lifting objects

EE WAS LIFTING SCREEN AND PLACING THEM IN A RACK; HE EXPERIENCED PAIN IN HIS SHOULDER AND NECK.

2000 · 1 incident

March 27, 2000 CA · Metal/Non-Metal greaser, grease man, oiler, lube man, dragline oiler SLIP OR FALL OF PERSON
Hanson Aggregates, Inc. · Fall to the walkway or working surface

EE WAS PULLING ON GREASE LINE FROM SERVICE TRUCKWALKING BACKWARDS AT THE TIME & SLIPPED & FELL ON LOOSE GRAVEL IN AREA-FALLING BACKWARDS ONTO HIS BUTTOCKS. THERE WAS NO DIAGNOSIS UNTIL 4/19/00 FROM DRS.