Mining Incidents

Mapleton Depot Plant Metal/Non-Metal

Controlled by USS Holdings Inc
Mapleton Depot, Huntingdon County, PA  ·  Active
MSHA Mine ID: 3603122

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Fatalities
0
Total incidents
53
Years on record
2000–2025
Latest incident
Dec 2025
Compliance record
MSHA citations since 2000
206
citations
11
significant & substantial
$37,880
proposed penalties
$29,335
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 25,597 3 0 117.2
2025 Q3 8,656 2 0 231.1
2025 Q1 8,357 2 0 239.3
2024 Q4 16,518 0 0 0.0
2024 Q3 26,111 0 0 0.0
2024 Q2 7,869 3 0 381.2
2024 Q1 26,712 0 0 0.0
2023 Q4 15,671 5 0 319.1
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.

Reportable incidents

53 on file

2025 · 2 incidents

December 29, 2025 PA · Metal/Non-Metal master mechanic, foreman, supervisor SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Fall to the walkway or working surface

The employee fell while traversing an irregular surface. They put their arms out to catch themselves and sustained a closed fracture to the left radius and ulna.

October 27, 2025 PA · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

The employee sustained a left forearm laceration while using a pair of scissors as a draw knife to cut scrap cardboard into smaller pieces for disposal. The employee was pulling the scissors toward themselves when the scissors slipped and cut into their forearm, 4" above the wrist and glove, causing a laceration requiring 4 stitches.

2024 · 1 incident

August 29, 2024 PA · Metal/Non-Metal outside foreman, leadman SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Fall onto or against objects

Employee collapsed as a result of a personal medical condition, striking their jaw as they fell. The fall resulted in a chin laceration and temporal bone fracture.

2023 · 1 incident

October 15, 2023 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

Miner was kneeling and using an angle grinder to remove welding slag when the grinder caught and kicked back, striking the miner in the left thigh just above their knee resulting in sutures.

2022 · 1 incident

September 21, 2022 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Struck by flying object

EE using an angle grinder got foreign material in right eye. EE was not using the proper PPE for the task. EE was wearing safety glasses, but did not wear a face shield.

2021 · 1 incident

August 24, 2021 PA · Metal/Non-Metal outside foreman, leadman HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in pulling or pushing objects

Miner was setting the brake on a rail car. Miner was reaching overhead and pulling to rotate the brake wheel when they felt a pull in groin area. Strain resulted in a hernia in the left groin area.

2019 · 2 incidents

August 5, 2019 PA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

Cable for lower flexible step on Volvo A35D Water Truck broke when employee stepped up on it. Employee did not fall to the ground, but strained EE's lower back by holding on and lowering self.

May 27, 2019 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by flying object

Miner was using a sledge hammer to separate a bucket tooth from a shank which had broken off the bucket. On the fourth swing, a small shard of metal broke off the bucket tooth and struck the miner in the left leg below the knee. The metal embedded into the shin.

2018 · 4 incidents

November 22, 2018 PA · Metal/Non-Metal crusher attendant/operator, pan feeder operator/worker HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in lifting objects

Miner was shoveling sand spillage from under tail of conveyor and felt a sharp pain in lower back radiating down left leg. This resulted in a muscle strain which induced the sciatic pain.

November 1, 2018 PA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
U.S. Silica Company, LLC · Struck against a moving object

Miner alleges lower back pain from operation of a front end loader. Reported at 9:00 am 11/1/18...no definitive time of a specific incident.

October 22, 2018 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by flying object

Miner used a drift punch and chisel to remove the top of a bearing block so the bearing could be replaced. A small metal "splinter" from the block penetrated the miners glove and embedded in the 5th finger of the left hand.

March 14, 2018 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Contact with hot objects or substances

Miner was cutting rusted steel with a torch. the miners pant leg had pulled up and was stuck on the tongue of EE's boot. Slag from the work piece entered the top of EE's work boot resulting in a burn.

2017 · 4 incidents

February 22, 2017 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Caught in, under or between a moving and a stationary object

Two maintenance persons were tossing a piece of irregular shaped scrap cast iron pipe into a scrap metal dumpster. Piece caught edge of dumpster and spun and pinched two fingers between pipe and dumpster

February 4, 2017 PA · Metal/Non-Metal miner, prospector, nec SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

Employee slipped on wet, partially icy area and twisted the right knee. Did not fall. Was referred for physical therapy

January 27, 2017 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech DISORDERS (REPEATED TRAUMA)
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

ILLNESS: Carpal Tunnel left hand.

January 3, 2017 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in pulling or pushing objects

Employee unlatched the left rear fender of the L-350 Loader to swing it open. When the employee grabbed the handle and pulled to swing the fender open, EE felt a pulling in right lower back above the pelvis and wrapping around the side to right groin area. Employee also felt a strain/pull in the front of the upper right thigh.

2016 · 4 incidents

May 26, 2016 PA · Metal/Non-Metal ledgeman/hand, quarry man HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

While exiting Cat 385 excavator, the operator noticed the egress ladder was full of heavy mud. The operator attempted to wipe the mud off the ladder by sweeping it with left foot. While doing this, EE felt a sharp stinging pain in left foot. Not reported to supervisor until following day.

January 29, 2016 PA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Fall to the walkway or working surface

While returning from the break room to EE's haul truck, the employee's right foot slipped on a small patch of snow covered ice and fell.

January 20, 2016 PA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator OTHER
U.S. Silica Company, LLC · Bodily reaction, (Not Elsewhere Classified)

Employee was delivering a small sample bottle of sand to the lab and was descending the stairs at the end of the D5 conveyor when EE heard and felt a pop in EE's right knee.

January 13, 2016 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

Employee was removing feed distribution box from Rotex lid. While pulling on upper wrench to loosen the nut, the wrench slipped off and struck employee in lip resulting in laceration to lower lip and chipped top right front tooth.

2015 · 4 incidents

December 22, 2015 PA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer FALL OF FACE/RIB/PILLAR/SIDE/HIGHWALL
U.S. Silica Company, LLC · Struck against a moving object

Employee was using 385 excavator to pull down material from a 50 ft bench. A single 5-6 tn boulder which had been contained within the face of the material above, toppled off the top while the operator was swinging the excavator. The rock struck the tracks first, then upward into the front end of the cab. Case just became reportable when employee needed to seek physical therapy.

September 29, 2015 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Contact with hot objects or substances

Employee was cutting steel angle using a torch. When oxygen was applied, the cut pocketed and returned slag and sparks towards employee. Slag bounced off of worker's cheek, onto his safety glasses and into his right eye.

August 18, 2015 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in lifting objects

Employee was moving seal pump from storage location on floor or storeroom onto a 2 wheel cart in order to transport to a chain hoist. Employee bent over and lifted the pump/motor assembly onto the cart and strained low back.

August 5, 2015 PA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
U.S. Silica Company, LLC · Struck against a moving object

Two Dump trucks hauling on dirt road when 1st truck stopped, 2nd truck did not see due to the dust and struck the rear of 1st truck. Driver of 1st truck momentarily lost consciousness resulting in his truck going over small embankment. The injured employee was taken to hospital and received treatment for cuts on head, broken collar bone & possible concussion. Both trucks disabled.

2014 · 1 incident

November 17, 2014 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Struck by falling object

Employee was preparing to lower a catwalk into place. Employee was under the catwalk holding it in place in the raised position, over center. Another employee removed the bolt which secured the catwalk. The catwalk started to fall unexpectedly before help could get there. Employee pushed the catwalk back over center to raised position which injured back.

2013 · 3 incidents

December 7, 2013 PA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
U.S. Silica Company, LLC · Struck by falling object

Skidsteer operator was picking up rods with the skidsteer and the skidsteer had rolled forward from the pressure of him lifting and when it broke free, some of the rods came off the forks with one striking right foot.

November 4, 2013 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech DISORDERS (REPEATED TRAUMA)
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

EE claims he has Carpal Tunnel based on activities as a mechanic at work.

July 8, 2013 PA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
U.S. Silica Company, LLC · Caught in, under or between (Not Elsewhere Classified)

Employee was changing cutting edge on skid loader bucket with impact wrench and caught his glove and left middle finger on rotating bolt head lacerating finger.

2012 · 3 incidents

December 18, 2012 PA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in lifting objects

Employee was opening 2nd lid on rail car. He lifted the lid with his left hand and felt a sharp pain in his left bicep.

May 16, 2012 PA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in lifting objects

Employee was moving bucket teeth from truck to scrap dumpster. Felt sharp pain in upper back and right arm.

March 9, 2012 PA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by falling object

Operator was trying to close the discharge gate on a rail car using a spike puller. The spike puller slipped out of employees hand and fell on his right foot above steel toe.

2011 · 3 incidents

July 30, 2011 PA · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
U.S. Silica Company, LLC · Struck against a moving object

Employee was driving haul truck on new uneven haul road. Employee woke up the following morning with back pain.

February 3, 2011 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Over-exertion in pulling or pushing objects

Employee was pulling on a wrench to loosen hydraulic tank drain plug and felt a pull in right elbow. Injury was reported on 2/4/11 but first medical treatment was 3/1/11.

January 5, 2011 PA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

On 1/5/11, employee was exiting the CAT 385 and upon stepping from the top step to the second step, it was pushed into the top step. Right leg went to the ground and left leg was stuck on top step, twisting left knee. Injury was reported on 2/23/11. Received Medical Treatment on 3/2/11.

2010 · 4 incidents

November 11, 2010 PA · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

Employee was filling sample jars and needed to replace the jars. The box of jars was on top shelf. When employee pulled the box down, it fell, causing the weight of the box to pull on EE's shoulder. *Note: Jars are filled with sand.

September 23, 2010 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Caught in, under or between a moving and a stationary object

Was guiding a wheel assembly on the spindle shaft of haul truck and assembly shifted. Pinched left index finger between planetary and hub.

July 29, 2010 PA · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer DISORDERS (REPEATED TRAUMA)
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

Seat is a low-back bucket seat & does not support part of the torso. Over the years of operating on uneven surfaces, a numbness in the thumb, forefinger & index finger of both hands has occurred. (Injury has just now became a medical as employee is now receiving medical treatment.)

January 11, 2010 PA · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator MACHINERY
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

While charging mill, one rod did not go in all the way. Operators did not look before starting the next rod. Once the next rod was moving, employee tried to stop it before it hit the rod that did not go in, causing his left knee to twist.

2009 · 1 incident

August 24, 2009 PA · Metal/Non-Metal pumper SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Fall onto or against objects

Employee was stepping off of cement onto black top and fell landing on right knee. This was just a first aid accident until 4-7-10-became LWC accident.

2008 · 2 incidents

December 5, 2008 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

Unloading 1 1/2" round cold rolled steel rods from a truck individually. Each rod was being blocked on one end only. When they went to unload 2nd bar, the load shifted. When this happened, the steel bar struck employees left hand, thus causing his left thumb to be injured.

April 14, 2008 PA · Metal/Non-Metal prep plant foreman, supervisor, mill plant supervisor, kiln supervisor DUST DISEASE OF LUNGS
U.S. Silica Company, LLC · Inhalation of radiations, caustics, toxic and noxious substances

The filing of this report is not to be construed as an admission by the company that an occupational respiratory disease or illness has occurred. Employee is retired as of 4/1/2008. The B readed notification was received 10/15/2008.

2006 · 2 incidents

October 28, 2006 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in pulling or pushing objects

EE was reaching down underneath belt to lift roller out of hanger and while pulling on roller it did not move but shoulder was pulled. He has been treating with a physician but has continued to work per doctor's instructions. Doctor decided to do surgery on 5/1/2007 to repair a torn rotator cuff.

February 1, 2006 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

Employee was removing burnt slag from a piece of metal. While doing this task, a piece of slag entered into employee's right eye.

2005 · 3 incidents

December 16, 2005 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Struck by falling object

Before starting work, EE decided to clean SUV/Explorer of material from day before. When opening rear hatch door, He did not notice motor frame from previous day slid and was resting against hatch door. Once he opened hatch door, the motor fell from vehicle onto his foot. He had not changed into safety shoes. He wanted to clean vehicle before he changed into his ppe.

July 6, 2005 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

The employee was working in a confined area. He was pulling down on the adjustment handle and the upper man was sliding a tool over the adjustment handle. The tool slipped off the adjustment hitting him in the two front teeth.

May 28, 2005 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion in lifting objects

EMPLOYEE WAS LIFTING PLATES FOR MILL END LINERS WHICH RESULTED IN PAIN IN LOWER BACK.

2004 · 2 incidents

November 10, 2004 PA · Metal/Non-Metal quality control technician, laboratory technician, laboratory assistant SLIP OR FALL OF PERSON
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

EE WAS COMING TO WORK AND WENT TO ENTER LAB DOOR. WHEN HE REACHED FOR DOOR HANDLE HE MISSED STEP. HE THEN LANDED ON NEXT STEP WHILE STILL HOLDING ONTO HANDLE. HE THEN FELT PAIN IN HIS LOWER BACK AND HIP AREA. (IMPROPER LANDING AND STEPS CONTRIBUTED TO ACCIDENT.)

June 4, 2004 PA · Metal/Non-Metal ledgeman/hand, quarry man MACHINERY
U.S. Silica Company, LLC · Struck against a moving object

EMPLOYEE WAS PUSHING OVERBURDEN TO EXPOSE SAND PRODUCTION. IN DOING SO, HE FELT AND HAD PAIN IN SPINE AREA. THE DOZER IS ONE OF THE WORST MACHINES RE: JERKING, THUMPING, HARD ON OPERATOR. LOADER CAN BE ROUGH ALSO.

2003 · 1 incident

July 7, 2003 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
U.S. Silica Company, LLC · Over-exertion in wielding or throwing objects

EE WAS SLEDGING OUT OLD BOLT AT RODMILL DISCHARGE AND IN DOING SO HE WAS STANDING IN A CONGESTED AREA AND STRAINED HIS BACK.

2002 · 1 incident

August 28, 2002 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

EE WAS CUTTING STRIPS TO FORM WINDOW FRAME & IN DOING SO HE CUT HIS LEFT POINTER & MIDDLE FINGERS, ALSO BREAKING THE POINTER FINGER. HE WAS PUSHING BOARD THROUGH & REACHED UNDER THE GUARD.

2001 · 1 incident

January 17, 2001 PA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE
U.S. Silica Company, LLC · Struck against a moving object

EE BID QUARRY LARGE LOADER OPERATOR JOB. INTO SECOND WEEK EE TURNED JOB DOWN DUE TO BACK PAIN. THIS JOB IS VERY DIFFICULT BECAUSE OF JOLTING MOTIONS.

2000 · 2 incidents

October 13, 2000 PA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator HANDLING OF MATERIALS
U.S. Silica Company, LLC · Over-exertion (Not Elsewhere Classified)

EE PICKED UP SMALL RODS WITH ANOTHER EE. ROD WAS THROWN INTO BACK OF DUMP TRUCK. EE MOVED FROM RIGHT TO LEFT IN A TWISTING MOTION AND FELT LEFT KNEE POP.

September 16, 2000 PA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech MACHINERY
U.S. Silica Company, LLC · Struck by... (Not Elsewhere Classified)

EMPLOYEE WAS GRINDING EDGES SMOOTH WHERE THEY HAD TORCHED PIECES OUT OF A 2" PIECE OF FLAT STEEL. THE GRINDER GOT CAUGHT IN THE HOLE CAUSING IT TO BE THROWN FROM HIS HANDS THUS CUTTING HIS RIG HT FOREARM.