Mining Incidents

Riverdale Quarry Metal/Non-Metal

Controlled by Roger Mahan; Gary Mahan
Riverdale, Morris County, NJ  ·  Intermittent
MSHA Mine ID: 2800001

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Fatalities
0
Total incidents
22
Years on record
2000–2025
Latest incident
Aug 2025
Compliance record
MSHA citations since 2000
121
citations
19
significant & substantial
$17,570
proposed penalties
$16,718
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 5,833 0 0 0.0
2025 Q3 705 0 0 0.0
2025 Q2 405 0 0 0.0
2025 Q1 2,084 0 0 0.0
2024 Q4 1,349 0 0 0.0
2024 Q3 3,830 0 0 0.0
2024 Q1 534 0 0 0.0
2023 Q4 5,540 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

22 on file

2025 · 1 incident

2022 · 1 incident

April 6, 2022 NJ · Metal/Non-Metal weighman, scale person SLIP OR FALL OF PERSON
Tilcon New York Inc · Fall to the walkway or working surface

While entering the scale house the employee tripped stepping over the threshold falling on EE's left side.

2021 · 1 incident

January 20, 2021 NJ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator POWERED HAULAGE
Tilcon New York Inc · Struck by... (Not Elsewhere Classified)

While operating the JLG man-lift the employee used the safety gate to pull self upright. The gate swung open and hit the employee in the face causing a broken nose and laceration needing stitches.

2020 · 1 incident

July 7, 2020 NJ · Metal/Non-Metal utility man, shift tech, service/dump truck operator HANDLING OF MATERIALS
Tilcon New York Inc · Caught in, under or between a moving and a stationary object

While replacing a lift cylinder on a haul truck the associate's right middle finger was pinched against the frame causing a small fracture in the tip of the finger.

2018 · 1 incident

August 20, 2018 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Tilcon New York Inc · Caught in, under or between running or meshing objects

Employee was attempting to push in a skirt rubber that had popped out. EE used a pry bar to push the rubber back in place and inadvertently made contact with the moving conveyor belt causing the bar to spin and pinch their finger between the bar and the chute. A few stitches received to tip of right middle finger.

2015 · 1 incident

February 20, 2015 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Tilcon New York Inc · Struck by... (Not Elsewhere Classified)

employee was attempting to repair a diesel/electric heater. while trying to remove small air line he slipped and his right hand went into the energized fan blade causing a laceration/broken bone and damage to tendon on pointer finger, and lacerations on middle and ring finger.

2013 · 1 incident

November 20, 2013 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Tilcon New York Inc · Over-exertion in lifting objects

Employee states he strained his back while shoveling out the crusher. Employee did not report the injury at time of incident, then went for treatment on 11/20/13 and then reported it to plant manager on 11/25/13 claiming he had the injury two weeks prior. Utilizing 11/20/13 as date of injury based on first medical visit.

2011 · 1 incident

July 21, 2011 NJ · Metal/Non-Metal FIRE
Tilcon New York Inc · Accident type, without injuries

Fire started inside the heavy equipment shop. The fire began with the 2006 Kawasaki 115 Z-V Frontend Wheel Loader. It is believed that the cause of the fire was an electrical short on the loader. An investigation will be performed by Kawasaki Rep. Loader heavily damaged, shop minor damages.

2010 · 2 incidents

September 23, 2010 NJ · Metal/Non-Metal welder (shop) SLIP OR FALL OF PERSON
Tilcon New York Inc · Fall from machine

Miner was removing a troughing idler from a conveyor and as the idler was being pulled out from the belt, the idler frame got caught on the miner's lanyard causing him to lose balance. The employee fell approximately 5 feet landing on conveyor and chute work below. 6 stitches to chin some light bruising.

April 29, 2010 NJ · Metal/Non-Metal bulldozer operator, universal operator, heavy equipment operator, operating engineer SLIP OR FALL OF PERSON
Tilcon New York Inc · Fall from machine

While cleaning the windows on loader, the employee was outside the handrailing, attempting to step on the front fender. The employee misjudged the distance and slipped on the sloped part of the fender, falling to the ground.

2009 · 2 incidents

May 13, 2009 NJ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Tilcon New York Inc · Caught in, under or between (Not Elsewhere Classified)

While adjusting crusher, EE pinched his finger on the cylinder of adjusting ram.

April 29, 2009 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Tilcon New York Inc · Struck by... (Not Elsewhere Classified)

Employee was installing a bucket tooth retainer pin on bucket using an 8 lb sledge hammer when he struck his thumb.

2008 · 1 incident

November 22, 2008 NJ · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver POWERED HAULAGE
Tilcon New York Inc · Struck against a moving object

Employee alleges while driving haul truck, he had pain in his neck and shoulder.

2006 · 2 incidents

March 22, 2006 NJ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator POWERED HAULAGE
Tilcon New York Inc · Caught in, under or between running or meshing objects

Carrying a shovel near a conveyor, employee turned and belt grabbed shovel causing employee's arm to be dragged onto conveyor.

March 21, 2006 NJ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator SLIP OR FALL OF PERSON
Tilcon New York Inc · Fall from scaffolds, walkways, platforms

Employee stepped on pillar to check belt, he slipped off pillar and fell to ground. He sustained knee and back strain injuries. Knee was not healing, referred for surgery on 5/30/06.

2004 · 1 incident

September 15, 2004 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDLING OF MATERIALS
Tilcon New York Inc · Struck by falling object

Employee rested radiator cover on frame of vehicle, the cover slipped, striking the employee's hand.

2002 · 2 incidents

July 31, 2002 NJ · Metal/Non-Metal welder (shop) OTHER
Tilcon New York Inc · Contact with hot objects or substances

EE WAS WELDING ON A PIECE OF HEAVY EQUIPMENT ON A HOT, HUMID DAY. OUTSIDE TEMPERATURE EXCEEDED 95 DEG. EE HAD SCARRING ON BOTH LEGS FROM AN ACCIDENT BACK IN EARLY 1980'S. THE BURN/SCARRING BEC AME AGGRAVATED FROM THE HIGH HEAT AND HUMIDITY. EE'S LEGS BEGAN BLEEDING AND SUSTAINED BLISTERS.

July 9, 2002 NJ · Metal/Non-Metal mine manager, mine foreman, mine owner HANDTOOLS (NONPOWERED)
Tilcon New York Inc · Struck by rolling or sliding object

EE WAS UNJAMMING A MATERIAL CHUTE. EE PULLED OUT A ROCK. WHEN THE FIRST ROCK BECAME DISLODGED, A 2ND ROCK ALSO WAS FREED UP WHICH ROLLED DOWN STRIKING EE'S INDEX FINGER ON RIGHT HAND. EE RECEI VED 10 STITCHES.

2001 · 2 incidents

May 31, 2001 NJ · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS
Tilcon New York Inc · Struck by... (Not Elsewhere Classified)

EE WAS STRUCK BY A ROCK ON THE RIGHT THUMB.

February 14, 2001 NJ · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator HANDTOOLS (NONPOWERED)
Tilcon New York Inc · Caught in, under or between (Not Elsewhere Classified)

EE WAS WORKING IN FEEDER ON JAW PLANT FITTING STEEL PLATES. HE WAS USING A PRY BAR. PRY BAR SLIPPED AND PINCHED HIS LEFT HAND AGAINST WALL OF FEEDER.

2000 · 2 incidents

April 27, 2000 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech HANDTOOLS (NONPOWERED)
Tilcon New York Inc · Struck against stationary object

EE WAS BREAKING LOOSE THE ELECTRIC BOLTS ON CRUSHER #2 WHEN THE RATCHET THAT HE WAS USING SKIPPED CAUSING EE TO SLIP FORWARD STRIKING HIS RIGHT ARM AND NOSE ON THE SOCKET SEALING RING.

January 11, 2000 NJ · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech POWERED HAULAGE
Tilcon New York Inc · Caught in, under or between (Not Elsewhere Classified)

EMPLOYEE WAS CHECKING BELT TENSION ON SCREEN. SCREEN WAS JUST SHUT OFF BUT WAS STILL ROLLING ON HIGH SIDE OF ECENTRIC. EMPLOYEE REACHED AROUND GUARD TO CHECK BELT AS THE ECENTRIC ROLLED CATCH ING HIS HAND BETWEEN BELTS AND SHEAVES.