Riverdale Quarry
Intermittent
Surface
Stone
Operator: Riverdale Quarry LLC
Controller: Roger Mahan; Gary Mahan
Location: Riverdale, Morris County, NJ
Employees: 57
121
Violations
19
S&S Violations
22
Accidents
$17K
Penalties
Recent Violations
View all 121 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/28/2026 | 56.18002(b) | Non-S&S | HighNegligence | $0 |
| 04/20/2023 | 56.4101 | Non-S&S | ModNegligence | $143 |
| 12/21/2022 | 50.30(a) | Non-S&S | LowNegligence | $143 |
| 12/21/2022 | 50.30(a) | Non-S&S | LowNegligence | $143 |
| 12/21/2022 | 50.30(a) | Non-S&S | LowNegligence | $143 |
| 12/21/2022 | 50.30(a) | Non-S&S | LowNegligence | $143 |
| 12/20/2022 | 56.11001 | Non-S&S | ModNegligence | $143 |
| 12/20/2022 | 56.14131(a) | S&S | LowNegligence | $167 |
| 07/19/2022 | 56.13015(a) | Non-S&S | LowNegligence | $133 |
| 07/13/2022 | 56.11001 | Non-S&S | ModNegligence | $133 |
| 07/12/2022 | 56.4201(a)(2) | Non-S&S | LowNegligence | $133 |
| 12/16/2021 | 56.14103(b) | S&S | ModNegligence | $133 |
| 12/16/2021 | 56.4201(a)(2) | Non-S&S | ModNegligence | $133 |
| 12/15/2021 | 56.9300(a) | Non-S&S | ModNegligence | $133 |
| 12/15/2021 | 56.9301 | S&S | ModNegligence | $133 |
| 08/03/2021 | 56.14103(b) | S&S | ModNegligence | $302 |
| 08/03/2021 | 56.11001 | S&S | ModNegligence | $302 |
| 08/03/2021 | 56.14101(a)(2) | Non-S&S | ModNegligence | $125 |
| 07/29/2021 | 56.14112(a)(1) | Non-S&S | ModNegligence | $125 |
| 03/02/2021 | 56.14132(a) | Non-S&S | ModNegligence | $125 |
Accidents & Injuries
View all 22 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 08/25/2025 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 4d lost, 84d restricted |
| 04/06/2022 | SLIP OR FALL OF PERSON | DAYS AWAY FROM WORK ONLY | 13d lost |
| 01/20/2021 | POWERED HAULAGE | DAYS RESTRICTED ACTIVITY ONLY | 19d restricted |
| 07/07/2020 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 08/20/2018 | POWERED HAULAGE | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/20/2015 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 11/20/2013 | HANDLING OF MATERIALS | DYS AWY FRM WRK & RESTRCTD ACT | 23d lost, 3d restricted |
| 07/21/2011 | FIRE | ACCIDENT ONLY | None |
| 09/23/2010 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 3d restricted |
| 04/29/2010 | SLIP OR FALL OF PERSON | NO DYS AWY FRM WRK,NO RSTR ACT | None |
Inspections
View all 69 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/28/2026 | 02/13/2026 | 14.00 | 1 |
| 08/07/2025 | 08/07/2025 | 4.50 | 1 |
| 12/11/2024 | 12/11/2024 | 8.50 | 1 |
| 01/04/2024 | 01/04/2024 | 11.50 | 1 |
| 04/20/2023 | 04/20/2023 | 10.00 | 1 |
| 12/20/2022 | 12/21/2022 | 20.00 | 1 |
| 07/11/2022 | 07/19/2022 | 35.25 | 1 |
| 12/15/2021 | 01/04/2022 | 34.75 | 1 |
| 07/29/2021 | 09/28/2021 | 29.00 | 1 |
| 06/22/2021 | 07/26/2021 | 15.50 | 1 |
Mine Details
MSHA Mine ID2800001
Mine TypeSurface
StatusIntermittent
CommodityStone
SIC DescriptionCrushed, Broken Granite
Employees57
Days/Week5.0
Hours/Shift8.0
Coordinates40.9983330, -74.3077780
Nearest TownRiverdale
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Frequently Asked Questions
How many MSHA violations does Riverdale Quarry have?
Riverdale Quarry has 121 MSHA violations on record, of which 19 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $17K.
What type of mine is Riverdale Quarry?
Riverdale Quarry is a Surface mine producing Stone, located in Riverdale, Morris County, NJ. It currently has 57 employees.
Has anyone been injured or killed at Riverdale Quarry?
According to MSHA records, Riverdale Quarry has 22 reported accident/injury records and 0 fatalities on file.
Who operates Riverdale Quarry?
Riverdale Quarry is operated by Riverdale Quarry LLC and controlled by Roger Mahan; Gary Mahan. MSHA Mine ID: 2800001.