Key Takeaway
Ridge Rock Quarry is a active surface mine producing SandAndGravel, located in North San Juan, Nevada County, CA. It has 89 violations on record (9 S&S) and $11K in proposed penalties. Operated by Hansen Bros. Enterprises.
Ridge Rock Quarry
Operator: Hansen Bros. Enterprises
Controller: Jeff Hansen
Location: North San Juan, Nevada County, CA
Employees: 2
Recent Violations
View all 89 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 10/28/2025 | 56.14107(a) | Non-S&S | LowNegligence | $151 |
| 01/16/2025 | 50.30(a) | Non-S&S | LowNegligence | $151 |
| 07/23/2024 | 56.9301 | Non-S&S | ModNegligence | $147 |
| 07/23/2024 | 56.12004 | Non-S&S | ModNegligence | $147 |
| 02/21/2024 | 56.15001 | Non-S&S | LowNegligence | $147 |
| 02/21/2024 | 47.44(b) | Non-S&S | ModNegligence | $147 |
| 08/01/2023 | 56.9300 | Non-S&S | ModNegligence | $143 |
| 12/13/2022 | 56.16001 | Non-S&S | ModNegligence | $143 |
| 12/13/2022 | 56.14207 | Non-S&S | ModNegligence | $143 |
| 06/14/2021 | 50.30(a) | Non-S&S | LowNegligence | $125 |
| 06/14/2021 | 50.30(a) | Non-S&S | LowNegligence | $125 |
| 11/04/2020 | 56.9300(b) | Non-S&S | ModNegligence | $123 |
| 02/27/2019 | 56.14109(b)(1) | Non-S&S | LowNegligence | $121 |
| 02/27/2019 | 56.14107(a) | Non-S&S | LowNegligence | $121 |
| 02/27/2019 | 56.12025 | Non-S&S | NoNegligence | $121 |
| 04/12/2017 | 56.11003 | Non-S&S | ModNegligence | $116 |
| 04/12/2017 | 46.9(a) | Non-S&S | ModNegligence | $116 |
| 10/26/2016 | 56.12018 | Non-S&S | ModNegligence | $114 |
| 10/26/2016 | 56.12032 | Non-S&S | ModNegligence | $114 |
| 10/26/2016 | 56.14130(c) | Non-S&S | ModNegligence | $114 |
Accidents & Injuries
View all 1 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 02/20/2023 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 46d restricted |
Inspections
View all 55 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 10/27/2025 | 10/30/2025 | 32.50 | 1 |
| 04/01/2025 | 04/14/2025 | 12.00 | 1 |
| 11/05/2024 | 11/05/2024 | 5.00 | 1 |
| 07/23/2024 | 07/25/2024 | 20.00 | 1 |
| 02/21/2024 | 02/21/2024 | 5.75 | 1 |
| 08/01/2023 | 08/01/2023 | 6.25 | 1 |
| 12/12/2022 | 12/13/2022 | 16.25 | 1 |
| 08/30/2022 | 08/31/2022 | 3.25 | 1 |
| 10/04/2021 | 10/06/2021 | 9.50 | 1 |
| 06/08/2021 | 06/14/2021 | 9.50 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Ridge Rock Quarry have?
Ridge Rock Quarry has 89 MSHA violations on record, of which 9 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $11K.
What type of mine is Ridge Rock Quarry?
Ridge Rock Quarry is a Surface mine producing SandAndGravel, located in North San Juan, Nevada County, CA. It currently has 2 employees.
Has anyone been injured or killed at Ridge Rock Quarry?
According to MSHA records, Ridge Rock Quarry has 1 reported accident/injury records and 0 fatalities on file.
Who operates Ridge Rock Quarry?
Ridge Rock Quarry is operated by Hansen Bros. Enterprises and controlled by Jeff Hansen. MSHA Mine ID: 0405178.