Key Takeaway
Hidden Canyon Quarry is a active surface mine producing SandAndGravel, located in Greenfield, Monterey County, CA. It has 240 violations on record (69 S&S) and $253K in proposed penalties. Operated by San Benito Supply.
Hidden Canyon Quarry
Operator: San Benito Supply
Controller: Mark Schipper; Peter Schipper
Location: Greenfield, Monterey County, CA
Employees: 5
Recent Violations
View all 240 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 01/13/2026 | 56.14112(a)(1) | Non-S&S | LowNegligence | $151 |
| 01/12/2026 | 56.14100(b) | Non-S&S | LowNegligence | $151 |
| 06/05/2025 | 56.20003(b) | S&S | ModNegligence | $1,219 |
| 06/04/2025 | 56.11027 | Non-S&S | ModNegligence | $2,312 |
| 06/04/2025 | 56.14107(a) | Non-S&S | ModNegligence | $7,676 |
| 06/04/2025 | 56.20003(a) | Non-S&S | ModNegligence | $209 |
| 06/04/2025 | 56.11012 | Non-S&S | ModNegligence | $209 |
| 06/04/2025 | 56.14101(a)(2) | Non-S&S | ModNegligence | $209 |
| 06/04/2025 | 56.14100(b) | Non-S&S | ModNegligence | $209 |
| 06/04/2025 | 56.5001(a)/.5005 | S&S | ModNegligence | $1,550 |
| 11/13/2024 | 56.11001 | Non-S&S | ModNegligence | $147 |
| 11/13/2024 | 56.4201 | Non-S&S | ModNegligence | $147 |
| 07/16/2024 | 56.12004 | Non-S&S | ModNegligence | $147 |
| 07/16/2024 | 56.14107(a) | Non-S&S | ModNegligence | $147 |
| 07/16/2024 | 56.14107(a) | S&S | ModNegligence | $204 |
| 07/16/2024 | 56.14107(a) | Non-S&S | ModNegligence | $147 |
| 07/16/2024 | 56.4201(a)(2) | Non-S&S | ModNegligence | $147 |
| 07/16/2024 | 56.14100(b) | S&S | ModNegligence | $453 |
| 07/16/2024 | 56.14132(a) | S&S | HighNegligence | $1,511 |
| 07/16/2024 | 56.12041 | Non-S&S | ModNegligence | $147 |
Accidents & Injuries
View all 13 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 10/16/2025 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 26d restricted |
| 10/05/2023 | MACHINERY | DAYS AWAY FROM WORK ONLY | 15d lost |
| 03/10/2023 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 10d restricted |
| 01/18/2023 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 02/23/2022 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 13d restricted |
| 02/18/2022 | HANDLING OF MATERIALS | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 08/17/2020 | HANDLING OF MATERIALS | DYS AWY FRM WRK & RESTRCTD ACT | None |
| 04/30/2019 | MACHINERY | NO DYS AWY FRM WRK,NO RSTR ACT | None |
| 04/18/2019 | SLIP OR FALL OF PERSON | DYS AWY FRM WRK & RESTRCTD ACT | 60d lost, 215d restricted |
| 04/05/2019 | DISORDERS (REPEATED TRAUMA) | OCCUPATNAL ILLNESS NOT DEG 1-6 | None |
Inspections
View all 55 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 01/12/2026 | 01/13/2026 | 23.50 | 1 |
| 09/02/2025 | 09/03/2025 | 20.00 | 1 |
| 08/05/2025 | 08/06/2025 | 12.25 | 1 |
| 06/23/2025 | 06/23/2025 | 6.50 | 1 |
| 06/09/2025 | 06/11/2025 | 5.00 | 1 |
| 06/04/2025 | 06/05/2025 | 25.75 | 1 |
| 11/14/2024 | 11/14/2024 | 8.25 | 1 |
| 11/13/2024 | 11/14/2024 | 13.25 | 1 |
| 08/05/2024 | 08/07/2024 | 2.00 | 1 |
| 07/15/2024 | 07/16/2024 | 15.25 | 1 |
Mine Details
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Frequently Asked Questions
How many MSHA violations does Hidden Canyon Quarry have?
Hidden Canyon Quarry has 240 MSHA violations on record, of which 69 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $253K.
What type of mine is Hidden Canyon Quarry?
Hidden Canyon Quarry is a Surface mine producing SandAndGravel, located in Greenfield, Monterey County, CA. It currently has 5 employees.
Has anyone been injured or killed at Hidden Canyon Quarry?
According to MSHA records, Hidden Canyon Quarry has 13 reported accident/injury records and 0 fatalities on file.
Who operates Hidden Canyon Quarry?
Hidden Canyon Quarry is operated by San Benito Supply and controlled by Mark Schipper; Peter Schipper. MSHA Mine ID: 0405653.