Key Takeaway
Twin Mountain Rock is a active surface mine producing SandAndGravel, located in Little Lake, Inyo County, CA. It has 160 violations on record (40 S&S) and $59K in proposed penalties. Operated by Twin Mountain Rock Venture.
Twin Mountain Rock
Operator: Twin Mountain Rock Venture
Controller: Eddie Antonini
Location: Little Lake, Inyo County, CA
Employees: 6
Recent Violations
View all 160 →| Date | Section | S&S | Negligence | Penalty |
|---|---|---|---|---|
| 02/11/2026 | 46.3(b)(4) | Non-S&S | HighNegligence | $0 |
| 03/11/2025 | 56.12032 | Non-S&S | LowNegligence | $151 |
| 08/07/2024 | 56.14107(a) | Non-S&S | LowNegligence | $147 |
| 08/07/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 08/07/2024 | 56.14207 | Non-S&S | ModNegligence | $147 |
| 08/07/2024 | 56.12004 | Non-S&S | LowNegligence | $147 |
| 08/07/2024 | 56.12032 | S&S | LowNegligence | $147 |
| 08/07/2024 | 56.12002 | Non-S&S | LowNegligence | $147 |
| 08/07/2024 | 56.12018 | Non-S&S | LowNegligence | $147 |
| 08/07/2024 | 47.31(a) | Non-S&S | ModNegligence | $147 |
| 08/07/2024 | 46.3(b) | Non-S&S | ModNegligence | $147 |
| 03/06/2024 | 56.11002 | Non-S&S | LowNegligence | $147 |
| 05/10/2023 | 56.12008 | S&S | LowNegligence | $167 |
| 05/10/2023 | 56.12002 | Non-S&S | ModNegligence | $143 |
| 05/10/2023 | 56.14100(c) | S&S | LowNegligence | $167 |
| 12/08/2022 | 56.12018 | Non-S&S | LowNegligence | $143 |
| 12/08/2022 | 56.14112(a)(1) | Non-S&S | LowNegligence | $143 |
| 12/08/2022 | 56.14112(a)(1) | Non-S&S | LowNegligence | $143 |
| 07/20/2022 | 56.4102 | Non-S&S | LowNegligence | $133 |
| 07/20/2022 | 56.4102 | Non-S&S | LowNegligence | $133 |
Accidents & Injuries
View all 6 →| Date | Classification | Injury | Days Lost |
|---|---|---|---|
| 06/07/2021 | MACHINERY | ACCIDENT ONLY | None |
| 06/04/2015 | HANDLING OF MATERIALS | DAYS AWAY FROM WORK ONLY | 270d lost |
| 01/15/2013 | MACHINERY | DAYS RESTRICTED ACTIVITY ONLY | 5d restricted |
| 06/23/2008 | HANDLING OF MATERIALS | DAYS RESTRICTED ACTIVITY ONLY | 4d restricted |
| 01/16/2007 | OTHER | DAYS RESTRICTED ACTIVITY ONLY | 7d restricted |
| 05/22/2006 | SLIP OR FALL OF PERSON | DAYS RESTRICTED ACTIVITY ONLY | 4d restricted |
Inspections
View all 77 →| Begin | End | Hours | Inspectors |
|---|---|---|---|
| 02/09/2026 | 02/11/2026 | 22.00 | 1 |
| 07/21/2025 | 07/22/2025 | 19.50 | 1 |
| 03/10/2025 | 03/11/2025 | 14.50 | 1 |
| 08/20/2024 | 08/20/2024 | 2.75 | 1 |
| 08/07/2024 | 08/07/2024 | 11.25 | 1 |
| 03/06/2024 | 03/06/2024 | 12.75 | 1 |
| 05/09/2023 | 05/11/2023 | 13.75 | 1 |
| 12/07/2022 | 12/08/2022 | 21.00 | 1 |
| 07/26/2022 | 07/26/2022 | 3.75 | 1 |
| 07/20/2022 | 07/20/2022 | 9.25 | 1 |
Mine Details
Related Mines
Frequently Asked Questions
How many MSHA violations does Twin Mountain Rock have?
Twin Mountain Rock has 160 MSHA violations on record, of which 40 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $59K.
What type of mine is Twin Mountain Rock?
Twin Mountain Rock is a Surface mine producing SandAndGravel, located in Little Lake, Inyo County, CA. It currently has 6 employees.
Has anyone been injured or killed at Twin Mountain Rock?
According to MSHA records, Twin Mountain Rock has 6 reported accident/injury records and 0 fatalities on file.
Who operates Twin Mountain Rock?
Twin Mountain Rock is operated by Twin Mountain Rock Venture and controlled by Eddie Antonini. MSHA Mine ID: 0403623.