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

Active Surface SandAndGravel

Operator: Twin Mountain Rock Venture

Controller: Eddie Antonini

Location: Little Lake, Inyo County, CA

Employees: 6

160
Violations
40
S&S Violations
6
Accidents
$59K
Penalties

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

MSHA Mine ID0403623
Mine TypeSurface
StatusActive
CommoditySandAndGravel
SIC DescriptionConstruction Sand and Gravel
Employees6
Days/Week5.0
Hours/Shift12.0
Coordinates35.9830560, -117.9119440
Nearest TownLittle Lake

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.