Twin Mountain Rock Venture · Accident type, without injuries
Slid off a sluff bank and turned over dozer. Material kept the dozer in almost like slow motion. No injury windows came out whole, and back one stayed in.
Twin Mountain Rock Metal/Non-Metal
Twin Mountain Rock Venture
· Surface
Controlled by
Eddie Antonini
Little Lake,
Inyo County,
CA
·
Active
MSHA Mine ID: 0403623
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- Fatalities
- 0
- Total incidents
- 6
- Years on record
- 2006–2021
- Latest incident
- Jun 2021
Compliance record
MSHA citations since 2000
160
citations
40
significant & substantial
$59,294
proposed penalties
$48,227
paid to date
Source: MSHA violations data, updated weekly.
Quarterly safety rates
Citations per million employee-hours, as reported to MSHA
| Quarter | Hours worked | Citations | S&S | Per 1M hrs |
|---|---|---|---|---|
| 2025 Q4 | 2,268 | 0 | 0 | 0.0 |
| 2025 Q1 | 1,796 | 1 | 0 | 556.8 |
| 2024 Q3 | 1,954 | 9 | 1 | 4605.9 |
| 2024 Q1 | 1,873 | 1 | 0 | 533.9 |
| 2023 Q4 | 1,764 | 0 | 0 | 0.0 |
| 2023 Q2 | 2,422 | 3 | 2 | 1238.6 |
| 2023 Q1 | 1,764 | 0 | 0 | 0.0 |
| 2022 Q4 | 2,245 | 3 | 0 | 1336.3 |
Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
No fatalities recorded at this mine.
Reportable incidents
6 on file2021 · 1 incident
2015 · 1 incident
June 4, 2015
CA · Metal/Non-Metal
laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman
HANDLING OF MATERIALS
Twin Mountain Rock Venture · Caught in, under or between (Not Elsewhere Classified)
While working on #27 conveyor employees hand got caught in between the stand holding the conveyor and the conveyor. Machine being used to hold conveyor bled off pinching employees left hand below pinkie finger.
2013 · 1 incident
January 15, 2013
CA · Metal/Non-Metal
warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator
MACHINERY
Cemex Construction Materials LP · Struck by... (Not Elsewhere Classified)
Hose came loose from air wrench and struck employee above the left eye, lacerating the scalp and knocking off his safety glasses.
2008 · 1 incident
June 23, 2008
CA · Metal/Non-Metal
warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator
HANDLING OF MATERIALS
Rinker Materials Western Inc · Struck against stationary object
Worker cut finger while working on D8N dozer. Required seven stitches. Returned to work same day limited duty.
2007 · 1 incident
Rinker Materials Western Inc · Struck by... (Not Elsewhere Classified)
Employee was working on shaker screen. He had lifted and secured a discharge lip on the top deck of the screen so that he could work on the second deck of the screen. After climbing into begin work on the screen a gust of wind caused the discharge lip above him to fall. The lip struck the employee on the back and caused him to hit his chest on the deck in front of him.
2006 · 1 incident
May 22, 2006
CA · Metal/Non-Metal
beltman, conveyor man, conveyor belt worker, mobile bridge carrierman, feeder operator, conveyor rider
SLIP OR FALL OF PERSON
Rinker Materials Western Inc · Fall to the walkway or working surface
Employee was running to turn off conveyor belt when he slipped and fell. The employee received a lower back strain from the fall.