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Ridge Rock Quarry Metal/Non-Metal

Hansen Bros. Enterprises · Surface

Controlled by Jeff Hansen

North San Juan, Nevada County, CA · Active

MSHA Mine ID: 0405178

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Email me when a new MSHA incident is filed at Ridge Rock Quarry.

Fatalities: 0
Total incidents: 1
Years on record: 2023
Latest incident: Feb 2023

Compliance record

MSHA citations since 2000

citations

significant & substantial

$11,197

proposed penalties

$11,197

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	Per 1M hrs
2025 Q4	2,094	1	477.6
2025 Q3	4,088	0	0.0
2025 Q2	3,072	1	325.5
2025 Q1	2,087	0	0.0
2024 Q4	1,797	0	0.0
2024 Q3	1,800	2	1111.1
2024 Q2	2,446	0	0.0
2024 Q1	2,458	2	813.7

Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.

No fatalities recorded at this mine.

Reportable incidents

1 on file

2023 · 1 incident

February 20, 2023 CA · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON

Hansen Bros. Enterprises · Fall from machine

Climbing onto loader to work on the engine. Slipped and fell onto left shoulder & left chest.