Mining Incidents

Mount Santa Rosa Quarry Metal/Non-Metal

Controlled by Mitsubishi Corp
Yigo, Guam County, GU  ·  Abandoned
MSHA Mine ID: 6600010

Mount Santa Rosa Quarry has no reportable incidents on file with MSHA.

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Fatalities
0
Total incidents
0
Years on record
—
Latest incident
—
Ownership history
  1. Hawaiian Rock Products 2015 to present
Source: MSHA controller and operator history, updated weekly.
Workforce and production
Year Employees
2026 0
2025 0
2024 0
2023 0
2022 0
2021 0
Source: MSHA quarterly employment and production, updated weekly; years before 2000 come from MSHA's archived Part 50 employment files.
Quarterly safety rates
ⓘ Citations per million reported employee-hours. Rates begin in 2000; earlier incidents are counted but not rate-adjusted, though reported hours reach back to 1983. Quarters under 100,000 reported hours are greyed: too few hours for a stable rate.
Citations per million employee-hours, as reported to MSHA
Quarter Hours worked Citations S&S Per 1M hrs
2026 Q1 0 0 0
2025 Q4 0 0 0
2025 Q3 0 0 0
2025 Q2 0 0 0
2025 Q1 0 0 0
2024 Q4 0 0 0
2024 Q3 0 0 0
2024 Q2 0 0 0
Show 10 earlier quarters
Quarter Hours worked Citations S&S Per 1M hrs
2024 Q1 0 0 0
2023 Q4 0 0 0
2023 Q3 0 0 0
2023 Q2 0 0 0
2023 Q1 0 0 0
2022 Q4 0 0 0
2022 Q3 0 0 0
2022 Q2 0 0 0
2022 Q1 0 0 0
2021 Q4 0 0 0

No reportable incidents on file.

MSHA has no recorded reportable accidents for this mine in the current dataset. New reports appear here within a week of being filed.