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ROSEMARY'S MOUNTAIN QUARRY Metal/Non-Metal

HORIZON HILL MATERIALS, LLC · Surface

Controlled by Keeley RMQ LLC; Horizon Hill Materials RMQ LLC

Pala, San Diego County, CA · Active

MSHA Mine ID: 0405683

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Email me when a new MSHA incident is filed at ROSEMARY'S MOUNTAIN QUARRY.

Fatalities: 0
Total incidents: 1
Years on record: 2021
Latest incident: Jul 2021

Compliance record

MSHA citations since 2008

citations

significant & substantial

$11,188

proposed penalties

$10,557

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	52	0	0	0.0
2025 Q3	4	0	0	0.0
2025 Q2	264	0	0	0.0
2024 Q2	720	0	0	0.0
2024 Q1	1,024	0	0	0.0
2023 Q3	0	2	2
2023 Q1	0	0	0
2022 Q3	0	0	0

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

2021 · 1 incident

July 19, 2021 CA · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator POWERED HAULAGE

Chandler Aggregates Inc. · Struck against a moving object

Loader operator shook the bucket to confirm no residual material was in EE's bucket. The machine shaking aggravated an existing back condition. The operator finished the shift and departed the mine site without notifying the supervisor of EE's injury.