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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

ROSEMARY'S MOUNTAIN QUARRY has $11K in proposed MSHA penalties and $0 outstanding across 5 contested dockets, plus health sampling and the full incident record.

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Fatalities

0

Total incidents

1

Years on record

2021

Latest incident

Jul 2021

Compliance record

MSHA citations since 2008

42

citations

18

significant & substantial

$11,188

proposed penalties

$10,557

paid to date

94% of proposed penalties paid to date, a $631 gap.

Source: MSHA violations data, updated weekly.

Inspection activity

MSHA inspections since 2008

37

inspections on record

441

inspection hours

n/a

citations per 100 inspection hours

ⓘ

This rate is recorded citations divided by MSHA inspection hours, per 100 hours. It reflects inspection effort, not mine size or production.

Rate withheld: 441 inspection hours is too few for a stable rate. A minimum of 1,000 inspection hours is required.

Source: MSHA inspections data, updated weekly.

ROSEMARY'S MOUNTAIN QUARRY has $11K in proposed MSHA penalties and $0 outstanding across 5 contested dockets.

Penalty disposition

ⓘ

Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.

$11K

proposed penalties

$11K

current assessed

$11K

paid to date

$0

outstanding

41 assessments are final orders; 5 contested dockets.

As of the most recent assessment on 2026-02-20.

Source: MSHA assessed-violations and conference/litigation data, updated weekly.

Quarterly safety rates

ⓘ

Citations per million reported employee-hours. Rates begin in 2000, when MSHA's quarterly employment data starts; earlier incidents are counted but cannot be rate-adjusted. 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
2025 Q4	52	0	0	0.0
2025 Q3	4	0	0	0.0
2025 Q2	272	0	0	0.0
2025 Q1	386	0	0	0.0
2024 Q4	520	0	0	0.0
2024 Q3	520	2	0	3846.2
2024 Q2	1,232	0	0	0.0
2024 Q1	1,024	0	0	0.0

Show 60 earlier quarters Hide earlier quarters

Quarter	Hours worked	Citations	S&S	Per 1M hrs
2023 Q3	0	2	2
2023 Q1	0	0	0
2022 Q3	0	0	0
2022 Q2	481	0	0	0.0
2022 Q1	2,809	2	1	712.0
2021 Q4	3,490	0	0	0.0
2021 Q3	4,232	0	0	0.0
2021 Q2	4,674	1	0	213.9
2021 Q1	4,860	0	0	0.0
2020 Q4	4,664	2	0	428.8
2020 Q3	4,806	1	0	208.1
2020 Q2	4,911	0	0	0.0
2020 Q1	4,566	0	0	0.0
2019 Q4	3,211	0	0	0.0
2019 Q3	2,524	0	0	0.0
2019 Q2	3,753	0	0	0.0
2019 Q1	3,118	0	0	0.0
2018 Q4	2,905	0	0	0.0
2018 Q3	3,266	0	0	0.0
2018 Q2	3,069	0	0	0.0
2018 Q1	3,811	0	0	0.0
2017 Q4	3,398	1	1	294.3
2017 Q3	3,490	4	1	1146.1
2017 Q2	3,748	0	0	0.0
2017 Q1	2,808	3	1	1068.4
2016 Q4	1,125	0	0	0.0
2016 Q3	2,043	0	0	0.0
2016 Q2	2,197	0	0	0.0
2016 Q1	1,592	0	0	0.0
2015 Q4	997	0	0	0.0
2015 Q3	870	0	0	0.0
2015 Q2	1,077	0	0	0.0
2015 Q1	1,158	0	0	0.0
2014 Q4	579	0	0	0.0
2014 Q2	113	0	0	0.0
2014 Q1	684	0	0	0.0
2013 Q4	1,082	0	0	0.0
2013 Q3	656	0	0	0.0
2013 Q2	1,757	1	1	569.2
2013 Q1	1,320	0	0	0.0
2012 Q4	400	0	0	0.0
2012 Q3	520	0	0	0.0
2012 Q2	671	0	0	0.0
2012 Q1	711	0	0	0.0
2011 Q4	1,331	1	0	751.3
2011 Q3	2,577	0	0	0.0
2011 Q2	2,283	1	1	438.0
2011 Q1	1,712	0	0	0.0
2010 Q4	1,713	0	0	0.0
2010 Q3	1,770	0	0	0.0
2010 Q2	1,969	2	2	1015.7
2010 Q1	1,608	1	0	621.9
2009 Q4	1,551	0	0	0.0
2009 Q3	3,252	6	5	1845.0
2009 Q2	2,138	0	0	0.0
2009 Q1	5,077	1	0	197.0
2008 Q4	1,382	0	0	0.0
2008 Q3	918	3	1	3268.0
2008 Q2	1,146	2	0	1745.2
2008 Q1	240	0	0	0.0

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.

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