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Penrose Ranch Gravel Pit Metal/Non-Metal

Martin Marietta Materials Inc. · Surface

Controlled by Martin Marietta Materials Inc

Florence, Fremont County, CO · Active

MSHA Mine ID: 0504509

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Fatalities: 0
Total incidents: 1
Years on record: 2016
Latest incident: Nov 2016

Compliance record

MSHA citations since 2000

124

citations

significant & substantial

$37,002

proposed penalties

$30,796

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	3,461	2	577.9
2025 Q3	3,293	0	0.0
2025 Q2	4,812	2	415.6
2025 Q1	5,493	0	0.0
2024 Q4	4,444	0	0.0
2024 Q1	4,998	1	200.1
2023 Q4	6,256	0	0.0
2023 Q3	1,196	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

2016 · 1 incident

November 15, 2016 CO · Metal/Non-Metal front-end loader, scraper-loader operator, pan operator, payloader, scraper rig operator STEPPING OR KNEELING ON OBJECT

Martin Marietta Materials Inc. · Struck against stationary object

Employee was climbing up the ladder on the loader on the pit floor when ee felt a slight pull in the back area on the right leg just above the knee. Employee then climbed down and notified supervisor about the incident that had just happened.