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Sioux Rock Quarry Metal/Non-Metal

Martin Marietta Materials Inc. · Surface

Controlled by Martin Marietta Materials Inc

Comfery, Brown County, MN · Intermittent

MSHA Mine ID: 2103504

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Fatalities: 0
Total incidents: 1
Years on record: 2015
Latest incident: Jan 2015

Compliance record

MSHA citations since 2005

citations

significant & substantial

$598

proposed penalties

$598

paid to date

Source: MSHA violations data, updated weekly.

Quarterly safety rates

Citations per million employee-hours, as reported to MSHA

Quarter	Hours worked	Per 1M hrs
2025 Q4	0
2025 Q3	70	0.0
2020 Q4	172	0.0
2020 Q3	330	0.0
2020 Q1	35	0.0
2019 Q4	1	0.0
2019 Q2	363	0.0
2019 Q1	43	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

2015 · 1 incident

January 5, 2015 MN · Metal/Non-Metal warehouseman, bagger, palletizer/stacker, store keeper, packager, fabricator, cleaning plant operator DISORDERS (REPEATED TRAUMA)

Minnesota Paving & Materials · (Not Elsewhere Classified)

Recordable hearing loss.