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Plant 21 Metal/Non-Metal

Milestone Materials · Surface

Controlled by Mathy Construction Company

Neillsville, WI, Clark County, WI · Intermittent

MSHA Mine ID: 4703395

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Email me when a new MSHA incident is filed at Plant 21.

Fatalities: 0
Total incidents: 1
Years on record: 2019
Latest incident: Jul 2019

Compliance record

MSHA citations since 2005

149

citations

significant & substantial

$39,078

proposed penalties

$39,078

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	891	0	0.0
2025 Q3	1,786	1	559.9
2025 Q2	1,149	0	0.0
2025 Q1	1	0	0.0
2024 Q4	996	0	0.0
2024 Q3	1,881	0	0.0
2024 Q2	1,403	0	0.0
2024 Q1	1	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

2019 · 1 incident

July 9, 2019 WI · Metal/Non-Metal maintenance man, mechanic, repair/serviceman, boilermaker, fueler, tire tech, field service tech SLIP OR FALL OF PERSON

Opelt Sand & Gravel · Struck against stationary object

Technician was looking for an oil leak on the front of a generator engine and had the guards removed to better see the area in question. Technician stood up from the floor level after looking at the leak, lost balance, and got hand struck by the engine fan.