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Plant #20 Metal/Non-Metal

River City Stone Division Of Mathy Construction Co · Surface

Controlled by Mathy Construction Company

Dubuque, Dubuque County, IA · Intermittent

MSHA Mine ID: 1302134

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Email me when a new MSHA incident is filed at Plant #20.

Fatalities: 0
Total incidents: 3
Years on record: 2001–2017
Latest incident: Oct 2017

Compliance record

MSHA citations since 2001

citations

significant & substantial

$2,494

proposed penalties

$2,494

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	508	0	0.0
2025 Q2	903	0	0.0
2025 Q1	420	0	0.0
2024 Q4	0	0
2023 Q3	0	0
2023 Q2	0	2
2023 Q1	48	0	0.0
2022 Q4	635	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

3 on file

2017 · 1 incident

October 24, 2017 IA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS

River City Stone Division Of Mathy Construction Co · Over-exertion in pulling or pushing objects

Operator injured lower back while pulling core from drill casing.

2006 · 1 incident

July 3, 2006 IA · Metal/Non-Metal laborer, blacksmith, bull gang, parts runner, roustabout, pick-up man, pitman HANDLING OF MATERIALS

River City Stone Division Of Mathy Construction Co · Caught in, under or between (Not Elsewhere Classified)

While putting V-belt on screen pulley, pulley came back and pinched employees finger resulting in a laceration.

2001 · 1 incident

October 22, 2001 IA · Metal/Non-Metal mine manager, mine foreman, mine owner HANDLING OF MATERIALS

River City Stone Division Of Mathy Construction Co · Struck by... (Not Elsewhere Classified)

THERE WAS A HOLE IN THE HOSE AT THE SLURRY PUMP THAT NEEDED REPAIR. THE DAMAGED SECTION WAS CUT OFF. THERE WERE THREE PROTRUDING WIRES STICKING OUT FROM THE END ABOUT 1/4". THE RUBBER PIPE IS REINFORCED WITH THE WIRE. THE HOSE BEGAN TO SLIP FROM THE EMBANKMENT, THE MINER TRIED TO GRAB IT WHICH RESULTED IN A PUNCTURE IN HIS PALM BY THE WIRE.