Mining Incidents

N R Hamm Quarry LLC operator

Controlled by Summit Materials LLC
MSHA operator ID: L00313
Fatalities
1
Total incidents
100
Mines on record
19
Years on record
1984–2026
Compliance record
MSHA citations since 2000
829
citations
173
significant & substantial
$335,854
proposed penalties
$267,853
paid to date
80% of proposed penalties paid to date, a $68,001 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2000
510
inspections on record
6,504
inspection hours
12.7
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.
829 citations across 6,504 inspection hours.
Source: MSHA inspections data, updated weekly.
Penalty disposition
Differences between proposed and paid penalties reflect both settlements and conference reductions and amounts still owed. Outstanding is the balance currently owed.
$336K
proposed penalties
$271K
current assessed
$268K
paid to date
$3K
outstanding
819 assessments are final orders; 10 contested dockets.
As of the most recent assessment on 2026-03-02.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.

Top causes

Incident timeline

2026
2
2025
5
2024
4
2023
1
2022
3
2021
7
2020
1
2019
5
2017
1
2015
1
2014
1
2010
1 (1f)
2008
2
2007
1
2005
1
2003
2
2002
1
2001
1
2000
2
1999
3
1998
2
1997
2
1996
5
1995
2
1994
6
1993
5
1992
12
1991
5
1990
9
1989
4
1988
1
1984
2

Mines on record

Fatalities under this operator

1 recorded
October 16, 2010 KS · Metal/Non-Metal haul/off road/coal/ore/pit/quarry/rock/rubber tire truck driver, transportation truck driver Fatality · POWERED HAULAGE
N R Hamm Quarry LLC · Caught in, under or between two or more moving objects

Adjusting and cleaning of a tail pulley on a 110' Masaba Conveyor LOTO was not performed by the EE before entering the tail pulley section of the conveyor. Belt was energized by the operator; EE was in tangled in the pulley from his feet to his mid section of his body. EE was fatally injured.

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The full compliance file on N R Hamm Quarry LLC

A dated report covering the 26-year penalty trail, line-item violation pattern, contest and docket posture, rate-normalized peer benchmark, and full fatality history. Delivered as a PDF with the underlying data as CSV.