Knoxville Mine

Active Underground Stone

Operator: NR Hamm Quarry LLC

Controller: Summit Materials LLC

Location: Knoxville, Marion County, IA

Employees: 21

798
Violations
213
S&S Violations
10
Accidents
$501K
Penalties

Recent Violations

View all 798 →
Date Section S&S Negligence Penalty
12/16/2025 57.14101(a)(2) Non-S&S ModNegligence $151
12/10/2025 57.11053(a) Non-S&S ModNegligence $193
12/10/2025 57.3200 Non-S&S ModNegligence $151
12/10/2025 57.6160(a)(2) Non-S&S LowNegligence $151
12/10/2025 57.3200 S&S ModNegligence $288
12/10/2025 57.4361(a) S&S ModNegligence $959
12/10/2025 57.4363(d) Non-S&S ModNegligence $151
12/10/2025 57.8520 Non-S&S ModNegligence $151
09/08/2025 50.20-1 Non-S&S LowNegligence $151
06/25/2025 Non-S&S $0
05/06/2025 56.14112(a) Non-S&S ModNegligence $151
05/06/2025 57.14207 Non-S&S ModNegligence $151
05/05/2025 57.4102 Non-S&S ModNegligence $151
05/05/2025 56.14112(a) Non-S&S LowNegligence $151
02/11/2025 57.12032 Non-S&S ModNegligence $151
02/11/2025 57.3200 Non-S&S LowNegligence $151
02/11/2025 57.12032 Non-S&S ModNegligence $151
02/11/2025 57.4200(b)(2) S&S LowNegligence $504
02/11/2025 57.4102 S&S ModNegligence $1,126
02/10/2025 57.11058 Non-S&S LowNegligence $151

Accidents & Injuries

View all 10 →
Date Classification Injury Days Lost
06/25/2025 FALL OF ROOF OR BACK ACCIDENT ONLY None
06/25/2025 FALL OF ROOF OR BACK DAYS AWAY FROM WORK ONLY None
06/25/2025 FALL OF ROOF OR BACK DAYS AWAY FROM WORK ONLY None
11/12/2020 FALL OF ROOF OR BACK DYS AWY FRM WRK & RESTRCTD ACT 32d lost, 19d restricted
10/07/2020 POWERED HAULAGE DAYS AWAY FROM WORK ONLY 1d lost
09/15/2020 SLIP OR FALL OF PERSON DAYS AWAY FROM WORK ONLY 28d lost
12/13/2018 MACHINERY DAYS AWAY FROM WORK ONLY 48d lost
02/16/2007 HANDLING OF MATERIALS DYS AWY FRM WRK & RESTRCTD ACT None
05/15/2000 FALL OF ROOF OR BACK ACCIDENT ONLY None
01/07/2000 HANDLING OF MATERIALS DAYS AWAY FROM WORK ONLY 10d lost

Inspections

View all 214 →
Begin End Hours Inspectors
02/23/2026 02/24/2026 9.75 1
12/09/2025 12/17/2025 71.75 2
09/08/2025 09/08/2025 1.25 1
08/25/2025 08/26/2025 8.75 1
06/25/2025 57.25 2
05/05/2025 05/08/2025 40.25 1
03/10/2025 03/12/2025 9.50 1
03/10/2025 03/12/2025 7.25 1
02/24/2025 02/24/2025 4.75 1
02/10/2025 02/13/2025 59.75 2

Mine Details

MSHA Mine ID1302217
Mine TypeUnderground
StatusActive
CommodityStone
SIC DescriptionCrushed, Broken Limestone NEC
Employees21
Days/Week5.0
Hours/Shift4.0
Coordinates41.2700000, -93.1080560
Nearest TownKnoxville

Frequently Asked Questions

How many MSHA violations does Knoxville Mine have?

Knoxville Mine has 798 MSHA violations on record, of which 213 are classified as Significant & Substantial (S&S). Total proposed penalties amount to $501K.

What type of mine is Knoxville Mine?

Knoxville Mine is a Underground mine producing Stone, located in Knoxville, Marion County, IA. It currently has 21 employees.

Has anyone been injured or killed at Knoxville Mine?

According to MSHA records, Knoxville Mine has 10 reported accident/injury records and 0 fatalities on file.

Who operates Knoxville Mine?

Knoxville Mine is operated by NR Hamm Quarry LLC and controlled by Summit Materials LLC. MSHA Mine ID: 1302217.