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
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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.