Northstar Materials Inc dba Knife River Materials operator
Controlled by
Knife River Corporation
MSHA operator ID: 0051129
- Fatalities
- 0
- Total incidents
- 9
- Mines on record
- 7
- Years on record
- 2003–2023
Compliance record
MSHA citations since 2003
335
citations
57
significant & substantial
$59,786
proposed penalties
$50,051
paid to date
84% of proposed penalties paid to date, a $9,735 gap.
Source: MSHA violations data, updated weekly.
Inspection activity
MSHA inspections since 2002
404
inspections on record
3,050
inspection hours
11.0
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.335 citations across 3,050 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.$60K
proposed penalties
$50K
current assessed
$50K
paid to date
$0
outstanding
333 assessments are final orders; 7 contested dockets.
As of the most recent assessment on 2025-07-09.
Source: MSHA assessed-violations and conference/litigation data, updated weekly.
Top causes
- HANDLING OF MATERIALS 3 non-fatal
- HANDTOOLS (NONPOWERED) 1 non-fatal
- MACHINERY 1 non-fatal
- OTHER 1 non-fatal
- POWERED HAULAGE 1 non-fatal
Incident timeline
2023
2
2022
1
2021
1
2019
1
2014
2
2003
2
Mines on record
- Crusher #43519 MN
- Crusher #43517 MN
- Crusher #43534 MN
- Wash Screw #45719 MN
- Wash Plant 45720 MN
- Crusher #43519 MN
- Crusher #43524 MN
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The full compliance file on Northstar Materials Inc dba Knife River Materials
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.