ALL STATUSES / OPERATOR PORTFOLIO

Northstar Materials Inc dba Knife River Materials

Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.

MSHA OPERATOR ID0051129

MINE PORTFOLIO

22 of 22 mines and facilities

2025-01-01 – 2026-10-17. All statuses records; production reporting is not required.

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Crusher #433162103870 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——001.0
Crusher #435162103096 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——002.5
Crusher #435172103185 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——101.0
Crusher #435192102718 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——001.5
Crusher #435212103572 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——609.5
Crusher #435232103248 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——001.8
Crusher #435272102702 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——002.5
Crusher #435342103127 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——005.5
Screen #445352103502 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——204.5
Screen Plant 445402103419 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——107.0
Wash Plant 454752103417 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——209.0
Wash Screw #457082103642 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——103.8
Wash Screw #457192103626 · IntermittentBeltrami, MNSurface · MSHA: Construction Sand and Gravel——109.8
435262103110 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
Crusher #435192102908 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
Crusher #435242102773 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
Crusher #435262103871 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
Portable Wash Plant2102791 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
Reclaim2103783 · AbandonedLake Of The Woods, MNSurface · MSHA: Crushed, Broken Granite——00—
Wash Plant 457092100449 · AbandonedClearwater, MNSurface · MSHA: Construction Sand and Gravel——00—
Wash Plant 457202103358 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——00—
WASH SCREW #457232103627 · AbandonedBeltrami, MNSurface · MSHA: Construction Sand and Gravel——001.8

LOCATION

Portfolio map

16 of 22 mines with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-17Applies to production, safety and portfolio metrics. Silica samples have separate filters.

Violations

14

1 significant & substantial (S&S)

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q31
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q313
  8. 2026 Q4 *0

Accident records

0

0 records classified as fatality

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q30
  8. 2026 Q4 *0

Proposed penalties · USD

906.00

6 of 14 violations with amounts

  1. 2025 Q1—
  2. 2025 Q2—
  3. 2025 Q3151
  4. 2025 Q4—
  5. 2026 Q1—
  6. 2026 Q2—
  7. 2026 Q3755
  8. 2026 Q4 *—

On-site inspection hours

61.00

24 inspections · 24 with hours

  1. 2025 Q1—
  2. 2025 Q28.75
  3. 2025 Q313.50
  4. 2025 Q4—
  5. 2026 Q1—
  6. 2026 Q28.50
  7. 2026 Q330.25
  8. 2026 Q4 *—
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q100—000—
2025-Q200—0028.8
2025-Q310151.0000513.5
2025-Q400—000—
2026-Q100—000—
2026-Q200—0048.5
2026-Q3131755.00001330.3
2026-Q4 *00—000—

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Safety activity

  1. inspectionF057391
    Crusher #43521 · 2103572

    Compliance Follow-up Inspection · 1.5 on-site hours

  2. inspectionF052EDD
    Crusher #43521 · 2103572

    Regular Safety and Health Inspection · 7.5 on-site hours

  3. violation5113002
    Screen #44535 · 2103502

    56.12028

  4. violation5113001
    Screen #44535 · 2103502

    56.18002(b)

  5. violation5113008
    Crusher #43521 · 2103572

    56.12028 · S&S

  6. violation5113007
    Crusher #43521 · 2103572

    56.12018

  7. violation5113006
    Crusher #43521 · 2103572

    56.12002

  8. violation5113005
    Crusher #43521 · 2103572

    56.14132(a)

  9. violation5113004
    Crusher #43521 · 2103572

    56.4230(a)(1)

  10. violation5113003
    Crusher #43521 · 2103572

    56.12004

  11. inspectionF052EDC
    Screen #44535 · 2103502

    Regular Safety and Health Inspection · 4.5 on-site hours

  12. inspectionF0471B8
    Wash Screw #45708 · 2103642

    Mine Idle Activity · 2.0 on-site hours

  13. inspectionF0471B9
    Crusher #43316 · 2103870

    Mine Idle Activity · 1.0 on-site hours

  14. violation5117879
    Wash Screw #45708 · 2103642

    56.1000 · $151.00 proposed

  15. inspectionF052ED5
    Wash Screw #45719 · 2103626

    Regular Safety and Health Inspection · 1.3 on-site hours

  16. inspectionF052ED6
    WASH SCREW #45723 · 2103627

    Mine Idle Activity · 0.0 on-site hours

  17. inspectionF03ED92
    Screen Plant 44540 · 2103419

    Regular Safety and Health Inspection · 2.0 on-site hours

  18. violation5115787
    Screen Plant 44540 · 2103419

    56.12004 · $151.00 proposed

  19. inspectionF03ED8D
    Crusher #43519 · 2102718

    Regular Safety and Health Inspection · 1.5 on-site hours

  20. inspectionF03ED8E
    Crusher #43517 · 2103185

    Regular Safety and Health Inspection · 1.0 on-site hours

  21. inspectionF03ED8F
    Wash Screw #45719 · 2103626

    Regular Safety and Health Inspection · 1.0 on-site hours

  22. violation5115784
    Crusher #43517 · 2103185

    56.12030 · $151.00 proposed

  23. inspectionF010791
    Wash Screw #45719 · 2103626

    Spot Inspection · 1.5 on-site hours

  24. violation9272748
    Wash Screw #45719 · 2103626

    56.1000 · $151.00 proposed

  25. inspectionF035B4D
    Wash Plant 45475 · 2103417

    Regular Safety and Health Inspection · 5.5 on-site hours

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-17.

Counts describe published rows, including contractor records; accident records are not distinct incidents or numbers of people injured.

Zero means no matching records in the imported sources, not proof of no events. Historical coverage differs by source; absence before a source begins reporting is not a zero incident rate. Invalid or absent dates and records after the snapshot are excluded.

S&S means SIG_SUB=Y. Fatality records use DEGREE_INJURY_CD=01. Proposed penalties are not final assessed or paid amounts; missing dollar values are omitted.

Inspection hours are SUM_TOTAL_ON_SITE_HOURS attributed to the inspection start date, without supervisor/trainee hours. Missing hours are omitted; a started inspection may still be open.

Portfolio totals use current mine membership, including events before the current owner or operator's tenure.

CFR headings link to the current Title 30 index; they are not historical legal determinations.

SELECTED PORTFOLIO

1 linked controller.

Relationships reflect the selected mine status and current MSHA controller/operator fields.