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Mammoth Coal safety activity

MSHA violations, accident reports and inspections across the current mine portfolio.

2025-01-01 – 2026-10-31Database snapshot · 2026-10-31

Safety activity

  1. Approval of other fire suppression devices.

    violationRecord 5133267
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1107-13(g) · $151.00 proposed penalty

  2. Mechanical equipment guards.

    violationRecord 5133266
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1722(a) · Significant and substantial (S&S) · $2,712.00 proposed penalty

  3. Accumulation of combustible materials.

    violationRecord 5133265
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.400 · $755.00 proposed penalty

  4. Installation of electric equipment and conductors; permissibility.

    violationRecord 5133264
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1002(a) · $336.00 proposed penalty

  5. Accumulation of combustible materials.

    violationRecord 5133263
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.400 · $336.00 proposed penalty

  6. Spot Inspections

    inspectionRecord F005E85
    ROAD FORK #52 MINE · 4609522

    103(i) · 6.0 on-site hours reported

  7. Verbal Hazard Complaint Inspections

    inspectionRecord F010DF4
    ROAD FORK #52 MINE · 4609522

    12.0 on-site hours reported

  8. Protection from falls of roof, face and ribs.

    violationRecord 5096634
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.202(a) · Significant and substantial (S&S) · $3,448.00 proposed penalty

  9. Permissible electric face equipment; maintenance.

    violationRecord 5096633
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.503 · $549.00 proposed penalty

  10. Mine ventilation plan; submission and approval.

    violationRecord 5096632
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.370(a)(1) · $1,219.00 proposed penalty

  11. Maintenance of belt conveyors and belt conveyor entries.

    violationRecord 5133262
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1731(a) · $336.00 proposed penalty

  12. Identification check system.

    violationRecord 5133261
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1715 · $151.00 proposed penalty

  13. Other safeguards.

    violationRecord 5095552
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1403

  14. Other safeguards.

    violationRecord 5095551
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.1403

  15. Powered haulage

    accidentRecord 220261560005
    ROAD FORK #52 MINE · 4609522

    Days away from work only

    Accident narrative

    While on a rail mantrip, following a supply motor going out-by on 1A track, the motor went through a dip on the track and slid backwards striking the rail mantrip.

  16. Powered haulage

    accidentRecord 220261590025
    ROAD FORK #52 MINE · 4609522

    No dys awy frm wrk,no rstr act

    Accident narrative

    While riding on a rail mantrip following a supply motor going out-by on 1A track. The motor went through a dip on the track and slid backwards striking the rail mantrip.

  17. Powered haulage

    accidentRecord 220261590023
    ROAD FORK #52 MINE · 4609522

    Days away from work only

    Accident narrative

    While driving a rail mantrip, following a supply motor going out-by on 1A track. The motor went through a dip on the track and slid backwards striking the rail mantrip.

  18. Verbal Hazard Complaint Inspections

    inspectionRecord F010DF3
    ROAD FORK #52 MINE · 4609522

    29.0 on-site hours reported

  19. Spot Inspections

    inspectionRecord F005E84
    ROAD FORK #52 MINE · 4609522

    103(i) · 6.0 on-site hours reported

  20. Power wires and cables; insulation and protection.

    violationRecord 5096630
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.517 · Significant and substantial (S&S) · $9,004.00 proposed penalty

  21. Mine ventilation plan; submission and approval.

    violationRecord 5096628
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.370(a)(1) · $549.00 proposed penalty

  22. Methane monitors.

    violationRecord 5095554
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.342(a)(4) · $336.00 proposed penalty

  23. Methane monitors.

    violationRecord 5095553
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.342(a)(4) · $313.00 proposed penalty

  24. Power wires and cables; insulation and protection.

    violationRecord 5094783
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.517 · Significant and substantial (S&S) · $4,047.00 proposed penalty

  25. Power wires and cables; insulation and protection.

    violationRecord 5094782
    ROAD FORK #52 MINE · 4609522

    30 CFR 75.517 · Significant and substantial (S&S) · $4,047.00 proposed penalty

Sources and definitions

MSHA Violations (issue date), Accidents (accident date) and Inspections (begin date).

Violation titles use current CFR headings to identify the cited rule; they are not the inspector’s account of what happened.

Status is from the current MSHA Mines snapshot, not the selected reporting period. Closed records can retain their last reported controller/operator.

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.