ACTIVE / OPERATOR PORTFOLIO

O-N Minerals Portage Company LLC

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

MSHA OPERATOR IDL17923

MINE PORTFOLIO

1 of 1 mines and facilities

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

MineLocation / typeCoal · short tonsHours workedViolationsAccident recordsOn-site inspection hours
Portage Operation1202117 · ActivePorter, INFacility · MSHA: Crushed, Broken Limestone NEC——9131.0

LOCATION

Mine location

1 of 1 mine 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

9

4 significant & substantial (S&S)

  1. 2025 Q14
  2. 2025 Q20
  3. 2025 Q31
  4. 2025 Q40
  5. 2026 Q13
  6. 2026 Q21
  7. 2026 Q30
  8. 2026 Q4 *0

Accident records

1

0 records classified as fatality

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q11
  6. 2026 Q20
  7. 2026 Q30
  8. 2026 Q4 *0

Proposed penalties · USD

2,053.00

9 of 9 violations with amounts

  1. 2025 Q11,083
  2. 2025 Q2—
  3. 2025 Q3151
  4. 2025 Q4—
  5. 2026 Q1668
  6. 2026 Q2151
  7. 2026 Q3—
  8. 2026 Q4 *—

On-site inspection hours

31.00

4 inspections · 4 with hours

  1. 2025 Q111.25
  2. 2025 Q2—
  3. 2025 Q34.50
  4. 2025 Q4—
  5. 2026 Q17.75
  6. 2026 Q27.50
  7. 2026 Q3—
  8. 2026 Q4 *—
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q1431,083.0000111.3
2025-Q200—000—
2025-Q310151.000014.5
2025-Q400—000—
2026-Q131668.001017.8
2026-Q210151.000017.5
2026-Q300—000—
2026-Q4 *00—000—

Most cited CFR sections

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

Safety activity

  1. inspectionF0251B3
    Portage Operation · 1202117

    Regular Safety and Health Inspection · 7.5 on-site hours

  2. violation9787893
    Portage Operation · 1202117

    56.14107(a) · $151.00 proposed

  3. accident220261130013
    Portage Operation · 1202117

    SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Employee was descending a 6' ladder. When EE stepped on the ground, EE's knee gave out and EE fell to the ground. Incident occurred on 3/17 but did not become reportable until 4/21 when employee was given a brace and PT was ordered.

  4. inspectionF026575
    Portage Operation · 1202117

    Regular Safety and Health Inspection · 7.8 on-site hours

  5. violation5010438
    Portage Operation · 1202117

    56.12004 · S&S · $366.00 proposed

  6. violation5010437
    Portage Operation · 1202117

    56.12018 · $151.00 proposed

  7. violation5010436
    Portage Operation · 1202117

    56.12030 · $151.00 proposed

  8. inspectionF0160C5
    Portage Operation · 1202117

    Regular Safety and Health Inspection · 4.5 on-site hours

  9. violation9787771
    Portage Operation · 1202117

    56.14100(b) · $151.00 proposed

  10. inspectionF016438
    Portage Operation · 1202117

    Regular Safety and Health Inspection · 11.3 on-site hours

  11. violation9485794
    Portage Operation · 1202117

    56.13021 · S&S · $267.00 proposed

  12. violation9485793
    Portage Operation · 1202117

    56.14107(a) · S&S · $398.00 proposed

  13. violation9485792
    Portage Operation · 1202117

    56.12032 · S&S · $267.00 proposed

  14. violation9485791
    Portage Operation · 1202117

    56.16005 · $151.00 proposed

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.