Search

MSHA DATABASEMSHA records · 16 contributing sources · snapshot Oct 18, 2026
USX Corp (United States Steel Corp)→United States Steel Corp-Minnesota Ore Operations→Minntac Mine

MINE DETAILS

Minntac Mine

ActiveSurfaceIron Ore
MSHA MINE ID2100282
LOCATIONSt Louis, MN
PUBLIC RECORD16,682 linked rows

LOCATION

Mine location

1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-18Applies to production, safety and portfolio metrics. Silica samples have separate filters.

2025 Q1 – 2026 Q4

JSONCSV

Database snapshot · 2026-10-18. MSHA quarterly production and employment reports.

Coal production

0

reported short tons

  1. 2025 Q10
  2. 2025 Q20
  3. 2025 Q30
  4. 2025 Q40
  5. 2026 Q10
  6. 2026 Q20
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Hours worked

3,261,623

reported employee hours

  1. 2025 Q1534,513
  2. 2025 Q2557,637
  3. 2025 Q3527,845
  4. 2025 Q4579,585
  5. 2026 Q1542,865
  6. 2026 Q2519,178
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Tons per hour

0.00

production ÷ hours worked

  1. 2025 Q10.00
  2. 2025 Q20.00
  3. 2025 Q30.00
  4. 2025 Q40.00
  5. 2026 Q10.00
  6. 2026 Q20.00
  7. 2026 Q3—No usable value reported
  8. 2026 Q4 *—No usable value reported

Missing values appear as —. Totals use available reports. Tons per hour requires production and hours for the same quarters and a nonzero hours total. * Striped bars mark partial mine coverage or an incomplete quarter. See the table for coverage.

Quarterly data and reporting coverage
Quarterly production, employment and reporting coverage for Minntac Mine
QuarterCoal (short tons)Hours workedTons / hourAvg. employeesCoverage
2025 Q10534,5130.001,0251/1 mines reporting
2025 Q20557,6370.001,0691/1 mines reporting
2025 Q30527,8450.001,0121/1 mines reporting
2025 Q40579,5850.001,1111/1 mines reporting
2026 Q10542,8650.001,0411/1 mines reporting
2026 Q20519,1780.009961/1 mines reporting
2026 Q3————No report
2026 Q4————No report

Safety and enforcement

2025-01-01 – 2026-10-18

Violations

305

41 significant & substantial (S&S)

  1. 2025 Q185
  2. 2025 Q227
  3. 2025 Q34
  4. 2025 Q49
  5. 2026 Q1136
  6. 2026 Q244
  7. 2026 Q30
  8. 2026 Q4 *0

Accident records

29

0 records classified as fatality

  1. 2025 Q17
  2. 2025 Q24
  3. 2025 Q33
  4. 2025 Q46
  5. 2026 Q14
  6. 2026 Q21
  7. 2026 Q34
  8. 2026 Q4 *0

Proposed penalties · USD

536,022.00

304 of 305 violations with amounts

  1. 2025 Q1120,315
  2. 2025 Q253,011
  3. 2025 Q32,820
  4. 2025 Q427,960
  5. 2026 Q1269,396
  6. 2026 Q262,520
  7. 2026 Q3—
  8. 2026 Q4 *—

On-site inspection hours

665.25

28 inspections · 28 with hours

  1. 2025 Q1185.00
  2. 2025 Q223.25
  3. 2025 Q313.00
  4. 2025 Q4235.00
  5. 2026 Q1196.25
  6. 2026 Q25.75
  7. 2026 Q37.00
  8. 2026 Q4 *—

Counts are published records, including contractor records. * The quarter was incomplete at the snapshot date; recent counts may rise as reports arrive. — means no reported amount or hours. Portfolio totals use current membership.

Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q1858120,315.00705185.0
2025-Q227453,011.0040623.3
2025-Q3402,820.0030613.0
2025-Q49127,960.00601235.0
2026-Q113622269,396.00405196.3
2026-Q244662,520.001035.8
2026-Q300—4027.0
2026-Q4 *00—000—

Most cited CFR sections

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

SectionViolationsS&S
30 CFR 56.20003Housekeeping.9121
30 CFR 56.12004Electrical conductors.202
30 CFR 56.14207Parking procedures for unattended equipment.170
30 CFR 56.16006Protection of gas cylinder valves.150
30 CFR 56.12028Testing grounding systems.140
30 CFR 56.12030Correction of dangerous conditions.131
30 CFR 56.11002Handrails and toeboards.112
30 CFR 56.11012Protection for openings around travelways.101
30 CFR 56.14112Construction and maintenance of guards.100
30 CFR 56.14107Moving machine parts.91

Safety activity

  1. violation5115715

    56.20003(b) · $1,037.00 proposed

  2. violation5115714

    56.12004 · $959.00 proposed

  3. violation5115713

    56.20003(b) · $1,037.00 proposed

  4. violation5115712

    56.14207 · $818.00 proposed

  5. violation5115711

    56.17001 · $288.00 proposed

  6. violation5115710

    56.12030 · $2,133.00 proposed

  7. violation5115709

    56.16006 · $549.00 proposed

  8. violation5115708

    56.12004 · $959.00 proposed

  9. violation5115707

    56.12008 · $959.00 proposed

  10. violation5115706

    56.12008 · $959.00 proposed

  11. violation5115705

    56.12004 · S&S · $4,749.00 proposed

  12. violation5115704

    56.20003(a) · $959.00 proposed

  13. violation5115703

    56.16006 · $549.00 proposed

  14. violation5115702

    56.12004 · $959.00 proposed

  15. violation5115701

    56.12008 · $959.00 proposed

  16. violation5115700

    56.20003(a) · S&S · $10,569.00 proposed

  17. violation5115698

    56.12004 · $755.00 proposed

  18. violation5115697

    56.16006 · $366.00 proposed

  19. violation5115696

    56.12008 · $755.00 proposed

  20. violation5115695

    56.4104(a) · $504.00 proposed

  21. violation5115694

    56.11016 · S&S · $2,133.00 proposed

  22. violation5115693

    56.20003(a) · $697.00 proposed

  23. violation5115692

    56.20003(b) · S&S · $3,736.00 proposed

  24. violation5115691

    56.12030 · $1,550.00 proposed

  25. violation5115690

    56.20003(b) · $755.00 proposed

Safety sources and definitions

MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-18.

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.

OWNERSHIP

Operator and controller history

Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.

CURRENT HIERARCHYUSX Corp (United States Steel Corp) → United States Steel Corp-Minnesota Ore Operations → Minntac Mine
HISTORY RECORDS13 relationships
INTERVAL CHECKPASScontroller/operator overlap
—

USX Corp (United States Steel Corp)controlsUnited States Steel Corp-Minnesota Ore OperationsoperatesMinntac Mine

msha-controller-operator-history · controller/operator co-tenure derived on mine 2100282
Other historical summaries · source-specific periods

RECORD SUMMARY

Production, safety and enforcement

These summaries use the periods stated on each card, independently of the reporting period above.

01 / SAFETYwatch

Accidents and injuries

339 historical accident/injury rows; 0 coded fatalities and 4,317 lost days across the published record.

ACCIDENT + INJURY RECORD100 since 2021
accidentsmine-production-quarterly
02 / COMPLIANCEwatch

Violations and penalties

4,346 violation rows across the full record; 841 carry an S&S flag and $4,616,719 appears in current assessed amounts.

ENFORCEMENT ACTIVITY1,270 since 2021
inspectionsviolationsassessed-violationsorders-107a
03 / HEALTHwatch

Occupational health samples

320 personal; 113 area. 32 personal-sample rows have a published C/E ratio above 1; 0 noise rows have an action-level or PEL dose above 100%. These are separate measures, not a silica exceedance count. Silica results and sample status are shown separately.

OCCUPATIONAL EXPOSURE433 samples
personal-health-samplesarea-samples
04 / PRODUCTIONcontext

Quarterly production and employment

519K employee hours and 996 summed average employees across reported subunits in the latest published quarter.

2026-Q20 tons
mine-production-quarterlymine-production-yearly
05 / LEGALwatch

Contests, conferences and decisions

1,137 contested-violation rows, 1,138 civil-penalty docket/decision rows, and 54 conference records linked by issuance number.

POST-ISSUANCE LIFECYCLE2,329 linked rows
conferencescontested-violationscivil-penalty-dockets-decisions
06 / CONTRACTORScontext

Contractors

Contractors are linked through this mine’s violation or accident records. Their production and hours cover all their operations, so they are not included in this mine’s totals.

ENTITY-LEVEL CONTEXT29 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations
07 / INSPECTIONScontext

Inspections

250 inspection events and 22K published inspection hours across the historical record.

OVERSIGHT COVERAGE80 since 2021
inspectionsviolations

HEALTH SAMPLING

Silica and quartz

Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 2026. 135 silica records across the mine’s published history.

Matching records10 coal · 1 personal · 0 area
Sample status0 not voided0 voided · 1 status not reported
Personal samples with C/E > 101 published ratios · not a citation count

Personal silica samples · concentration / limit

Quarterly mean · published C/E ratio

  1. 2026-Q10.981 measurements
  2. 2026-Q2—0 measurements
  3. 2026-Q3—0 measurements
  4. 2026-Q4*—0 measurements

— No eligible measurements. * Quarter in progress. Means describe the available samples, not average exposure across the mine.

Quartz % is the sample’s quartz content; µg/m³ is its reported concentration. Personal C/E is the ratio to the limit published with that sample. Personal and area concentration units and void status are not specified in those source files.

2026 · Feb 26, 2026–Feb 26, 2026
Date / sampleDataset / analyteOccupation / areaMeasurementSample statusPublished action
000000202600764300Metal/nonmetal personalQuartz, respirable, >1% QtzShovel Operator0.98× published limitConcentration: 0000.40 · limit: 0000.41Source unit unspecifiedNot reportedNO ACTIONInspection F034916
Sources and interpretation
  • Coal means use numeric concentrations from samples marked not voided, excluding control/invalid sample types and dates after the snapshot. Missing values remain null; reported zeroes remain zero.
  • Quarterly means describe available samples, not mine-wide or worker-average exposure. Quarters with no eligible measurements remain empty; the current quarter is partial.
  • Personal C/E is MSHA's published concentration-to-limit ratio. A value above 1 is not by itself a citation or a determination under the 2024 silica rule. Personal and area files do not publish a void-status field.
  • Area records include bulk-dust analyses and are kept separate from personal exposure results. Their concentration units are not specified in the source dictionary.
  • Missing samples do not establish safe conditions. Coal quartz percentage and concentration are separate measures. No compliance threshold is inferred for coal samples.

Coal quartz field definitions ↗Metal/nonmetal personal field definitions ↗Metal/nonmetal area field definitions ↗

EIA + TITLE 30

EIA production and cited regulations

EIA annual figures are reported separately from MSHA. Regulation links use the current eCFR snapshot.

EIA MINE CONTEXTNo matched record
Not present in the 2024 EIA coal workbook.

This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.

TITLE 30 CROSSWALKCurrent through 2026-08-19
30 CFR 56.12032Inspection and cover plates.3 recent rows ↗30 CFR 56.11012Protection for openings around travelways.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 56.20003Housekeeping.2 recent rows ↗30 CFR 56.12004Electrical conductors.3 recent rows ↗30 CFR 56.14107Moving machine parts.1 recent row ↗30 CFR 56.11003Construction and maintenance of ladders.1 recent row ↗

RECENT PUBLIC RECORDS

Recent violations and samples

Latest records retained for inspection; aggregates above use the full source history.

VIOLATIONS12 latest shown
511573056.12032Citation
511572956.12032Citation
511572856.11012Citation
511572756.14100(b)Citation
511572656.20003(a)Citation
511572556.12004Citation
511572456.12004Citation
511572356.14107(a)Citation
OTHER HEALTH SAMPLES7 latest shown

Coal dust, noise and other contaminants. Silica records above ↑

Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgDrill Operator, Rotary
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgLaborer, Bullgang
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgOverhead Crane Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified

SOURCE COVERAGE

Reporting dates and coverage

16 datasets contain linked records. Missing datasets are listed below.

DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors339Jan 7, 2000—Sep 22, 2026mine-keyed
Addresses of Recordidentity · logistics1Oct 1, 1987—Oct 1, 1987mine-keyed
Assessed Violationscompliance · legal4,322Aug 3, 2000—May 18, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal1,138Apr 10, 2007—Sep 30, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal54Feb 5, 2001—Apr 29, 2025mine-keyed
Contested Violationscompliance · legal1,137Feb 17, 2006—Apr 28, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety3,585Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety809Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance1Jan 1, 1950—Jan 1, 1950mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance212Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance54Not published—Not publishedmine-keyed
Inspectionssafety · compliance250Mar 22, 2000—Aug 18, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety113Jul 10, 2008—Mar 12, 2026mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety320Feb 26, 2002—Feb 26, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal4,346Aug 3, 2000—May 18, 2026mine-keyed
107(a) Orders Issuedsafety · compliance—No published rowsabsent / not applicable

NOTES

Limitations

  • Contractor production is entity-level and is never represented as mine-attributable.
  • Missing rows can mean no event, publication delay, identity mismatch, or inapplicability.