MINE DETAILS
Minntac Mine
MSHA MINE ID2100282
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Minntac Mine47.53250, -92.62361Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-13. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
3,261,623reported employee hours
Tons per hour
0.00production ÷ hours worked
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
| Quarter | Coal (short tons) | Hours worked | Tons / hour | Avg. employees | Coverage |
|---|---|---|---|---|---|
| 2025 Q1 | 0 | 534,513 | 0.00 | 1,025 | 1/1 mines reporting |
| 2025 Q2 | 0 | 557,637 | 0.00 | 1,069 | 1/1 mines reporting |
| 2025 Q3 | 0 | 527,845 | 0.00 | 1,012 | 1/1 mines reporting |
| 2025 Q4 | 0 | 579,585 | 0.00 | 1,111 | 1/1 mines reporting |
| 2026 Q1 | 0 | 542,865 | 0.00 | 1,041 | 1/1 mines reporting |
| 2026 Q2 | 0 | 519,178 | 0.00 | 996 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
30541 significant & substantial (S&S)
Accident records
290 records classified as fatality
Proposed penalties · USD
536,022.00304 of 305 violations with amounts
On-site inspection hours
665.2528 inspections · 28 with hours
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
| Quarter | Violations | S&S | Proposed USD | Accident records | Fatality records | Inspections | On-site hours |
|---|---|---|---|---|---|---|---|
| 2025-Q1 | 85 | 8 | 120,315.00 | 7 | 0 | 5 | 185.0 |
| 2025-Q2 | 27 | 4 | 53,011.00 | 4 | 0 | 6 | 23.3 |
| 2025-Q3 | 4 | 0 | 2,820.00 | 3 | 0 | 6 | 13.0 |
| 2025-Q4 | 9 | 1 | 27,960.00 | 6 | 0 | 1 | 235.0 |
| 2026-Q1 | 136 | 22 | 269,396.00 | 4 | 0 | 5 | 196.3 |
| 2026-Q2 | 44 | 6 | 62,520.00 | 1 | 0 | 3 | 5.8 |
| 2026-Q3 | 0 | 0 | — | 4 | 0 | 2 | 7.0 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
While crossing the pipelines, the employee tripped over a pump cable running from the substation to the switchgear. Due to the operational setup and required location of the cable, it could not be permanently secured or removed from the area. The employee rolled their right ankle, heard a popping sound, experienced pain running up the leg, and fell to the ground.
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While removing a 2.5-inch flange-connected valve, residual water in the line discharged under unexpected pressure after bolts were loosened. Employee descended scaffold while being sprayed with water. Upon reaching the ground, employee slipped on the wet surface and fell onto the concrete floor, impacting the left shoulder which resulted in a dislocation and fracture.
HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
A pin was being inserted into a crusher ram. One employee tapped the pin with a hammer while the hybrid (injured) held the ram in place. After two taps, the ram had slipped, pinching the hybrid's right pinky finger between the ram and pedestal causing a laceration requiring sutures to close.
Verbal Hazard Complaint Inspections · 3.8 on-site hours
MACHINERY · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Employee was cutting the horizontal flange of an 8" I-beam off to make a T-beam. After making the final cut on the beam, a piece 8" wide x 12' approximately 250lbs. fell striking the employees left foot.
Verbal Hazard Complaint Inspections · 3.3 on-site hours
56.12032 · $2,133.00 proposed
56.12032 · $2,133.00 proposed
56.11012 · $1,320.00 proposed
56.14100(b) · $959.00 proposed
56.20003(a) · $959.00 proposed
56.12004 · $398.00 proposed
56.12004 · $959.00 proposed
56.14107(a) · $432.00 proposed
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While discarding obsolete hydraulic pipe into metal skip, set one end down to grab other end of hydraulic pipe with both hands and caught right hand pinky finger between pipe and edge of skip.
56.12004 · $959.00 proposed
56.11003 · $288.00 proposed
56.20003(b) · $2,312.00 proposed
56.12032 · $1,679.00 proposed
Verbal Hazard Complaint Inspections · 2.3 on-site hours
Impoundment Spot Inspection · 1.8 on-site hours
Verbal Hazard Complaint Inspections · 1.8 on-site hours
56.12005 · $959.00 proposed
56.12004 · $959.00 proposed
56.12004 · $959.00 proposed
Safety sources and definitions
MSHA Violations (issue date), Accidents (accident date), and Inspections (begin date). Snapshot 2026-10-13.
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.
—
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 2100282Other 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-quarterly02 / 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-107a03 / 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-samples04 / 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-yearly05 / 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-decisions06 / 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-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
250 inspection events and 22K published inspection hours across the historical record.
OVERSIGHT COVERAGE80 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 135 silica records across the mine’s published history.
Personal silica samples · concentration / limit
Quarterly mean · published C/E ratio
— 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.
| Date / sample | Dataset / analyte | Occupation / area | Measurement | Sample status | Published action |
|---|---|---|---|---|---|
| 000000202600764300 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Shovel Operator | 0.98× published limitConcentration: 0000.40 · limit: 0000.41Source unit unspecified | Not reported | NO 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.
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.
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.
511573056.12032Citation
511572956.12032Citation
511572856.11012Citation
511572756.14100(b)Citation
511572656.20003(a)Citation
511572556.12004Citation
511572456.12004Citation
511572356.14107(a)Citation
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.