MINE DETAILS
Tilden Mine
MSHA MINE ID2000422
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Tilden Mine46.38944, -87.63611Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-17. MSHA quarterly production and employment reports.
Coal production
—reported short tons
Hours worked
—reported employee hours
Tons per hour
—production ÷ 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 | — | — | — | — | No report |
| 2025 Q2 | — | — | — | — | No report |
| 2025 Q3 | — | — | — | — | No report |
| 2025 Q4 | — | — | — | — | No report |
| 2026 Q1 | — | — | — | — | No report |
| 2026 Q2 | — | — | — | — | No report |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-17
Violations
48463 significant & substantial (S&S)
Accident records
360 records classified as fatality
Proposed penalties · USD
706,946.00483 of 484 violations with amounts
On-site inspection hours
1,312.0032 inspections · 32 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 | 76 | 7 | 97,678.00 | 8 | 0 | 3 | 289.5 |
| 2025-Q2 | 76 | 4 | 176,740.00 | 3 | 0 | 3 | 17.3 |
| 2025-Q3 | 10 | 1 | 19,972.00 | 5 | 0 | 5 | 19.8 |
| 2025-Q4 | 55 | 10 | 105,938.00 | 6 | 0 | 5 | 470.0 |
| 2026-Q1 | 112 | 13 | 129,807.00 | 4 | 0 | 8 | 61.8 |
| 2026-Q2 | 155 | 28 | 176,811.00 | 5 | 0 | 4 | 439.3 |
| 2026-Q3 | 0 | 0 | — | 5 | 0 | 3 | 14.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 1 | 0.0 |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
56.14112(b) · $549.00 proposed
56.14112(b) · $1,219.00 proposed
56.4101 · $151.00 proposed
56.9300(a) · S&S · $151.00 proposed
56.12032 · $226.00 proposed
56.14112(b) · S&S · $2,712.00 proposed
56.14110 · $177.00 proposed
Impoundment Spot Inspection · 4.3 on-site hours
56.14112(b) · $549.00 proposed
56.20003(a) · $592.00 proposed
56.14112(b) · $549.00 proposed
56.20003(a) · $592.00 proposed
56.20003(a) · $592.00 proposed
56.14112(b) · $549.00 proposed
56.20003(a) · S&S · $2,936.00 proposed
56.14105 · S&S · $2,936.00 proposed
56.20003(a) · $1,320.00 proposed
56.20003(a) · S&S · $2,936.00 proposed
56.4201(a)(2) · $288.00 proposed
56.12004 · $313.00 proposed
56.14101(a)(2) · $151.00 proposed
56.4601 · $366.00 proposed
56.14112(b) · $697.00 proposed
56.14112(b) · $697.00 proposed
56.14107(a) · $592.00 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.
OWNERSHIP
Operator and controller history
Current ownership comes from MSHA Mines. Historical start and end dates come from MSHA Controller and Operator History.
—
Cleveland-Cliffs InccontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422—
U.S. Steel Canada et alcontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422—
Cliffs Natural Resources Inc et alcontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422—
Cleveland-Cliffs InccontrolsCleveland-Cliffs Iron CompanyoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422Other 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
786 historical accident/injury rows; 1 coded fatalities and 11,010 lost days across the published record.
ACCIDENT + INJURY RECORD105 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
7,465 violation rows across the full record; 1,106 carry an S&S flag and $7,477,095 appears in current assessed amounts.
ENFORCEMENT ACTIVITY2,013 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
530 personal; 41 area. 25 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 EXPOSURE571 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
363K employee hours and 800 summed average employees across reported subunits in the latest published quarter.
2002-Q40 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
2,072 contested-violation rows, 2,085 civil-penalty docket/decision rows, and 107 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE4,264 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 CONTEXT77 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
361 inspection events and 37K published inspection hours across the historical record.
OVERSIGHT COVERAGE86 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 17, 2026. 126 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 |
|---|---|---|---|---|---|
| 000000202602279100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Welder, etc. | 0.62× published limitConcentration: 0000.65 · limit: 0001.05Source unit unspecified | Not reported | NO ACTIONInspection F016F6F |
| 000000202602279200 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Building Repair/Maint. | 0.24× published limitConcentration: 0000.15 · limit: 0000.63Source unit unspecified | Not reported | NO ACTIONInspection F016F6F |
| 000000202602279400 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Supervisor, Co. Official | 0.18× published limitConcentration: 0000.14 · limit: 0000.79Source unit unspecified | Not reported | NO ACTIONInspection F016F6F |
| 000000202602279500 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Building Repair/Maint. | 0.31× published limitConcentration: 0000.23 · limit: 0000.75Source unit unspecified | Not reported | NO ACTIONInspection F016F6F |
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 56.4101Warning signs.3 recent rows ↗30 CFR 56.20003Housekeeping.1 recent row ↗30 CFR 56.11003Construction and maintenance of ladders.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 56.14101Brakes.1 recent row ↗30 CFR 56.15004Eye protection.1 recent row ↗30 CFR 56.9300Berms or guardrails.1 recent row ↗30 CFR 56.14107Moving machine parts.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
511759656.4101Citation
511759556.20003(a)S&S
511713956.11003Citation
511713856.14100(a)S&S
511713756.14101(a)(2)S&S
511713656.15004S&S
511713556.9300(d)(1)Citation
511646856.4101Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgBuilding Repair/Maint.
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Zinc oxide fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0010.00Source unit unspecified
Vanadium fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0050.00Source unit unspecified
Nickel fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0003.00Source unit unspecified
Molybdenum fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0020.00Source unit unspecified
Manganese fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0005.00Source unit unspecified
Magnesium oxide fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0020.00Source unit unspecified
Lead fumesMechanic
C/E: 00.00Concentration: 0000.00 · limit: 0450.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors786Jan 4, 2000—Aug 28, 2026mine-keyed
Addresses of Recordidentity · logistics1Nov 22, 1978—Nov 22, 1978mine-keyed
Assessed Violationscompliance · legal7,432Mar 21, 2000—May 28, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal2,085Jan 8, 2002—Jun 10, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal107Apr 10, 2000—May 27, 2026mine-keyed
Contested Violationscompliance · legal2,072Mar 2, 2004—May 28, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety8,439Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,685Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Aug 25, 1989mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance36Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance361Mar 21, 2000—Oct 13, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety41May 11, 2006—Jan 19, 2024mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety530Jan 25, 2001—Jun 3, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal7,465Mar 21, 2000—May 28, 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.