MINE DETAILS
Tilden Mine
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 · 2026-10-18. MSHA quarterly production and employment reports.
Coal production
0reported short tons
Hours worked
2,869,104reported 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 | 478,375 | 0.00 | 801 | 1/1 mines reporting |
| 2025 Q2 | 0 | 479,162 | 0.00 | 790 | 1/1 mines reporting |
| 2025 Q3 | 0 | 460,029 | 0.00 | 776 | 1/1 mines reporting |
| 2025 Q4 | 0 | 470,509 | 0.00 | 789 | 1/1 mines reporting |
| 2026 Q1 | 0 | 500,419 | 0.00 | 860 | 1/1 mines reporting |
| 2026 Q2 | 0 | 480,610 | 0.00 | 884 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-18
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
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While moving a troughing roller frame assembly on 10 Conveyor, Line 3 in the Tilden plant, an employee pinched left thumb resulting in a laceration requiring 2 sutures.
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee reported pain in their left shoulder while moving a case of boosters from a service truck to a cart. Employee was later prescribed restrictions 4-17-2025.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
On 4/5/2025, an incident was reported where an employee took off their hard hat to brush away dust, subsequently getting material in their left eye. The employee had reported the incident their following shift.
HANDTOOLS (NONPOWERED) · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While installing the #8 Support shaft, the safety holdback rigging was in place and not utilized. This allowed the support shaft to slip and pinch the employee's calf between the shaft and shaft support wheels. Communication between the crew and foreman was poor. Crew complacency decreased awareness
SLIP OR FALL OF PERSON · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
An employee was ascending a stairwell prior to the start of their shift when the employee experienced a personal medical issue. The employee subsequently tripped and experienced a stair fall impact sustaining injuries to their left upper extremities.
MACHINERY · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Shovel operator stated jarring their left shoulder while operating the shovel mining out a ramp, and experienced left shoulder pain on 02/19/2025. Employee has a history of left shoulder injury. Employee continued to work full duty until receiving medical treatment for their left shoulder on 10/08/2025.
POWERED HAULAGE · DAYS AWAY FROM WORK ONLY
Accident narrative
Caterpillar 988K wheel loader was maintaining a shovel dig site when the left rear corner of the loader was contacted by loose material that fell from the dig face. The loader operator reported neck and back pain from being jostled in the cab. The left rear loader's fender and boarding ladder were damaged. The loader was taken out of service for repairs.
HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was racking brick in kiln. While holding a brick, EE hit left hand with the rawhide hammer, breaking EE's middle finger.
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While attempting to remove a wrapper rod, it fell down and struck employee in the right hand.
SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Operator was cleaning tripper for maintenance. Operator was traveling on tripper walkway when the operator slipped and fell on water/ice formation. Operator sustained dislocation of their right fifth finger.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Plant repairperson was discarding worn return roller into dumpster when the employee pinched their left index finger between the return roller and the dumpster. The employee sustained crushing injuries to their left index finger resulting in medical treatment.
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.
Cleveland-Cliffs InccontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422U.S. Steel Canada et alcontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422Cliffs Natural Resources Inc et alcontrolsTilden Mining Company L CoperatesTilden Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 2000422Cleveland-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.
Accidents and injuries
786 historical accident/injury rows; 1 coded fatalities and 11,010 lost days across the published record.
accidentsmine-production-quarterlyViolations 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.
inspectionsviolationsassessed-violationsorders-107aOccupational 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.
personal-health-samplesarea-samplesQuarterly production and employment
481K employee hours and 884 summed average employees across reported subunits in the latest published quarter.
mine-production-quarterlymine-production-yearlyContests, conferences and decisions
2,072 contested-violation rows, 2,085 civil-penalty docket/decision rows, and 107 conference records linked by issuance number.
conferencescontested-violationscivil-penalty-dockets-decisionsContractors
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.
contractor-production-quarterlycontractor-production-yearlyaccidentsviolationsInspections
361 inspection events and 37K published inspection hours across the historical record.
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 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.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
Coal dust, noise and other contaminants. Silica records above ↑
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
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.