MINE DETAILS
Mt Pass Mine & Mill
MSHA MINE ID0402542
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Mt Pass Mine & Mill35.47194, -115.57444Open 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
2,427,742reported 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 | 568,060 | 0.00 | 1,260 | 1/1 mines reporting |
| 2025 Q2 | 0 | 352,638 | 0.00 | 648 | 1/1 mines reporting |
| 2025 Q3 | 0 | 332,875 | 0.00 | 659 | 1/1 mines reporting |
| 2025 Q4 | 0 | 438,735 | 0.00 | 718 | 1/1 mines reporting |
| 2026 Q1 | 0 | 326,099 | 0.00 | 727 | 1/1 mines reporting |
| 2026 Q2 | 0 | 409,335 | 0.00 | 737 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
12222 significant & substantial (S&S)
Accident records
350 records classified as fatality
Proposed penalties · USD
136,685.00121 of 122 violations with amounts
On-site inspection hours
349.0020 inspections · 20 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 | 20 | 3 | 12,304.00 | 5 | 0 | 1 | 64.8 |
| 2025-Q2 | 14 | 3 | 13,764.00 | 2 | 0 | 4 | 85.8 |
| 2025-Q3 | 15 | 3 | 18,217.00 | 2 | 0 | 3 | 6.8 |
| 2025-Q4 | 0 | 0 | — | 6 | 0 | 1 | 4.0 |
| 2026-Q1 | 31 | 6 | 59,229.00 | 8 | 0 | 2 | 75.0 |
| 2026-Q2 | 5 | 0 | 2,586.00 | 8 | 0 | 3 | 14.5 |
| 2026-Q3 | 37 | 7 | 30,585.00 | 4 | 0 | 6 | 98.3 |
| 2026-Q4 * | 0 | 0 | — | 0 | 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
Glass broke in hand causing laceration on palm
OTHER · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was walking outside and dust blew into EE's eyes.
Compliance Follow-up Inspection · 0.0 on-site hours
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
taking sample and hot water got into boot causing burns
Verbal Hazard Complaint Inspections · 4.3 on-site hours
56.11001 · S&S · $1,219.00 proposed
HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
cut hand with box cutter, 4 stiches to left hand.
Impoundment Spot Inspection · 2.5 on-site hours
50.20-1 · $151.00 proposed
56.12028 · $2,712.00 proposed
56.23003(b) · $151.00 proposed
56.18002(a) · S&S · $1,431.00 proposed
56.12019 · $288.00 proposed
56.14205 · S&S · $1,431.00 proposed
56.20003(a) · S&S · $1,431.00 proposed
56.14107(a) · S&S · $4,749.00 proposed
56.12002 · $432.00 proposed
56.20003(a) · $959.00 proposed
56.15006 · $432.00 proposed
56.20003(a) · $288.00 proposed
56.12032 · $288.00 proposed
56.20008(b) · $151.00 proposed
56.4101 · $151.00 proposed
56.4101 · $151.00 proposed
56.12028 · $288.00 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.
—
MP Materials CorporationcontrolsMP Mine Operations, LLC.operatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Saratoga Park Ltd et alcontrolsMP Mine Operations, LLC.operatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
JHL Capital Group Holdings Two LLC et alcontrolsMP Mine Operations, LLC.operatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Molycorp InccontrolsMolycorp MineralsoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Traxys North America LLC et alcontrolsMolycorp MineralsoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Resource Capital Funds et alcontrolsMolycorp MineralsoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Chevron CorporationcontrolsChevron Mining IncoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Chevron CorporationcontrolsMolycorp IncoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542—
Unocal CorpcontrolsMolycorp IncoperatesMt Pass Mine & Mill
msha-controller-operator-history · controller/operator co-tenure derived on mine 0402542Other 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
213 historical accident/injury rows; 0 coded fatalities and 780 lost days across the published record.
ACCIDENT + INJURY RECORD72 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
1,089 violation rows across the full record; 219 carry an S&S flag and $618,091 appears in current assessed amounts.
ENFORCEMENT ACTIVITY272 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHcontext
Occupational health samples
87 personal; 2 area. 0 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 EXPOSURE89 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
409K employee hours and 737 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
204 contested-violation rows, 206 civil-penalty docket/decision rows, and 57 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE467 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 CONTEXT74 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
208 inspection events and 7K published inspection hours across the historical record.
OVERSIGHT COVERAGE76 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 12 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 |
|---|---|---|---|---|---|
| 000000202602955000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Lab Technician | 0× published limitConcentration: 0000.31 · limit: 0000.00Source unit unspecified | Not reported | NO ACTIONInspection F031E32 |
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 56.11001Safe access.1 recent row ↗30 CFR 50.20-1General instructions for completing MSHA Form 7000-1.1 recent row ↗30 CFR 56.12028Testing grounding systems.1 recent row ↗30 CFR 56.23003Requirements for written safety program.1 recent row ↗30 CFR 56.18002Examination of working places.1 recent row ↗30 CFR 56.12019Access to stationary electrical equipment or switchgear.1 recent row ↗30 CFR 56.14205Machinery, equipment, and tools.1 recent row ↗30 CFR 56.20003Housekeeping.2 recent rows ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
510828956.11001S&S
510825750.20-1Citation
510397656.12028Citation
510825656.23003(b)Citation
510825556.18002(a)S&S
510825456.12019Citation
510825356.14205S&S
510825256.20003(a)S&S
Coal dust, noise and other contaminants. Silica records above ↑
Unlisted Particulate, respirable, <1% QtzPackaging Operations Worker
C/E: 00.00Concentration: 0000.27 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgPackaging Operations Worker
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Vanadium dustCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0500.00Source unit unspecified
Nickel dust & saltsCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0001.00Source unit unspecified
Molybdenum dustCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0010.00Source unit unspecified
Manganese dustCrusher Oper/Worker
C/E: 00.00Concentration: 0000.01 · limit: 0005.00Source unit unspecified
Lead, inorganic dustCrusher Oper/Worker
C/E: 00.06Concentration: 0009.00 · limit: 0150.00Source unit unspecified
Copper dust and mistCrusher Oper/Worker
C/E: 00.00Concentration: 0000.00 · limit: 0001.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors213Feb 27, 2000—Sep 11, 2026mine-keyed
Addresses of Recordidentity · logistics1Dec 13, 2017—Dec 13, 2017mine-keyed
Assessed Violationscompliance · legal1,079Feb 9, 2000—Aug 17, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal206Aug 17, 2011—Oct 2, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal57Jun 1, 2012—Jan 26, 2024mine-keyed
Contested Violationscompliance · legal204Nov 8, 2010—Mar 6, 2025mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety8,478Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,725Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance9Jan 1, 1950—Dec 11, 2017mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance293Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance77Not published—Not publishedmine-keyed
Inspectionssafety · compliance208Feb 8, 2000—Aug 27, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety2Feb 21, 2009—Feb 21, 2009mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety87Dec 12, 2001—Jul 21, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal1,089Feb 9, 2000—Aug 17, 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.