MINE DETAILS
HENDERSON OPERATIONS
MSHA MINE ID0500790
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- HENDERSON OPERATIONS39.77139, -105.84611Open 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
1,242,916reported 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 | 198,494 | 0.00 | 395 | 1/1 mines reporting |
| 2025 Q2 | 0 | 210,629 | 0.00 | 395 | 1/1 mines reporting |
| 2025 Q3 | 0 | 208,373 | 0.00 | 395 | 1/1 mines reporting |
| 2025 Q4 | 0 | 203,859 | 0.00 | 395 | 1/1 mines reporting |
| 2026 Q1 | 0 | 208,836 | 0.00 | 395 | 1/1 mines reporting |
| 2026 Q2 | 0 | 212,725 | 0.00 | 395 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
25250 significant & substantial (S&S)
Accident records
120 records classified as fatality
Proposed penalties · USD
150,422.00247 of 252 violations with amounts
On-site inspection hours
1,555.0028 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 | 31 | 5 | 17,947.00 | 1 | 0 | 3 | 202.0 |
| 2025-Q2 | 44 | 16 | 28,840.00 | 2 | 0 | 9 | 273.5 |
| 2025-Q3 | 28 | 5 | 11,481.00 | 2 | 0 | 3 | 170.3 |
| 2025-Q4 | 33 | 5 | 19,497.00 | 2 | 0 | 3 | 202.5 |
| 2026-Q1 | 37 | 7 | 27,480.00 | 1 | 0 | 2 | 268.3 |
| 2026-Q2 | 48 | 8 | 25,280.00 | 3 | 0 | 4 | 244.8 |
| 2026-Q3 | 31 | 4 | 19,897.00 | 1 | 0 | 4 | 193.8 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Impoundment Spot Inspection · 2.0 on-site hours
OTHER · DAYS AWAY FROM WORK ONLY
Accident narrative
On 9-9-26 @ ~1930 An employee was clearing a drift when they felt a pain in their ankle.
Compliance Follow-up Inspection · 2.0 on-site hours
57.14100(b) · S&S · $7,676.00 proposed
57.4160(a)(2)
57.9300(d) · $465.00 proposed
57.20003(a) · $245.00 proposed
57.12028 · $697.00 proposed
57.4601 · $209.00 proposed
47.41(a) · $151.00 proposed
57.4400
57.18002(d) · $151.00 proposed
57.9300(d)(1) · $1,550.00 proposed
57.12002 · $465.00 proposed
57.20003(a) · $245.00 proposed
57.12004 · $193.00 proposed
57.14112(b) · $209.00 proposed
57.20003(b) · $151.00 proposed
57.4101 · $151.00 proposed
57.12028 · $2,503.00 proposed
47.44(b) · $151.00 proposed
57.4104(a) · S&S · $313.00 proposed
57.12028 · $755.00 proposed
57.16005 · $151.00 proposed
57.12018 · $465.00 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.
—
Freeport-McMoRan InccontrolsClimax Molybdenum CompanyoperatesHENDERSON OPERATIONS
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500790—
Phelps Dodge CorpcontrolsClimax Molybdenum CompanyoperatesHENDERSON OPERATIONS
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500790—
Cyprus Amax Minerals CompanycontrolsClimax Molybdenum CompanyoperatesHENDERSON OPERATIONS
msha-controller-operator-history · controller/operator co-tenure derived on mine 0500790Other 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
314 historical accident/injury rows; 0 coded fatalities and 6,142 lost days across the published record.
ACCIDENT + INJURY RECORD38 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
2,063 violation rows across the full record; 336 carry an S&S flag and $804,733 appears in current assessed amounts.
ENFORCEMENT ACTIVITY561 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
1,147 personal; 51 area. 35 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 EXPOSURE1K samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
213K employee hours and 395 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
128 contested-violation rows, 130 civil-penalty docket/decision rows, and 77 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE335 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 CONTEXT65 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
277 inspection events and 29K published inspection hours across the historical record.
OVERSIGHT COVERAGE79 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 168 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 |
|---|---|---|---|---|---|
| 000000202602207600 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 0.41× published limitConcentration: 0000.29 · limit: 0000.71Source unit unspecified | Not reported | NO ACTIONInspection F0345A4 |
| 000000202602207700 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 1.03× published limitConcentration: 0000.69 · limit: 0000.67Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F0345A4 |
| 000000202602207800 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Laborer, Bullgang | 0.78× published limitConcentration: 0000.57 · limit: 0000.73Source unit unspecified | Not reported | NO ACTIONInspection F0345A4 |
| 000000202602207900 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Laborer, Bullgang | 0.47× published limitConcentration: 0000.31 · limit: 0000.66Source unit unspecified | Not reported | NO ACTIONInspection F0345A4 |
| 000000202601570300 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 0.45× published limitConcentration: 0000.26 · limit: 0000.58Source unit unspecified | Not reported | NO ACTIONInspection F03459D |
| 000000202600763000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 0.37× published limitConcentration: 0000.17 · limit: 0000.46Source unit unspecified | Not reported | NO ACTIONInspection F01CB53 |
| 000000202600763100 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Belt Crew | 1.38× published limitConcentration: 0001.10 · limit: 0000.80Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F01CB53 |
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 57.14100Safety defects; examination, correction and records.1 recent row ↗30 CFR 57.4160Underground electric substations and liquid storage facilities.1 recent row ↗30 CFR 57.9300Berms or guardrails.2 recent rows ↗30 CFR 57.20003Housekeeping.2 recent rows ↗30 CFR 57.12028Testing grounding systems.1 recent row ↗30 CFR 57.4601Oxygen cylinder storage.1 recent row ↗30 CFR 47.41Requirement for container labels.1 recent row ↗30 CFR 57.4400Use restrictions.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
521333557.14100(b)S&S
521333457.4160(a)(2)Citation
521333357.9300(d)Citation
521135257.20003(a)Citation
521135157.12028Citation
658236257.4601Citation
658236147.41(a)Citation
658236057.4400Citation
Coal dust, noise and other contaminants. Silica records above ↑
TC from EC @ 160Complete Load-Haul-Dump
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Complete Load-Haul-Dump
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONComplete Load-Haul-Dump
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
EC @ 160Complete Load-Haul-Dump
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Mucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Mucking Mach. Operator
C/E: 00.32Concentration: 0051.00 · limit: 0160.00Source unit unspecified
ORGANIC CARBONMucking Mach. Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
EC @ 160Mucking Mach. Operator
C/E: 00.32Concentration: 0051.00 · limit: 0160.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors314Jan 5, 2000—Sep 9, 2026mine-keyed
Addresses of Recordidentity · logistics1Feb 15, 1973—Feb 15, 1973mine-keyed
Assessed Violationscompliance · legal2,036Mar 14, 2000—Aug 5, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal130Nov 19, 2003—May 12, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal77Apr 13, 2000—Nov 20, 2025mine-keyed
Contested Violationscompliance · legal128Feb 5, 2005—Aug 28, 2025mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety9,522Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety1,983Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance3Jan 1, 1950—Oct 22, 1999mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance424Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance108Not published—Not publishedmine-keyed
Inspectionssafety · compliance277Mar 3, 2000—Sep 10, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety51Apr 14, 2010—Jun 2, 2026mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety1,147Jun 5, 2001—Jun 2, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal2,063Mar 14, 2000—Aug 5, 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.