MINE DETAILS
Hermosa Mine
MSHA MINE ID0203398
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Hermosa Mine31.46306, -110.72500Open 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
730,833reported 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 | 103,027 | 0.00 | 150 | 1/1 mines reporting |
| 2025 Q2 | 0 | 149,112 | 0.00 | 159 | 1/1 mines reporting |
| 2025 Q3 | 0 | 128,871 | 0.00 | 160 | 1/1 mines reporting |
| 2025 Q4 | 0 | 95,897 | 0.00 | 161 | 1/1 mines reporting |
| 2026 Q1 | 0 | 123,615 | 0.00 | 168 | 1/1 mines reporting |
| 2026 Q2 | 0 | 130,311 | 0.00 | 174 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
6510 significant & substantial (S&S)
Accident records
200 records classified as fatality
Proposed penalties · USD
57,449.0062 of 65 violations with amounts
On-site inspection hours
642.7520 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 | 14 | 6 | 13,162.00 | 4 | 0 | 3 | 53.0 |
| 2025-Q2 | 4 | 1 | 1,051.00 | 2 | 0 | 2 | 86.0 |
| 2025-Q3 | 13 | 0 | 30,656.00 | 1 | 0 | 3 | 103.8 |
| 2025-Q4 | 6 | 0 | 2,550.00 | 2 | 0 | 1 | 76.5 |
| 2026-Q1 | 3 | 1 | 700.00 | 6 | 0 | 1 | 88.5 |
| 2026-Q2 | 12 | 1 | 4,386.00 | 3 | 0 | 2 | 145.0 |
| 2026-Q3 | 13 | 1 | 4,944.00 | 2 | 0 | 7 | 90.0 |
| 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
Verbal Hazard Complaint Inspections · 0.0 on-site hours
103 (g) Written Notification Hazard Complaint Inspectio · 0.0 on-site hours
Verbal Hazard Complaint Inspections · 6.8 on-site hours
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
A mechanic was working on a pump in the vent shaft drill connex, the mechanic bent over to pick up a bolt off the floor and hit their head on the metal bench causing a laceration. The mechanic received staples to close the laceration.
Compliance Follow-up Inspection · 0.0 on-site hours
Verbal Hazard Complaint Inspections · 3.5 on-site hours
Spot Inspection · 1.0 on-site hours
57.19120 · S&S · $1,968.00 proposed
57.23003(b) · $151.00 proposed
57.23002(a)
48.29
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was parking the forklift at Hermosa Main Shaft. After securing the equipment by placing the wheel chocks, the employee reported pain in their lower back. Employee was prescribed a muscle relaxant.
57.6102(a)(1) · $151.00 proposed
57.16005 · $1,219.00 proposed
Verbal Hazard Complaint Inspections · 6.0 on-site hours
56.14100(b) · $549.00 proposed
56.14207 · $151.00 proposed
56.4201(a)(2) · $151.00 proposed
56.14100(b) · $151.00 proposed
56.12004 · $151.00 proposed
56.4203 · $151.00 proposed
56.14101(a)(2) · $151.00 proposed
Regular Safety and Health Inspection · 72.8 on-site hours
Verbal Hazard Complaint Inspections · 2.5 on-site hours
MACHINERY · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Employee was assisting with landing a tugger on the 3680 level. Two employees were pulling the tugger on to the level as it was lowered, two employees pulled from one side of the tugger and a third employee was pushing on the opposite side of the tugger. The tugger rolled over in the rigging, trapping and breaking the right arm of the employee between the tugger and the rigging.
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.
—
South32controlsSouth32 Hermosa Inc.operatesHermosa Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0203398—
Arizona Mining InccontrolsSouth32 Hermosa Inc.operatesHermosa Mine
msha-controller-operator-history · controller/operator co-tenure derived on mine 0203398Other 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
46 historical accident/injury rows; 0 coded fatalities and 510 lost days across the published record.
ACCIDENT + INJURY RECORD39 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
193 violation rows across the full record; 26 carry an S&S flag and $93,799 appears in current assessed amounts.
ENFORCEMENT ACTIVITY131 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
27 personal. 2 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 EXPOSURE27 samples
personal-health-samples04 / PRODUCTIONcontext
Quarterly production and employment
130K employee hours and 174 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
22 contested-violation rows, 22 civil-penalty docket/decision rows, and 17 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE61 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 CONTEXT21 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
64 inspection events and 3K published inspection hours across the historical record.
OVERSIGHT COVERAGE44 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 2 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 |
|---|---|---|---|---|---|
| No silica records match these filters. Missing samples do not establish safe conditions. | |||||
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 57.19120Procedures for inspection, testing, and maintenance.1 recent row ↗30 CFR 57.23003Requirements for written safety program.1 recent row ↗30 CFR 57.23002Written safety program.1 recent row ↗30 CFR 48.29Records of training.1 recent row ↗30 CFR 57.6102Explosive material storage practices.1 recent row ↗30 CFR 57.16005Securing gas cylinders.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.2 recent rows ↗30 CFR 56.14207Parking procedures for unattended equipment.1 recent row ↗
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
522124757.19120S&S
522124857.23003(b)Citation
504690957.23002(a)Citation
504690848.29Citation
522124657.6102(a)(1)Citation
504690757.16005Citation
522124556.14100(b)Citation
522124456.14207Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgMiner, Shaft Sinking
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgSkip Dumper, Toploader, Tipple Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source 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: 00.00Concentration: 0000.00 · 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: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC from EC @ 160Truck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
TC @ 160Truck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0160.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
15 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors46Aug 16, 2018—Sep 17, 2026mine-keyed
Addresses of Recordidentity · logistics1Jan 27, 2021—Jan 27, 2021mine-keyed
Assessed Violationscompliance · legal189Apr 18, 2018—Aug 19, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal22Aug 28, 2018—Mar 30, 2026mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal17May 30, 2018—May 12, 2025mine-keyed
Contested Violationscompliance · legal22Apr 18, 2018—Sep 2, 2025mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety3,122Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety659Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance2Mar 28, 2018—Mar 28, 2018mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance58Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance14Not published—Not publishedmine-keyed
Inspectionssafety · compliance64Apr 18, 2018—Oct 5, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety—No published rowsabsent / not applicable
Metal and Nonmetal Personal Health Sampleshealth · safety27Dec 12, 2018—Nov 5, 2025mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal193Apr 18, 2018—Aug 19, 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.