MINE DETAILS
Freeport-McMoRan Sierrita Ops.
MSHA MINE ID0200144
LOCATION
Mine location
1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Freeport-McMoRan Sierrita Ops.31.87583, -111.10111Open 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
4,067,210reported 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 | 674,806 | 0.00 | 1,308 | 1/1 mines reporting |
| 2025 Q2 | 0 | 694,775 | 0.00 | 1,304 | 1/1 mines reporting |
| 2025 Q3 | 0 | 678,367 | 0.00 | 1,382 | 1/1 mines reporting |
| 2025 Q4 | 0 | 661,620 | 0.00 | 1,350 | 1/1 mines reporting |
| 2026 Q1 | 0 | 671,104 | 0.00 | 1,293 | 1/1 mines reporting |
| 2026 Q2 | 0 | 686,538 | 0.00 | 1,326 | 1/1 mines reporting |
| 2026 Q3 | — | — | — | — | No report |
| 2026 Q4 | — | — | — | — | No report |
Safety and enforcement
2025-01-01 – 2026-10-13
Violations
15531 significant & substantial (S&S)
Accident records
600 records classified as fatality
Proposed penalties · USD
169,000.00150 of 155 violations with amounts
On-site inspection hours
707.0023 inspections · 23 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 | 0 | 0 | — | 5 | 0 | 1 | 7.0 |
| 2025-Q2 | 38 | 8 | 84,998.00 | 13 | 0 | 5 | 192.0 |
| 2025-Q3 | 1 | 0 | 193.00 | 11 | 0 | 2 | 4.5 |
| 2025-Q4 | 3 | 1 | 1,120.00 | 6 | 0 | 2 | 3.0 |
| 2026-Q1 | 69 | 19 | 58,051.00 | 5 | 0 | 3 | 277.5 |
| 2026-Q2 | 0 | 0 | — | 12 | 0 | 3 | 15.5 |
| 2026-Q3 | 44 | 3 | 24,638.00 | 8 | 0 | 7 | 207.5 |
| 2026-Q4 * | 0 | 0 | — | 0 | 0 | 0 | — |
Most cited CFR sections
All violations issued in the selected period. Counts combine subsections.
Safety activity
Compliance Follow-up Inspection · 1.8 on-site hours
MACHINERY · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was adjusting an HDPE pipe fusing machine to align with a bleeder when the employee's right hand struck the clamp, causing it to close on the left middle finger. The clamp did not lock, allowing the employee to open it and remove the finger.
OTHER · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was completing the first round in Moly Leach and experienced lower right back pain and stiffness while ascending stairs and using the right arm for support. Employee reported feeling the lower right back "lock up". Employee was placed on restricted duty.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was reinstalling grating employee hand caught between grating and handrail.
56.20010 · S&S
Impoundment Spot Inspection · 8.3 on-site hours
103 (g) Written Notification Hazard Complaint Inspectio · 3.8 on-site hours
103 (g) Written Notification Hazard Complaint Inspectio · 5.5 on-site hours
DISORDERS (PHYSICAL AGENTS) · OCCUPATNAL ILLNESS NOT DEG 1-6
Accident narrative
Employee was performing a 250-hour service on a dozer outdoors and assisting with filter replacement when heat exposure and physical exertion contributed to signs of heat stress, including excessive sweating; work was stopped and first aid was initiated in a shaded area. Impairment was limited to heat stress symptoms with no reported physical injury or permanent damage.
HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
While parked and eating peanuts, the employee bit down on a peanut and chipped a tooth. The employee initially experienced minimal discomfort and continued working; however, approximately 90 minutes later, the pain increased and became intolerable, prompting the employee to notify a supervisor. Damage consisted of a chipped tooth resulting in dental pain requiring evaluation.
OTHER · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee was completing paperwork near EE's toolbox in Bay 4 of the Truck Shop when a gust of wind blew dust/debris into EE's right eye. The employee was wearing safety glasses at the time of the incident.
103 (g) Written Notification Hazard Complaint Inspectio · 5.0 on-site hours
POWERED HAULAGE · DAYS AWAY FROM WORK ONLY
Accident narrative
Haul truck operator reported not feeling well after the truck had been rough loaded.
Spot Inspection · 0.0 on-site hours
56.12004 · $313.00 proposed
56.14132(b)(2) · $165.00 proposed
56.14100(b) · $165.00 proposed
56.14205 · $1,219.00 proposed
56.4200(b)(2) · $151.00 proposed
48.27(a) · $366.00 proposed
56.14205 · $165.00 proposed
56.14100(b) · $165.00 proposed
48.27(a) · $366.00 proposed
56.14107(a) · $755.00 proposed
56.14101(a)(2) · $366.00 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 InccontrolsFreeport-McMoRan Sierrita Ops.operatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144—
Phelps Dodge CorpcontrolsFreeport-McMoRan Sierrita Ops.operatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144—
Cyprus Amax Minerals CompanycontrolsCyprus Sierrita CorpoperatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144—
Pennzoil CompanycontrolsDuval CorpoperatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144Other 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
797 historical accident/injury rows; 0 coded fatalities and 10,412 lost days across the published record.
ACCIDENT + INJURY RECORD190 since 2021
accidentsmine-production-quarterly02 / COMPLIANCEwatch
Violations and penalties
2,519 violation rows across the full record; 470 carry an S&S flag and $2,031,777 appears in current assessed amounts.
ENFORCEMENT ACTIVITY492 since 2021
inspectionsviolationsassessed-violationsorders-107a03 / HEALTHwatch
Occupational health samples
224 personal; 22 area. 31 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 EXPOSURE246 samples
personal-health-samplesarea-samples04 / PRODUCTIONcontext
Quarterly production and employment
687K employee hours and 1,326 summed average employees across reported subunits in the latest published quarter.
2026-Q20 tons
mine-production-quarterlymine-production-yearly05 / LEGALwatch
Contests, conferences and decisions
370 contested-violation rows, 377 civil-penalty docket/decision rows, and 36 conference records linked by issuance number.
POST-ISSUANCE LIFECYCLE783 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 CONTEXT97 linked entities
contractor-production-quarterlycontractor-production-yearlyaccidentsviolations07 / INSPECTIONScontext
Inspections
228 inspection events and 18K published inspection hours across the historical record.
OVERSIGHT COVERAGE72 since 2021
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 13, 2026. 100 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 |
|---|---|---|---|---|---|
| 000000202600678700 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 1.01× published limitConcentration: 0000.71 · limit: 0000.70Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F00330B |
| 000000202600678800 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Mechanic | 0.5× published limitConcentration: 0000.32 · limit: 0000.64Source unit unspecified | Not reported | NO ACTIONInspection F00330B |
| 000000202600678900 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 1.1× published limitConcentration: 0000.67 · limit: 0000.61Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F00330B |
| 000000202600679000 | Metal/nonmetal personalQuartz, respirable, >1% Qtz | Crusher Oper/Worker | 1.06× published limitConcentration: 0000.67 · limit: 0000.63Source unit unspecified | Not reported | LAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F00330B |
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 56.20010Retaining dams.1 recent row ↗30 CFR 56.12004Electrical conductors.1 recent row ↗30 CFR 56.14132Horns and backup alarms.1 recent row ↗30 CFR 56.14100Safety defects; examination, correction and records.2 recent rows ↗30 CFR 56.14205Machinery, equipment, and tools.2 recent rows ↗30 CFR 56.4200General requirements.1 recent row ↗30 CFR 48.27Training of miners assigned to a task in which they have had no previous experience; minimum courses of instruction.2 recent rows ↗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.
505939556.20010S&S
504577556.12004Citation
522118056.14132(b)(2)Citation
522117956.14100(b)Citation
505290056.14205Citation
504577456.4200(b)(2)Citation
522117848.27(a)Citation
504577356.14205Citation
Coal dust, noise and other contaminants. Silica records above ↑
Respirable dust, <.1mgTruck Driver
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgDrill Operator, Rotary
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgFront-end Loader Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
Respirable dust, <.1mgBulldozer Operator
C/E: 00.00Concentration: 0000.00 · limit: 0000.00Source unit unspecified
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
DATASETROWSWINDOWSTATUS
Accident, Injuries, and Illnessessafety · contractors797Jan 4, 2000—Sep 21, 2026mine-keyed
Addresses of Recordidentity · logistics1Apr 1, 1986—Apr 1, 1986mine-keyed
Assessed Violationscompliance · legal2,504Apr 6, 2000—Jul 31, 2026mine-keyed
Civil Penalty Dockets and Decisionscompliance · legal377Jul 7, 2000—Dec 12, 2025mine-keyed
Coal Dust Sampleshealth · safety—No published rowsabsent / not applicable
Conferencescompliance · legal36Jul 6, 2000—Nov 2, 2020mine-keyed
Contested Violationscompliance · legal370Sep 28, 2005—Jul 22, 2026mine-keyed
Contractor Employment and Production — Quarterlycontractors · production · safety13,098Not published—Not publishedentity-linked
Contractor Employment and Production — Yearlycontractors · production · safety2,673Not published—Not publishedentity-linked
Controller and Operator Historyidentity · compliance4Jan 1, 1950—Jan 1, 2000mine-keyed
Mine Employment and Production — Quarterlyproduction · safety · compliance318Not published—Not publishedmine-keyed
Mine Employment and Production — Yearlyproduction · safety · compliance81Not published—Not publishedmine-keyed
Inspectionssafety · compliance228Apr 3, 2000—Sep 23, 2026mine-keyed
Minesidentity · production · logistics1Not published—Not publishedmine-keyed
Metal and Nonmetal Area Sampleshealth · safety22Jan 13, 2015—Jan 13, 2015mine-keyed
Metal and Nonmetal Personal Health Sampleshealth · safety224Feb 5, 2002—Feb 19, 2026mine-keyed
Noise Sampleshealth · safety · equipment—No published rowsabsent / not applicable
Quartz Samples — Coalhealth · safety—No published rowsabsent / not applicable
Violationscompliance · safety · legal2,519Apr 6, 2000—Sep 10, 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.