MSHA DATABASEMSHA records · 16 contributing sources · snapshot Oct 18, 2026

MINE DETAILS

Freeport-McMoRan Sierrita Ops.

ActiveSurfaceCopper Ore NEC
MSHA MINE ID0200144
LOCATIONPima, AZ
PUBLIC RECORD23,253 linked rows

LOCATION

Mine location

1 of 1 mine with usable MSHA coordinates. Select a marker to open a mine.

Mine coordinates

2025-01-01 – 2026-10-18Applies to production, safety and portfolio metrics. Silica samples have separate filters.

Violations

155

31 significant & substantial (S&S)

  1. 2025 Q10
  2. 2025 Q238
  3. 2025 Q31
  4. 2025 Q43
  5. 2026 Q169
  6. 2026 Q20
  7. 2026 Q344
  8. 2026 Q4 *0

Accident records

60

0 records classified as fatality

  1. 2025 Q15
  2. 2025 Q213
  3. 2025 Q311
  4. 2025 Q46
  5. 2026 Q15
  6. 2026 Q212
  7. 2026 Q38
  8. 2026 Q4 *0

Proposed penalties · USD

169,000.00

150 of 155 violations with amounts

  1. 2025 Q1—
  2. 2025 Q284,998
  3. 2025 Q3193
  4. 2025 Q41,120
  5. 2026 Q158,051
  6. 2026 Q2—
  7. 2026 Q324,638
  8. 2026 Q4 *—

On-site inspection hours

707.00

23 inspections · 23 with hours

  1. 2025 Q17.00
  2. 2025 Q2192.00
  3. 2025 Q34.50
  4. 2025 Q43.00
  5. 2026 Q1277.50
  6. 2026 Q215.50
  7. 2026 Q3207.50
  8. 2026 Q4 *—
Quarterly safety data
QuarterViolationsS&SProposed USDAccident recordsFatality recordsInspectionsOn-site hours
2025-Q100—5017.0
2025-Q238884,998.001305192.0
2025-Q310193.0011024.5
2025-Q4311,120.006023.0
2026-Q1691958,051.00503277.5
2026-Q200—120315.5
2026-Q344324,638.00807207.5
2026-Q4 *00—000—

Most cited CFR sections

All violations issued in the selected period. Counts combine subsections.

Safety activity

  1. accident220260080003

    HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY

    Accident narrative

    During routine maintenance of the secondary slitter, the mechanic was adjusting the cutting wheels. While loosening the set screw, the employee's right hand thumb area made contact with the cutting blade, resulting in a laceration.

  2. accident220253640003

    SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    While walking the third floor of the secondary crusher area, the employee reported stepping on an uneven surface and subsequently experienced a sensation in the left leg.

  3. accident220253170714

    MACHINERY · DAYS AWAY FROM WORK ONLY

    Accident narrative

    CAT79 experienced a rough load event while being loaded by Shovel 44, positioned on the outer edge of the cut and working in course material.

  4. accident220253170708

    MACHINERY · DAYS AWAY FROM WORK ONLY

    Accident narrative

    Haul truck CAT82 was in the process of being loaded by Shovel 44 when, during the initial bucket load, a concealed boulder within the material struck the truck bed, resulting in a rough loading event.

  5. accident220253170181

    OCCUPATIONAL SKIN DISEASES · OCCUPATNAL ILLNESS NOT DEG 1-6

    Accident narrative

    At 4 am a haul truck operator began to feel itchy. EE went to the restroom and discovered red bumps (rash) on EE's body. EE notified supervision.

  6. accident220253170180

    HANDLING OF MATERIALS · PERM TOT OR PERM PRTL DISABLTY

    Accident narrative

    EE was installing belt on pulley. EE's finger became caught between the pulley and the belt, amputating the tip of EE's right ring finger. EE was taken to the hospital for treatment. Taken off work.

  7. accident220253170058

    HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    EE was working on cleaning out mixer. EE picked up a pry bar to break loose hardened material from mixer flights. While doing so, the ee hit the buildup of material and the force from pry bar hit EE in the face near EE's eyebrow / forehead area. EE suffered a laceration and needed stitches.

  8. accident220253170057

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    EE was using a swing gate to access a ladder. When EE let go of the gate, it swung back closed. The EE's finger was struck and it began to swell. Near the end of shift the EE informed supervision of the incident. EE was taken to the clinic and x-rays were done. EE had fractured EE's middle finger. EE was taken off work.

  9. accident220253170519

    FALLING/SLIDING/ROLLING MATERIALS · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    clock fell off the wall striking employee in the left arm

  10. accident220253170056

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    EE was assisting a group of co-workers with moving a Knaack box into the Crush/Convey maintenance shop. EE was lifting on side of the box and then they realized they needed additional help due to the box being too heavy. After they were done the EE began to feel lower back pain. EE was seen and released. On 9/29/25 EE was issued Physical Therapy.

  11. accident220253170030

    MACHINERY · DAYS AWAY FROM WORK ONLY

    Accident narrative

    EE was removing a 20" hugger with an impact when the nut came off of the bottom half of the hugger it dropped. The EE caught it and tweaked EE's back in the process. On 9/19/25 EE was seen and sent back to work. On 9/25/2025 EE was issued physical therapy.

  12. accident220252580031

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    EE was working on greasing fine ore feeder motors. They picked up a grease gun & felt a pop in their elbow. They continued to work & grabbed the grease gun again & felt another pop with instant pain. They reported it to supervision & was seen at the clinic & released. On 9/10/25 they went back to the clinic & was issued restrictions for an elbow strain.

  13. accident220252450026

    OCCUPATIONAL SKIN DISEASES · OCCUPATNAL ILLNESS NOT DEG 1-6

    Accident narrative

    Employee was changing a sump pump while working in a muddy area; irritation from right foot friction with muck boots resulted in localized swelling and redness. Reported to supervisor on 08/25/25.

  14. accident220252300008

    ENTRAPMENT · ACCIDENT ONLY

    Accident narrative

    On 8/7/2025, Mill control stated that an employee was stuck in the east freight elevator at the mill. MSHA was notified and at 1:06 pm the EE was freed from the elevator. Elevator company was dispatched to scene and freed the EE. Investigation is on-going.

  15. accident220252160025

    HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY

    Accident narrative

    During the harvest process at Tankhouse, ee had to remove a cathode, weighing approx. 152 lbs on the strongback prior to unloading. The ee lowered the strongback to approx. shoulder height to detach the cathode by removing the hanger bar. The loop failed and broke off, landing on the ee's foot. EE sustained a fracture and laceration. Received stitches and taken off work.

  16. accident220252040012

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    EE was ball charging in the Mill. The bin became low. They used a ball to throw up into the bin to attempt to get more balls to come down. EE was wearing impact gloves. The balls started to come down and pinched their left pinky finger, causing a fracture to the distal tuft (tip of finger). Was released back to work wrapped with coban.

  17. accident220251950015

    HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY

    Accident narrative

    RAM Belt Team was performing work on the 8D feeder belt. While maneuvering the I-beam on the deck, two RAM employees - one pulling and one pushing - attempted to slide the I-beam into position. During this process, one team member's right pinky finger was pinched between the I-beam and the structure.

  18. accident220251840007

    SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY

    Accident narrative

    EE was dismounting a haul truck from night shift. EE was on the lower platform of the truck when EE's backpack became hung up on the handrail. As EE was trying to free the backpack, EE lost EE's footing and fell to the ground. EE sustained a laceration to EE's face and soreness in EE's neck. EE received 13 stitches and was taken off work.

  19. accident220251840003

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    EE was removing placement bars on the reject chute cover. The last bar was under tension and when it released it struck EE in the face. EE sustained a broken tooth and a laceration to EE's mouth. EE received 8 stitches.

  20. accident220251740017

    ENTRAPMENT · ACCIDENT ONLY

    Accident narrative

    1 EE was inside the Primary Crusher elevator when it stopped. The elevator would not move.

  21. accident220252340024

    SLIP OR FALL OF PERSON · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    EE was providing a site tour to auditors. EE was walking out of the man van and twisted an ankle without feeling pain. EE notified supervisor was treated and released. On 8/13/2025 they were diagnosed with a nondisplaced microtrbecular fracture. EE was also issued PT.

  22. accident220251840005

    DISORDERS (PHYSICAL AGENTS) · OCCUPATNAL ILLNESS NOT DEG 1-6

    Accident narrative

    EE was showing other employees how the computers are utilized in the office building. EE began to feel ill. ERT was contacted and EE was taken to the hospital for further evaluation. Diagnosed with dehydration.

  23. accident220251340010

    HANDTOOLS (NONPOWERED) · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Employee was working on a buggy whip when the screwdriver being utilized slipped and penetrated the right index finger. Employee received stitches and was released to work.

  24. accident220251210004

    FIRE · ACCIDENT ONLY

    Accident narrative

    Motor grader fire. Unknown cause. Operator exited equipment and issued a Mayday. Local fire department and FMI water trucks responded.

  25. accident220251280009

    HANDLING OF MATERIALS · NO DYS AWY FRM WRK,NO RSTR ACT

    Accident narrative

    Employee was removing liner plates. While handing an 8" x 4' piece from the regrind cell to the employee standing on the deck. Their finger was caught between the piece and the handrail.

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.

CURRENT HIERARCHYFreeport-McMoRan Inc → Freeport-McMoRan Sierrita Ops. → Freeport-McMoRan Sierrita Ops.
HISTORY RECORDS411 relationships
INTERVAL CHECKPASScontroller/operator overlap
—

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 0200144
Other 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-quarterly
02 / 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-107a
03 / 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-samples
04 / 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-yearly
05 / 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-decisions
06 / 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-yearlyaccidentsviolations
07 / INSPECTIONScontext

Inspections

228 inspection events and 18K published inspection hours across the historical record.

OVERSIGHT COVERAGE72 since 2021
inspectionsviolations

HEALTH SAMPLING

Silica and quartz

Matching records40 coal · 4 personal · 0 area
Sample status0 not voided0 voided · 4 status not reported
Personal samples with C/E > 134 published ratios · not a citation count
2026 · Feb 19, 2026–Feb 19, 2026
Date / sampleDataset / analyteOccupation / areaMeasurementSample statusPublished action
000000202600678700Metal/nonmetal personalQuartz, respirable, >1% QtzMechanic1.01× published limitConcentration: 0000.71 · limit: 0000.70Source unit unspecifiedNot reportedLAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F00330B
000000202600678800Metal/nonmetal personalQuartz, respirable, >1% QtzMechanic0.5× published limitConcentration: 0000.32 · limit: 0000.64Source unit unspecifiedNot reportedNO ACTIONInspection F00330B
000000202600678900Metal/nonmetal personalQuartz, respirable, >1% QtzCrusher Oper/Worker1.1× published limitConcentration: 0000.67 · limit: 0000.61Source unit unspecifiedNot reportedLAB RESULTS INDICATE EXPOSURE LIMIT EXCEEDEDInspection F00330B
000000202600679000Metal/nonmetal personalQuartz, respirable, >1% QtzCrusher Oper/Worker1.06× published limitConcentration: 0000.67 · limit: 0000.63Source unit unspecifiedNot reportedLAB 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.

RECENT PUBLIC RECORDS

Recent violations and samples

Latest records retained for inspection; aggregates above use the full source history.

VIOLATIONS12 latest shown
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
OTHER HEALTH SAMPLES4 latest shown

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.