MINE DETAILS
Freeport-McMoRan Sierrita Ops.
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 · 2026-10-18. 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 – 2026-10-18
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
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.
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.
POWERED HAULAGE · DAYS AWAY FROM WORK ONLY
Accident narrative
Haul truck operator reported not feeling well after the truck had been rough loaded.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee was opening a flush water ball valve to the tails launder in the mill basement. The valve was difficult to operate, so the employee used a wheel chock to strike the valve in an attempt to open it. During the task, the employee sustained an injury to the left shoulder.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Hand of employee was caught between truck bed and davit arm assembly when loading equipment into bed.
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee tripped while walking between the motor and handrail to assist a coworker and fell onto the grating, resulting in a pinky finger injury.
SLIP OR FALL OF PERSON · DYS AWY FRM WRK & RESTRCTD ACT
Accident narrative
Employee was backing up pulling vacuum pipe out of sump and EE's foot got caught on vacuum breaker causing EE to loose EE's balance. EE rotated and landed on EE's right knee as EE was trying to catch self.
SLIP OR FALL OF PERSON · ALL OTHER CASES (INCL 1ST AID)
Accident narrative
Individual attempted to dismount forklift via side steps, overstepped the last step causing to fall backwards. Individual attempted to stop impact from fall by extending arm. Left wrist was sprained in the process. Individual was seen by onsite medical team and refused further treatment, as EE didn't feel it was necessary.
HANDTOOLS (NONPOWERED) · DAYS AWAY FROM WORK ONLY
Accident narrative
While removing a bed pin, stored energy in the component caused it to suddenly dislodge and shift the bed. The uncontrolled movement allowed the brass bar to slip and drop, pinning the employee's hand against the tire. Resulted in a hand injury from impact/pinch force.
POWERED HAULAGE · DAYS AWAY FROM WORK ONLY
Accident narrative
Loose material during loading allowed a rock to roll from the bucket and strike Cat 75, causing a rough load event. The impact broke the rear window. The operator later developed back pain and required clinic evaluation by ERT.
SLIP OR FALL OF PERSON · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
The employee met with supervisors in a parking lot on the east side of the building. After the conversation, EE turned to walk back to the office and tripped over a wheel chock (angle iron) because EE did not fully clear it. EE fell onto EE's right knee and elbow. EE was wearing steel-toe boots, and no other PPE was involved.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee felt a groin strain while cleaning but delayed reporting it until the end of the shift when the pain persisted.
STRIKING OR BUMPING · NO DYS AWY FRM WRK,NO RSTR ACT
Accident narrative
Employee inspecting a hose stood up in a confined space and struck their hard hat on a frame causing their jaw to snap shut and chip a tooth with a minor gum laceration.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee used Brakleen to remove hydraulic oil from their hands; after doing so they took a smoke break causing burns to their hands.
HANDLING OF MATERIALS · DAYS AWAY FROM WORK ONLY
Accident narrative
The operator was dismounting equipment using a ladder when they experienced pain and noted swelling in the knee.
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While cleaning a flowmeter for install, employee cut right finger on the sensor requiring stitches.
HANDLING OF MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
While employee was removed tires from a connex for delivery, they noticed overlap of tires with an adjacent stack. As additional force was used to move the overlapped tire, the adjacent stack became unstable causing some tires to fall and strike the employee which resulted in the employee falling and straining their back.
MACHINERY · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
Employee was tailing a core tube out from a ct-20 to pull the sample. While tailing out the tube, the Kelly hose snagged on the wire line causing slack. As the tube came up changing the angle releasing the slack, dropping the back side of the tube 1 foot causing a strain on the helper right shoulder
POWERED HAULAGE · DAYS AWAY FROM WORK ONLY
Accident narrative
Employee experienced eye irritation from an unknown particle and attempted to flush their eye; later in the shift the irritation persisted and the employee was seen for an eye abrasion.
DISORDERS (REPEATED TRAUMA) · OCCUPATNAL ILLNESS NOT DEG 1-6
Accident narrative
On 1.21.2026 Employee reported soreness in the right bicep that developed over time while performing normal work duties. Employee noted that on 1.16.2026 EE's shoulder had popped while adding a stick of HWT pipe to a drill string going in. Employee also noted that EE's shoulders pop on occasionally and thought the pain would stop, as pain increased, employee reported the injury.
SLIP OR FALL OF PERSON · DAYS AWAY FROM WORK ONLY
Accident narrative
While climbing a pipe crossover, the individual's hands slipped from the handrail, causing a fall to the ground where they impacted their shoulder and elbow.
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.
Freeport-McMoRan InccontrolsFreeport-McMoRan Sierrita Ops.operatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144Phelps Dodge CorpcontrolsFreeport-McMoRan Sierrita Ops.operatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144Cyprus Amax Minerals CompanycontrolsCyprus Sierrita CorpoperatesFreeport-McMoRan Sierrita Ops.
msha-controller-operator-history · controller/operator co-tenure derived on mine 0200144Pennzoil 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.
Accidents and injuries
797 historical accident/injury rows; 0 coded fatalities and 10,412 lost days across the published record.
accidentsmine-production-quarterlyViolations 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.
inspectionsviolationsassessed-violationsorders-107aOccupational 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.
personal-health-samplesarea-samplesQuarterly production and employment
687K employee hours and 1,326 summed average employees across reported subunits in the latest published quarter.
mine-production-quarterlymine-production-yearlyContests, conferences and decisions
370 contested-violation rows, 377 civil-penalty docket/decision rows, and 36 conference records linked by issuance number.
conferencescontested-violationscivil-penalty-dockets-decisionsContractors
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.
contractor-production-quarterlycontractor-production-yearlyaccidentsviolationsInspections
228 inspection events and 18K published inspection hours across the historical record.
inspectionsviolationsHEALTH SAMPLING
Silica and quartz
Coal quartz, metal/nonmetal personal samples and area samples. Snapshot Oct 18, 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.
This can mean the operation is non-coal, inactive for the annual period, or outside the EIA-7A reporting population.
RECENT PUBLIC RECORDS
Recent violations and samples
Latest records retained for inspection; aggregates above use the full source history.
Coal dust, noise and other contaminants. Silica records above ↑
SOURCE COVERAGE
Reporting dates and coverage
16 datasets contain linked records. Missing datasets are listed below.
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.