Coal production
0reported short tons
ALL STATUSES / OPERATOR PORTFOLIO
Freeport-McMoRan Sierrita Ops.
Membership and operating status are from the latest MSHA Mines snapshot. Open a mine for its ownership history.
MSHA OPERATOR IDL17248
MINE PORTFOLIO
2 of 2 mines and facilities
2025-01-01 – 2026-10-18. All statuses records; production reporting is not required.
Material, method and type filters apply to this table. The portfolio’s status applies to the entire page. GEM fields describe their own release, not the selected MSHA year.
| Mine | Location / type | Coal · short tons | Hours worked | Violations | Accident records | On-site inspection hours |
|---|---|---|---|---|---|---|
| Freeport-McMoRan Sierrita Ops.0200144 · Active6/8 quarters reported | Pima, AZSurface · MSHA: Copper Ore NEC | 0 | 4,067,210 | 155 | 60 | 707.0 |
| Twin Buttes Mine0203262 · Abandoned | Pima, AZSurface · MSHA: Copper Ore NEC | — | — | 0 | 0 | — |
Production and hours sum available quarterly reports. — means unavailable; zero safety records means none in the selected imported period. Ownership reflects the current MSHA record.
LOCATION
Portfolio map
2 of 2 mines with usable MSHA coordinates. Select a marker to open a mine.
Mine coordinates
- Freeport-McMoRan Sierrita Ops.31.87583, -111.10111Open map ↗
- Twin Buttes Mine31.87250, -111.08805Open map ↗
Quarterly trends
2025 Q1 – 2026 Q4
Database snapshot · 2026-10-18. All 2 mines listed under this operator were checked; 1 have reports in the available quarters. Totals use current ownership.
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
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
Impoundment Spot Inspection · 3.0 on-site hours
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
56.14100(b) · S&S · $818.00 proposed
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
Spot Inspection · 0.0 on-site hours
- Freeport-McMoRan Sierrita Ops. · 0200144
50.20-1 · $151.00 proposed
- Freeport-McMoRan Sierrita Ops. · 0200144
50.20-1 · $151.00 proposed
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
FALLING/SLIDING/ROLLING MATERIALS · DAYS RESTRICTED ACTIVITY ONLY
Accident narrative
clock fell off the wall striking employee in the left arm
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
Impoundment Spot Inspection · 3.5 on-site hours
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
Spot Inspection · 1.0 on-site hours
- Freeport-McMoRan Sierrita Ops. · 0200144
50.10(d) · $193.00 proposed
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
- Freeport-McMoRan Sierrita Ops. · 0200144
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.
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.
SELECTED PORTFOLIO
1 linked controller.
Relationships reflect the selected mine status and current MSHA controller/operator fields.