4D twin · seismic-tied
Sierrita
Freeport-McMoRan · Pima County, AZ · site LTH-SIERRITA-AZ
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1182 m NAVD88 · Vp low —— high
Ore–seismic crosswalk
Each shell is tied to the survey that would image it. Desk compilation from published USGS / industry methods — not the operator’s confidential cube. Not a reserve.
| Ore shell | Survey | Method | Year | Tie | Vp m/s |
|---|
PhD geological read
User-initiated. Grounded in MCS 2026, the mapped ore shells, and the seismic crosswalk. Not a reserve.
Twin pits (Sierrita-Esperanza) in a large low-grade porphyry with significant Mo-Re credits.
Capacity
Workforce1,400
Nameplate85,000 tpy
Utilization78%
Effective66,300 tpy
t / person-year61
Landform is site-typed: porphyry pit, block cave, underground vein/reef, Carlin, gravel, quarry. Seismic fences are Vp-banded.