4D twin · seismic-tied
Stillwater / East Boulder
Sibanye-Stillwater · Stillwater / Sweet Grass County, MT · site LTH-STILLWATER-MT
Loading twin…
1599 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 |
|---|---|---|---|---|---|
| J-M Reef | J-M reef 3D | 3D reflection | 2007 | Ties the shell | 4800–7200 |
| J-M Reef | East Boulder VSP | VSP / borehole | 2015 | Ties the shell | 5000–7300 |
PhD geological read
User-initiated. Grounded in MCS 2026, the mapped ore shells, and the seismic crosswalk. Not a reserve.
Layered mafic-ultramafic Stillwater Complex. J-M Reef ~1–3 m thick, high Pd:Pt.
Capacity
Workforce1,600
Nameplate16 tpy
Utilization80%
Effective13 tpy
t / person-year0
Landform is site-typed: porphyry pit, block cave, underground vein/reef, Carlin, gravel, quarry. Seismic fences are Vp-banded.