Stillwater Mining Co
2 facilities · 1 state · 3.4M lbs total releases
According to the EPA Toxics Release Inventory, Stillwater Mining Co is the reported parent of 2 Form R facilities across 1 state, disclosing 3.4M lbs of toxic releases. 5 of 30 reported chemicals carry a carcinogen classification in the TRI extract. The heaviest-reporting state by release volume is Montana (3.4M lbs). Those TRI figures remain self-reported disclosure pounds for Stillwater Mining Co, including carcinogen-flagged substances, not a measured public-health risk score.
Release-over-release change
What changed for Stillwater Mining Co: EPA TRI 2023 reporting year
Same facilities, both years
+26.6%
2 facilities that filed in 2022 and 2023
Whole inventory
+26.6%
573.1 thousand lb → 725.3 thousand lb, every facility that filed
- Stillwater Mining Co's total reported releases rose from 573.1 thousand lb in 2022 to 725.3 thousand lb in 2023, based on EPA TRI filings.
- Stillwater Mining Co's land releases rose from 122.7 thousand lb in 2022 to 159.0 thousand lb in 2023, based on EPA TRI filings.
- Stillwater Mining Co's off-site transfers rose from 448.4 thousand lb in 2022 to 564.3 thousand lb in 2023, based on EPA TRI filings.
- Stillwater Mining Co's chemicals reported rose from 15 in 2022 to 17 in 2023, based on EPA TRI filings.
TRI parent disclosure trail
Read Stillwater Mining Co from filing to facility
Largest Form R sites under this parent: Smc Nye Mine Site; Smc Precious Metals Smelter & Base Metals Refinery. Neighbor parents on the disclosure ladder: Par Pacific Holdings Inc; Weyerhaeuser Co. Largest disclosed chemicals by pounds: Nickel And Nickel Compounds; Methanol; Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region); Chromium compounds (except for chromite ore mined in the Transvaal Region); Nickel compounds. Heaviest-reporting states in this extract: Montana. Industry labels on the parent rollup: Metal Mining; Primary Metals. Start from those named sites and neighbors rather than a generic parent blurb; pounds stay disclosure, not risk.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files Toxics Release Inventory (TRI) · August 2026
Largest Form R sites under this parent: Smc Nye Mine Site; Smc Precious Metals Smelter & Base Metals Refinery. Neighbor parents on the disclosure ladder: Par Pacific Holdings Inc; Weyerhaeuser Co. Largest disclosed chemicals by pounds: Nickel And Nickel Compounds; Methanol; Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region); Chromium compounds (except for chromite ore mined in the Transvaal Region); Nickel compounds. Heaviest-reporting states in this extract: Montana. Industry labels on the parent rollup: Metal Mining; Primary Metals.
Stillwater Mining Co ranks #340 of 4,988 slug-merged TRI parents, a smaller disclosed-volume parent relative to the national Form R parent set. Stillwater Mining Co's TRI Form R footprint is concentrated in a single state (Montana), so statewide context matters more than a multi-state portfolio read. Releases are facility-concentrated: Smc Nye Mine Site accounts for most of Stillwater Mining Co's disclosed pounds, so peer comparisons should weight that site, not an even portfolio average.
Parent aggregation for Stillwater Mining Co follows facility-reported names. Compare the named neighbors (Par Pacific Holdings Inc; Weyerhaeuser Co) before treating rank as a hazard score; TRI stays self-reported and unweighted by toxicity.
Where Stillwater Mining Co sits among TRI parents
Stillwater Mining Co sits on a disclosure ladder beside Par Pacific Holdings Inc and Weyerhaeuser Co. Open those parents for a different facility count, state span, and chemical mix.
Lower disclosed volume
- Par Pacific Holdings Inc · rank #341 · 881.7K lbs
- Weyerhaeuser Co · rank #342 · 866.1K lbs
Largest chemicals disclosed by Stillwater Mining Co
Nickel And Nickel Compounds; Methanol; Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region); Chromium compounds (except for chromite ore mined in the Transvaal Region); Nickel compounds lead the Form R pound rollup for this parent, including filings such as Smc Nye Mine Site. Pound totals, not toxicity-weighted risk.
| Chemical | Disclosed lbs |
|---|---|
| Nickel And Nickel Compounds | 1.0M lbs |
| Methanol | 958.0K lbs |
| Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 414.4K lbs |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 314.8K lbs |
| Nickel compounds | 260.9K lbs |
Facilities (2)
| Facility | Releases |
|---|---|
| Smc Nye Mine Site Nye, MT | 3.4M lbs |
| Smc Precious Metals Smelter & Base Metals Refinery Columbus, MT | 3.1K lbs |
Frequently Asked Questions
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Compare beyond the release ladder
Nationwide peers by disclosed pounds & facility count
Cross-portfolio TRI parents nearest Stillwater Mining Co on total disclosed release pounds (3.4M lbs) and reporting facility count (2). Release-volume peers include The Sherwin-Williams Co, Shell Petroleum Inc, Albemarle Corp. Neighborhoods are forced disjoint so each axis surfaces a different set of parents.
Similar disclosed release pounds
Nearest parents (≥3 facilities, ≥10k lbs) by absolute TRI disclosed pounds, not rank-adjacent ladder neighbors.
About This Data
EPA TRI parent totals cover all media. This extract's heaviest states for the parent are Montana; facility-reported names can vary across subsidiaries.
Source: U.S. Environmental Protection Agency, TRI Basic Data Files
What to do with Stillwater Mining Co's TRI parent record
From Stillwater Mining Co, open Smc Nye Mine Site or compare against Par Pacific Holdings Inc rather than reading rank alone.
- Open the largest Form R site for Stillwater Mining Co (Smc Nye Mine Site in MT). Largest facility
- Compare against Par Pacific Holdings Inc, the next-lower disclosed-volume parent. Lower-volume parent
- Browse the full parent release ranking to see where Stillwater Mining Co sits among all slug-merged TRI parents. All parent companies
Rank and peers (Par Pacific Holdings Inc, Weyerhaeuser Co) are disclosure volume only, not toxicity-weighted risk or enforcement status.
Use and verify this record
Stillwater Mining Co's record groups disclosed TRI parent-company filings so readers can compare reporting context without treating the total as a measure of risk.
Company release figures are computed directly from EPA Toxic Release Inventory data; source names and the record-linking method are documented in the methodology.
Primary sources
- EPA Toxics Release Inventory Basic Data Files - annual facility-level chemical-release disclosures
PlainEnviro renders public EPA records directly from its data pipeline; no figure on this page is typed in by an editor. See the editorial standards and corrections policy for how source changes and reported errors are handled.