EPA TRI Facility · Metal Mining
Stillwater Mining Co East Boulder Mine
Big Timber, MT
- Total releases
- 2.0M lbs
- Chemicals reported
- 14
- Carcinogens
- 3
- Primary pathway
- Land Disposal
LAND Form-R mix
Stillwater Mining Co East Boulder Mine: how the 2.0M lbs splits
2.0M lbs across all reported pathways
- Land Disposal 2.0M lbs 99.7%
- Air Releases 5.1K lbs 0.3%
Stillwater Mining Co East Boulder Mine's 2.0M lbs Form-R total is LAND - land disposal is 99.7% of the bar. Next segment: air releases at 0.3%. Leading chemical by pounds: Nickel compounds.
Carcinogen-classified pounds vs other reported pounds
Same cumulative TRI total as above, split by EPA/IARC carcinogen classification on each chemical: pounds share, not chemical count. Classification is not a site health-risk score.
HEAVY volume LAND pathway CARC-HEAVY
Stillwater Mining Co East Boulder Mine is an EPA Toxics Release Inventory reporter in Big Timber, MT, in the metal mining sector. It reported 409.5K lbs of releases across 8 chemicals in 2023, and 2.0M lbs in total across its 2019-2023 reporting years. That ranks 869 of 25,986 TRI facilities nationwide by cumulative reported pounds, counting each facility over however many years it has filed. In Montana's 67 reporting TRI sites, pounds #1 is not chemical-count #1. Stillwater Mining Co East Boulder Mine is pounds #4 and chemical-count #10 at 2.0M lbs. Montana Resources LLC leads reported pounds (215.2M lbs) at 12 chemicals (chemical-count #11). Phillips 66 Co Billings Refinery leads chemical count at 39 chemicals (465.0K lbs, pounds #16). Reported volume rose against 2022. Pounds reported are not a measure of toxicity or health risk. Nearest other TRI reporters: Smc Nye Mine Site; Montana Silversmiths; Smc Precious Metals Smelter & Base Metals Refinery; Darigold-Bozeman. Similar-scale Metal Mining peers outside Montana: Fiore Gold Pan Mine; Freeport-McMoran Tyrone Inc.; Missouri Cobalt; Eagle Mine. Largest disclosed chemicals by pounds: Nickel compounds; Nickel And Nickel Compounds; Methanol; Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region).
Stillwater Mining Co East Boulder Mine stamps HEAVY volume with a dominant LAND pathway (99.7% land disposal) across 14 chemicals · 3 carcinogen-classified. Cumulative Form-R extract: 2.0M lbs (2019–2023). All figures are self-reported EPCRA §313 estimates, not measured stack emissions or a health-risk score. Scale peers include Fiore Gold Pan Mine and Freeport-McMoran Tyrone Inc..
Stillwater Mining Co East Boulder Mine vs. every reporting TRI facility
Cumulative reported release pounds, with this facility marked in the national distribution
2.0M lbs Top 3% higher than 97% of 25,986 reporting TRI facilities
Each bar is a $1M-wide band; taller bars hold more reporting TRI facilities. The dashed line and filled bar mark this facility. Hover, focus, or tap a bar for its full count, share, and position.
Source U.S. Environmental Protection Agency, Toxics Release Inventory · 2023 reporting year
Stillwater Mining Co East Boulder Mine inside Sweet Grass's TRI pounds
Among the 103 Metal Mining facilities in this database, Stillwater Mining Co East Boulder Mine reports the 54th-largest volume (2.0M lbs). This one site accounts for 100% of every pound reported in Sweet Grass. Carcinogen-classified chemicals make up 58.0% of the reported pounds, not just of the chemical count. Scale peers outside Montana include Fiore Gold Pan Mine and Freeport-McMoran Tyrone Inc..
County-dominant here means ≥25% of Sweet Grass's reported pounds (2.0M lbs county total). Shares only print when the site reports ≥1,000 lbs.
Annual disclosure change
What changed: EPA TRI 2023 reporting year
- Stillwater Mining Co East Boulder Mine's total reported releases rose from 285.5 thousand lb in 2022 to 409.5 thousand lb in 2023, based on EPA TRI filings.
- Stillwater Mining Co East Boulder Mine's land releases rose from 283.3 thousand lb in 2022 to 407.1 thousand lb in 2023, based on EPA TRI filings.
- Stillwater Mining Co East Boulder Mine's chemicals reported fell from 9 in 2022 to 8 in 2023, based on EPA TRI filings.
- Stillwater Mining Co East Boulder Mine's air releases rose from 2.3 thousand lb in 2022 to 2.3 thousand lb in 2023, based on EPA TRI filings.
Stillwater Mining Co East Boulder Mine Form-R facts
Compare this facility
See how Stillwater Mining Co East Boulder Mine stacks up against nearby facilities and the typical reporter.
42% less than the comparison
About the same as the comparison
Comparison reflects reported pounds and chemical counts, not toxicity or health risk. Averages cover facilities reporting any release.
How does this facility release toxic chemicals?
How Stillwater Mining Co East Boulder Mine releases toxic chemicals into the environment. Total: 2.0M lbs.
Emissions Trend Summary
From 2019 to 2023, total releases held roughly flat (410.7K lbs to 409.5K lbs).
Stillwater Mining Co East Boulder Mine: annual Form-R pounds
HEAVY site · LAND pathway · TRI years 2019–2023
- 2019 0
- 2020 0
- 2021 0
- 2022 0
- 2023 0
What this shows Stillwater Mining Co East Boulder Mine year-over-year reported totals (held roughly flat from 2019 to 2023). TRI figures are self-reported estimates and can swing with production, waste handling, and reporting changes, not only with controls. Lead chemical in the extract: Nickel compounds.
| Year | Total | Chemicals |
|---|---|---|
| 2019 | 410.7K lbs | 8 |
| 2020 | 416.8K lbs | 8 |
| 2021 | 447.5K lbs | 6 |
| 2022 | 285.5K lbs | 9 |
| 2023 | 409.5K lbs | 8 |
Chemical Releases
Aggregated across all reporting years (2019–2023). 3 of 14 chemicals are carcinogens. Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Nickel compounds | 696.2K lbs | Carcinogen |
| Nickel And Nickel Compounds | 446.1K lbs | Carcinogen |
| Methanol | 297.4K lbs | - |
| Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region) | 268.1K lbs | - |
| Copper And Copper Compounds | 113.7K lbs | - |
| Copper compounds | 86.5K lbs | - |
| Chromium compounds (except for chromite ore mined in the Transvaal Region) | 48.0K lbs | - |
| Lead And Lead Compounds | 4.4K lbs | - |
| Propylene | 4.2K lbs | - |
| Lead compounds | 2.7K lbs | - |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 2.5K lbs | - |
| Mercury And Mercury Compounds | 50 lbs | - |
| Mercury compounds | 45 lbs | - |
| Styrene | 0 lbs | Carcinogen |
Stillwater Mining Co East Boulder Mine · LAND-pathway site
Nearest TRI Facilities to Stillwater Mining Co East Boulder Mine
Closest other reporters in Montana - including Smc Nye Mine Site, Montana Silversmiths, Smc Precious Metals Smelter & Base Metals Refinery, ordered by distance.
Showing 8 of 66 other reporting facilities in Montana.
Similar Metal Mining Facilities
Other Metal Mining facilities with similar total release volumes (±80%), outside Montana - e.g. Fiore Gold Pan Mine, Freeport-McMoran Tyrone Inc., Missouri Cobalt.
Compare beyond Montana
Nationwide peers by reported pounds & chemical count
Cross-state TRI reporters nearest Stillwater Mining Co East Boulder Mine on cumulative reported pounds (2.0M lbs) and distinct chemical count (14). Release-pound peers include The Lincoln Electric Co, Optima Chemical Group LLC, Winyah Generating Station. Chemical-count peers include Shell New Haven Terminal, Chambers Cogeneration L.P., Avantor Performance Materials. Neighborhoods are forced disjoint so each axis surfaces a different set of sites.
Similar reported release pounds
Nearest out-of-state reporters (≥1,000 lbs) by absolute TRI pounds, not same-industry or same-county neighbors.
Similar chemical count
Nearest out-of-state reporters by distinct Form-R chemicals (deduped against the release-pound neighborhood).
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
On this page the largest disclosed chemicals include Nickel compounds, Nickel And Nickel Compounds, Methanol, Chromium and Chromium Compounds(except for chromite ore mined in the Transvaal Region); nearby reporters include Smc Nye Mine Site. Stillwater Mining Co East Boulder Mine stamps HEAVY volume · LAND pathway · CARC-HEAVY carcinogen-lbs on this Form-R extract. Totals are self-reported estimates under EPCRA §313, not measured stack emissions or a health-risk score.
Use and verify this record
This Stillwater Mining Co East Boulder Mine TRI extract (HEAVY · LAND · CARC-HEAVY · lead Nickel compounds) joins EPA Form-R filings with facility identity - reported pounds, not a health-risk rating.
Stillwater Mining Co East Boulder Mine totals are self-reported EPCRA §313 estimates for Big Timber, MT, latest year 2023. Form-R rows span 2019–2023 (5 years). NAICS 212299 · Metal Mining. 100% of Sweet Grass TRI pounds in this extract. Nearest ABS peer: The Lincoln Electric Co (Δ 954 lbs). Pounds ≠ exposure.
Stillwater Mining Co East Boulder Mine stamps HEAVY volume · LAND pathway · CARC-HEAVY · lead Nickel compounds. PlainEnviro renders this EPA Form-R extract from its pipeline; no figure is typed in by an editor. Corrections: editorial policy.
All federal data sources used on this page
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program reference - how chemicals and reported releases are counted. epa.gov
- EPA Facility Registry Service - facility location and identity. epa.gov
- EPA ECHO - regulatory and compliance context. epa.gov
- EPA Envirofacts - the EPA data warehouse exposing these datasets. epa.gov