Total reported releases
Total reported releases at Montana Resources LLC have risen 68% since 2010 (through 2024).
TRI facility · TRI 2024 reporting year
Montana Resources LLC
Total reported releases 31.7M lb fell meaningfully year over year (-21%). Total releases concentrations are up 68% since 2010.
600 SHIELDS AVE, Butte, Montana · 212230 · Metal Mining
Anomaly engine
Notable Signals
Cadmium compounds
Cadmium compounds releases at Montana Resources LLC fell from 31k lb to 2k lb (94% lower) between 2023 and 2024.
Chemicals reported · most recent year
What This Facility Releases
Manganese And Manganese Compounds
Manganese And Manganese Compounds concentrations are up 60% since 2016.
Copper And Copper Compounds
Copper And Copper Compounds concentrations are roughly unchanged from 2010.
Zinc compounds
Zinc compounds concentrations are up 49% since 2010.
Lead compounds
Lead compounds concentrations have fallen 23% since 2010.
Chromium
Chromium concentrations have fallen 29% since 2010.
Cobalt compounds
Cobalt compounds concentrations have fallen 24% since 2020.
Nitrate compounds (water dissociable; reportable only when in aqueous solution)
Nitrate compounds (water dissociable; reportable only when in aqueous solution) concentrations have fallen 29% since 2016.
Nickel And Nickel Compounds
Nickel And Nickel Compounds concentrations have fallen 39% since 2019.
Equity context · ACS 2018-2022 block-group demographics
Who Lives Next To This Facility
Within 3 miles of this facility (30 Census block groups, population-weighted demographics): a population of 26,605. Why we surface this →
38.9%
Low-income
11.6%
People of color
5.7%
Under age 5
19.6%
Over age 64
Source: Census ACS 2018-2022 block-group demographics, population-weighted across the 3-mile buffer around this facility (from USEPA-clone/EJAM-open blockgroupstats). Indicator-level percentile and EJ-disparity scores are surfaced on the county page and the state page — they describe wider regional exposure burdens, not effects attributable to a single facility.
Source. EPA Toxics Release Inventory · retrieved 2026-05-07. Reporting year 2024. TRI is a federal public-domain dataset under 17 USC §105.
What this is not. TRI quantifies releases reported by the facility under EPCRA §313 — not ambient air or water concentrations measured at receptors. We do not attribute individual health outcomes to specific facilities; that exceeds what the data can support.