EPA TRI Facility · Metal Mining
Mp Mine Operations LLC
Mountain Pass, CA
- Total releases
- 1.4M lbs
- Chemicals reported
- 6
- Latest report
- 2023
- Primary pathway
- Land Disposal
Mp Mine Operations LLC has reported 1.4M lbs of toxic releases across 6 chemicals to the EPA Toxic Release Inventory, based on annual facility disclosures from 2019 through 2023. The facility operates in the Metal Mining sector. The primary release pathway is land disposal, accounting for 99% of total releases. All release data shown below is self-reported to the EPA under the Emergency Planning and Community Right-to-Know Act (EPCRA) Section 313.
Mp Mine Operations LLC files annual Form R disclosures to the EPA Toxics Release Inventory under EPCRA Section 313, classified under NAICS 212290 (Metal Mining). Across 1 year of records spanning 2023–2023, the site has disclosed 1.4M lbs in cumulative toxic releases across 6 distinct chemicals.
The dominant release pathway is land disposal at 1.4M lbs (99.0% of total volume), followed by air releases at 1.0%.
TRI Form R values are self-reported estimates, not measured stack emissions, and treat every pound of reported chemical equally regardless of toxicity. Inclusion in the TRI database does not establish a health risk to nearby residents; it documents the annual reporting record that Mp Mine Operations LLC has filed with the EPA under federal community right-to-know requirements.
Quick Facts
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87% less than 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 Mp Mine Operations LLC releases toxic chemicals into the environment. Total: 1.4M lbs.
Chemical Releases
Aggregated across all reporting years (2023–2023). Sorted by total release volume.
| Chemical | Total | Flags |
|---|---|---|
| Lead And Lead Compounds | 1.4M lbs | - |
| Ammonia | 7.2K lbs | - |
| Propylene | 2.2K lbs | - |
| Chlorine | 2.1K lbs | - |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 1.8K lbs | - |
| Mercury And Mercury Compounds | 471 lbs | - |
Location
Other Facilities in California
About TRI Data
Data as of 2023 reporting year. Source: U.S. Environmental Protection Agency (EPA) Toxic Release Inventory.
Data comes from the EPA Toxic Release Inventory (TRI) program. Facilities that manufacture, process, or otherwise use listed toxic chemicals above threshold amounts are required to report annually to the EPA.
Release quantities are self-reported by the facility and may represent estimates rather than exact measurements. "Total releases" includes releases to air, water, land, and off-site transfers for disposal. Quantities shown here are aggregated across all available reporting years.
PlainEnviro presents this data without advocacy framing. The presence of a facility in the TRI database does not by itself indicate a health risk. For site-specific health questions, consult your local environmental or health agency.
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Explore More Data for California
What to do with this facility's data
Use this facility profile as a starting point, then check how it compares.
- This facility ranks #1,070 of 25,902 TRI facilities nationwide by total reported releases - among the top 4.1% of reporting sites by volume. Ranking reflects reported pounds, not toxicity or health risk. See the full rankings
- Check California's statewide profile for the full picture: total facilities, water systems, and Superfund sites. View California profile
TRI release totals are self-reported estimates submitted to the EPA, not independently measured stack emissions; a high rank reflects reported volume, not necessarily local health risk.
Read our methodology - how this data is sourced, computed, and verified.
Related
Sources & how this page was built
Every figure on this page traces to public, federal-government data on Mp Mine Operations LLC. The records below are the primary sources; our methodology explains how they are joined, computed, and verified.
- EPA Toxics Release Inventory (TRI) Basic Data Files - annual self-reported chemical-release filings. epa.gov
- EPA TRI Program, chemical & reporting reference - what each chemical is and how releases are counted. epa.gov
- EPA Facility Registry Service (FRS) - authoritative facility location and identity. epa.gov
- EPA Enforcement & Compliance History Online (ECHO) - regulatory and compliance context. echo.epa.gov
- EPA Envirofacts - the EPA data warehouse that exposes these datasets. enviro.epa.gov
Retrieved and formatted by PlainEnviro Editorial. TRI release totals are self-reported estimates, not measured stack emissions.
According to the U.S. Environmental Protection Agency, the Toxics Release Inventory has required annual industrial disclosure since its creation under the Emergency Planning and Community Right-to-Know Act in October 1986, and this facility's record is drawn from PlainEnviro's database of more than 25,000 EPA-tracked facilities through the 2023 reporting year; see our methodology for full source citations and refresh cadence.