Facility profile
Molycorpmolycorp Mountain Pass Mine
Violation Identified across 4 of the last 12 quarters, with $19,964 in recorded penalties.
Noncompliance quarters
4
Counted from the imported ECHO record over the last 12 quarters.
Penalties
$19,964
Recorded enforcement amount carried into the facility page.
Last inspection
2025-06-23
Displayed as plain language instead of hidden in agency exports.
Trend
Watch
Reported on-site releases are higher in 2024 than in 2023.
| Year | Air | Water | Land | Total |
|---|---|---|---|---|
| 2023 | 14,231 lbs | 1 lbs | 1,383,829 lbs | 1,398,061 lbs |
| 2024 | 17,411 lbs | 1 lbs | 1,600,106 lbs | 1,617,518 lbs |
Chemical breakdown
What this facility is reporting
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Lead compounds
Latest 2024 TRI data shows land as the largest reported pathway for this chemical at the facility.
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Ammonia
Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.
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Propylene
Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.
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Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size)
Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.
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Chlorine
Latest 2024 TRI data shows air as the largest reported pathway for this chemical at the facility.
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Mercury compounds
Latest 2024 TRI data shows land as the largest reported pathway for this chemical at the facility.
Enforcement layer
Why the ECHO-style detail matters
Violation Identified across 4 of the last 12 quarters, with $19,964 in recorded penalties.