Year-over-year total releases
Reported on-site TRI releases in pounds (lbs), grouped by reporting year.
Facility detail
MP MINE OPERATIONS LLC
67750 BAILEY RD, MOUNTAIN PASS, CA, 92366
Parent company: NA
PBT
— EPA classifications across all reporting years
Top chemical totals
The 10 chemicals with the highest cumulative on-site releases in pounds (lbs) across all available years.
Full release table
Rows are years. Columns show the five highest-total chemicals across all years plus each year's total release volume.
| All values in pounds (lbs) | ||||||
|---|---|---|---|---|---|---|
| Year | Ammonium nitrate (solution) | Lead And Lead Compounds | Lead compounds | Ammonia | Chlorine | Total (lbs) |
| 2024 | — | 1,600,418 | — | 11,373 | 607 | 1,617,518 |
| 2023 | — | 1,384,319 | — | 7,184 | 2,137 | 1,398,061 |
| 2015 | — | — | 70 | — | 1,013 | 13,541 |
| 2014 | — | — | 149 | — | 991 | 16,294 |
| 2013 | — | — | 14 | — | 3,100 | 16,115 |
| 2012 | — | — | 207 | — | 17,000 | 17,207 |
| 2011 | — | — | 17 | — | 14,000 | 40,997 |
| 2010 | — | — | 138 | — | 855 | 992 |
| 2009 | — | — | 122 | — | — | 122 |
| 2008 | — | — | 202 | — | — | 202 |
| 2007 | — | — | 227 | — | — | 227 |
| 2006 | — | — | 245 | — | — | 245 |
| 2005 | — | — | 281 | — | — | 281 |
| 2004 | — | — | 280 | — | — | 280 |
| 2003 | — | — | 383 | — | — | 383 |
| 2002 | — | — | 32,936 | — | — | 32,936 |
| 2001 | — | — | 27,361 | — | — | 27,361 |
| 2000 | — | — | — | — | — | 8 |
| 1999 | — | — | 223,306 | — | — | 223,306 |
| 1998 | — | — | 1,367,454 | — | 1,432 | 1,686,559 |
| 1995 | — | — | — | 811,526 | 26,007 | 2,082,112 |
| 1994 | 506,976 | — | 7,442 | 28,291 | 12,474 | 601,317 |
| 1993 | 599,028 | — | 57,858 | 98,441 | 15,936 | 779,506 |
| 1992 | 682,089 | — | 22,970 | 172,151 | 32,214 | 1,019,637 |
| 1991 | 5,764,976 | — | 74,647 | 151,727 | 304,415 | 6,388,368 |
| 1990 | 2,300,000 | — | 63,000 | 182,000 | 352,000 | 2,987,870 |
| 1989 | 2,700,000 | — | 50,000 | 171,000 | 550,000 | 3,577,700 |
| 1988 | — | — | 54,653 | 110,000 | — | 214,103 |
| 1987 | — | — | — | — | — | 34,383 |
▎ Facilities report to EPA's TRI once they manufacture, process, or use a listed chemical above set thresholds. Once that threshold is crossed, they must report actual releases regardless of size — so a small number reflects genuine low-level discharge, not a data error.