Facility Info
364
Mountain Pass Mine
10/17/07 Rec'd a change of owner applications for all the permits currently under Union Oil Molycorp. The change is going from Union Oil Molycorp to Chevron Mining, Inc. The company/facility numbers will be staying the same. (005/0364) Barbara Weese
08-08-2017 Moved Companies From Molycorp Minerals, LLC(5) to MP Mine Operations LLC(2349)
| Permit Number | Permit Description | Equipment Description | Issue Date | Expiration Date | Action | |
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| B001941 | LEACH/CCD CIRCUIT - LANTHANIDES PROCESS | N/A | 02/10/2026 | 02/28/2027 |
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| B001947 | LANTHANUM PRECIPITATION PROCESS | N/A | 02/10/2026 | 02/28/2027 |
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| B002167 | PRODUCT DRYER - CERIUM CARBONATE | N/A | 02/15/2011 | 02/29/2012 |
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| B002168 | PACKAGING - CERIUM CARBONATE | a 4 hp Product Packaging Machine; dry product s... | 02/15/2011 | 02/29/2012 |
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| B002169 | LEACH CIRCUIT - CERIUM CARBONATE | N/A | 02/10/2026 | 02/28/2027 |
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| B002170 | CERIUM 96 PLANT - LEAD/IRON REMOVAL CIRCUIT | N/A | 02/10/2026 | 02/28/2027 |
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| B002171 | NEUTRALIZATION SCRUBBER SOLUTION CIRCUIT | N/A | 02/10/2026 | 02/28/2027 |
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| B002173 | CERIUM CARBONATE CIRCUIT | N/A | 02/10/2026 | 02/28/2027 |
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| B002371 | SOLVENT EXTRACTION,- CIRCUIT No. 4 | N/A | 02/13/2012 | 02/28/2013 |
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| B002372 | SPECIALTY PLANT FEED PREPARATION CIRCUIT | N/A | 02/10/2026 | 02/28/2027 |
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| B002373 | SOLVENT EXTRACTION CIRCUIT - SX 3/6 | N/A | 02/10/2026 | 02/28/2027 |
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| B002374 | SOLVENT EXTRACTION - CERIUM SPECIALTY PLANT (SX-... | N/A | 02/13/2012 | 02/28/2013 |
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| B002827 | SODA ASH TREATMENT SYSTEM | N/A | 02/15/2011 | 02/29/2012 |
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| B002828 | ROUGHER FLOATATION SYSTEM | N/A | 02/15/2011 | 02/29/2012 |
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| B002831 | PACKAGING SYSTEM FOR CERIUM CIRCUIT NO. 2 | N/A | 08/08/2017 | 02/28/2018 |
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| B002832 | PACKAGING MACHINE FOR No. 1 LANTHANUM DRYER SYST... | N/A | 02/15/2011 | 02/29/2012 |
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| B003259 | DRYER - CHEMICAL PLANT RIBBON BLENDER | a electrical dryer, which is 4 ft in diameter by... | 02/13/2012 | 02/28/2013 |
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| B003265 | FLAKE LANTHANUM PROCESS | N/A | 02/13/2012 | 02/28/2013 |
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| B004027 | FURNACE #3: YTTRIUM/EUROPIUM CO-PRECIP | a Mine and Smelter Company unit with Nichrome he... | 02/15/2011 | 02/29/2012 |
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| B004921 | CERIUM REDOX CIRCUIT | Oxidation with sodium hypochlorite solution, pH... | 02/10/2026 | 02/28/2027 |
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| B004371 | PURIFICATION PROCESS - EUROPIUM | N/A | 02/10/2026 | 02/28/2027 |
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| B004028 | PACKAGING - YTTRIUM PROCESS | 80 cu ft Blender, 30 hp No. 2 Product Screw, 3 ... | 02/15/2011 | 02/29/2012 |
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| B004030 | PACKAGING - YTTRIUM, CO-PRECIPITATION | 80 cu ft Blender @ 20 hp No. 2 Product Screw @ ... | 02/15/2011 | 02/29/2012 |
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| B004087 | NEO CARB/NEO CARB FLUORIDE CIRCUIT | N/A | 02/13/2012 | 02/28/2013 |
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| B004033 | CERIUM SLURRY MAKE-UP PROCESS | Cerium Slurry Make-up Hopper Cerium Slurry Make... | 02/15/2011 | 02/29/2012 |
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