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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| E007792 | DIESEL IC ENGINE, EMERGENCY GENERATOR | Year of Manufacture: Unknown | 02/10/2026 | 02/28/2027 |
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| E010118 | DIESEL IC ENGINE, EMERGENCY GENERATOR (GND-2) | Yr of Mfg1987, Tier 0 | 03/12/2013 | 02/28/2014 |
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| B000372 | RARE EARTH ROASTER/LEACH FEED CIRCUIT | N/A | 02/10/2026 | 02/28/2027 |
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| B000375 | CEMENT AND AGGREGATE LOADOUT SYSTEM | N/A | 03/12/2013 | 02/28/2014 |
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| B000377 | CERIUM CIRCUIT No. 2 PACKAGING SYSTEM AT CHEMICA... | N/A | 08/08/2017 | 02/28/2018 |
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| B000379 | CERIUM CIRCUIT No. 2 - DRYER SYSTEM | N/A | 08/08/2017 | 02/28/2018 |
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| B000382 | BOILER | a Babcock and Wilcox type FM, Integral Furnace, ... | 02/15/2011 | 02/29/2012 |
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| B000383 | ROTARY KILN DRYER No. 1 LANTHANUM | N/A | 02/15/2011 | 02/29/2012 |
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| B000385 | ROTARY KILN DRYER - No. 2 LANTHANUM | N/A | 02/10/2026 | 02/28/2027 |
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| B000698 | FURNACE #1: YTTRIUM/EUROPIUM CO-PRECIP | N/A | 02/10/2026 | 02/28/2027 |
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| B000699 | FURNACE #2: YTTRIUM OXIDE | N/A | 02/15/2011 | 02/29/2012 |
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| B000821 | PACKAGING SYSTEM - No. 1 CONCENTRATE (AT FLOATAT... | N/A | 03/01/2004 | 02/28/2005 |
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| B000822 | GRINDING MILL FEED No. 1 | FP-09 Conditioners, 3 @ 1500 gal and 15 hp each... | 12/30/1998 | 02/28/1999 |
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| B000823 | GRINDING MILL FEED No. 2 | C-7 Transfer Belt conveyor, 30 in by 40 ft: ... | 02/15/2011 | 02/29/2012 |
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| B000825 | No. 2 LANTHANUM - BULK LOADING | SC-825 Screw Conveyor, 1 ft by 10 ft: 3 h... | 02/10/2026 | 02/28/2027 |
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| B000828 | SKINNER ROASTER SYSTEM | N/A | 02/15/2011 | 02/29/2012 |
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| B000840 | BOILER - STEAM | N/A | 03/12/2013 | 02/28/2014 |
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| B000841 | DRYER SYSTEM - No.1 CERIUM CIRCUIT | N/A | 02/15/2011 | 02/29/2012 |
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| B000826 | No. 1 CERIUM CONCENTRATE BAGGING MACHINE | F-8 Blower for both North and South Sacking Mac... | 02/15/2011 | 02/29/2012 |
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| B000842 | SODA ASH SYSTEM - CHEMICAL PLANT | SC-14 Screw Conveyor, 3 in in diameter and 6 ... | 02/15/2011 | 02/29/2012 |
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| B001099 | BOILER - SPECIALTY | a Cleaver-Brooks, Model CB 250, which is fired o... | 03/12/2013 | 02/28/2014 |
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| B000846 | CRUSHING PLANT No. 3 | N/A | 02/15/2011 | 02/29/2012 |
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| B001936 | SX TANKS, LANTHANIDE PROCESS | The following descriptions, definitions and cond... | 02/10/2026 | 02/28/2027 |
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| B001938 | LEAD PRECIPITATION SYSTEM - LANTHANUM | N/A | 02/10/2026 | 02/28/2027 |
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| B001941 | LEACH/CCD CIRCUIT - LANTHANIDES PROCESS | N/A | 02/10/2026 | 02/28/2027 |
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