General Information Party ID Party Name Party Classification Mailing Address Work Phone Email/Website 605017 John Espinoza null 67750 Bailey Road Hc1 Box 224 Mountain Pass, CA 92366 null jespinoza@mpmaterials.com Related Places Place ID Place Name County Region Place Type Relationship to Party Relationship Start Date Relationship End Date 215314 COMMUNITY & CO LANDFILLS-Molycorp San Bernardino 6B Land fill None null null 220454 DOMESTIC WASTEWATER T&DFs San Bernardino 6B Wastewater Treatment Facility Contact 07/12/2017 null 241610 Mountain Pass Mine & Mill Ops San Bernardino 6B Metal Mining Contact 07/12/2017 null 241611 Mountain Pass P-1 Closure San Bernardino 6B Metal Mining Contact 07/12/2017 null 244589 North Tailing Pond P-16 San Bernardino 6B Metal Mining Contact 07/12/2017 null 246044 Onsite Evaporation Ponds San Bernardino 6B Surface Impoundment Contact 07/12/2017 null Related Parties Party ID Party Name Party Type Role/Relationship Relationship Start Date Relationship End Date Classification 487446 MP Mine Operations LLC Organization Employee 07/12/2017 null Privately-Owned Business Regulatory Measures(non-enforcement) Reg. Measure ID Regulatory Measure Type Region WDID Title Status Program Order No. RM Effective Date RM Termination Date Relationship Relationship Start Date Relationship End Date 133369 WDR 6V 6B369807003 On-Site Evaporation Pond-Molycorp Minerals Active LNDISPOTH R6V-2005-0011 04/14/2005 null Discharger Contact 07/12/2017 null 306717 WDR 6V 6B369706002 Mountain Pass Mine (Community Landfill and Company Landfill) Active LFNONOPER R6V-2006-0024 06/14/2006 null Discharger Contact 07/12/2017 null 377626 WDR 6V 6B362098001 Revised WDR-Mountain Pass Mine & Mill Active LNDISPOTH R6V-2010-0047 10/14/2010 null Discharger Contact 07/12/2017 null 388260 WDR 6V 6B360011004 Mountain Pass Mine Wastewater Treatment Active WDRMUNIENROTH WQ 2014-0153-DWQ 11/07/2012 null Discharger Contact 07/12/2017 11/15/2021 132920 WDR 6V 6B360009001 WDR 2004-0042 No Tailings Pond Active LNDISPOTH R6V-2004-0042 10/14/2004 null Discharger Contact 07/12/2017 null 148001 WDR 6V 6B360008001 MOLYCORP INC Mountain Pass Mine and Mill Site (Closure and Post Closure Maintenance) Active LNDISPOTH 00-074 09/14/2000 null Discharger Contact 07/12/2017 null Violations within the past calendar year Violation ID Occurrence Date Violation Type Violation Description Violation Status Priority Source Facility Name Violated Reg. Meas. ID Violated Reg. Meas. Order No. Linked To Enf. Enforcement Actions Enforcement ID Enforcement Type Enf. Order No. Title Program Effective Date Status Regulatory Measures linked to Related Parties Reg. Measure ID Organization Regulatory Measure Type Program Effective Date Status 132920 MP Mine Operations LLC WDR LNDISPOTH 10/14/2004 Active 133369 MP Mine Operations LLC WDR LNDISPOTH 04/14/2005 Active 145895 MP Mine Operations LLC WDR LNDISP 06/13/1991 Historical 148001 MP Mine Operations LLC WDR LNDISPOTH 09/14/2000 Active 148025 MP Mine Operations LLC WDR WDRMUNIOWTS 04/11/2001 Historical 388260 MP Mine Operations LLC WDR WDRMUNIENROTH 11/07/2012 Active 306717 MP Mine Operations LLC WDR LFNONOPER 06/14/2006 Active 377626 MP Mine Operations LLC WDR LNDISPOTH 10/14/2010 Active 454473 MP Mine Operations LLC Enrollee - WDR CERFILLEXC 03/18/2024 Active 376674 MP Mine Operations LLC Enrollee - 401 Certification CERFILLEXC 12/02/2010 Historical