# Relationship history for MSHA mine 4607968

Current hierarchy: **Lexington Coal Holdings, Inc → Lexington Coal Company, LLC → Alloy Prep Plant #1**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Horizon Natural Resources Incorporated → Alloy Prep Plant #1; 1988-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Mining Inc → Alloy Prep Plant #1; 1990-11-01 to 1994-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Appalachian Mining Inc; 1990-11-01 to 1994-01-13; source msha-controller-operator-history
- **operator_operates_mine:** Vandalia Resources Inc → Alloy Prep Plant #1; 1994-01-14 to 2004-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Alloy Prep Plant #1; 1994-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Vandalia Resources Inc; 1994-01-14 to 2004-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Alloy Prep Plant #1; 1996-02-05 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** John C  Smith Jr → Alloy Prep Plant #1; 2001-03-19 to 2006-01-16; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Fuels, LLC → Alloy Prep Plant #1; 2004-01-14 to 2009-10-15; source msha-controller-operator-history
- **controller_controls_operator:** John C  Smith Jr → Appalachian Fuels, LLC; 2004-01-14 to 2006-01-16; source msha-controller-operator-history
- **controller_controls_mine:** Energy Coal Resources Inc → Alloy Prep Plant #1; 2006-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy Coal Resources Inc → Appalachian Fuels, LLC; 2006-01-17 to 2009-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Mammoth Coal Co. → Alloy Prep Plant #1; 2009-10-16 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Mammoth Coal Co.; 2009-10-16 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Alloy Prep Plant #1; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Mammoth Coal Co.; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Alloy Prep Plant #1; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Mammoth Coal Co.; 2016-07-26 to 2017-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company, LLC → Alloy Prep Plant #1; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → Alloy Prep Plant #1; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Holdings, Inc → Lexington Coal Company, LLC; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Alloy Prep Plant #1; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Mammoth Coal Co.; 2018-11-09 to 2017-10-22; source msha-controller-operator-history