# Relationship history for MSHA mine 4604637

Current hierarchy: **Alpha Metallurgical Resources Inc → Kepler Processing Company LLC → Kepler No. 1 Prep Plant**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Nippon Kokan K K et al → Kepler No. 1 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** National Mines Corp → Kepler No. 1 Prep Plant; 1975-07-15 to 1995-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Nippon Kokan K K et al → National Mines Corp; 1975-07-15 to 1995-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Joe (John J)  Childress et al → Kepler No. 1 Prep Plant; 1992-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Keyrock Energy Inc → Kepler No. 1 Prep Plant; 1995-06-01 to 1995-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Joe (John J)  Childress et al → Keyrock Energy Inc; 1995-06-01 to 1995-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Catherine  Childress et al → Keyrock Energy Inc; 1995-06-01 to 1995-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Kepler Processing Company LLC → Kepler No. 1 Prep Plant; 1995-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** American Metals & Coal International Inc → Kepler No. 1 Prep Plant; 1995-06-29 to 2003-03-10; source msha-controller-operator-history
- **controller_controls_operator:** American Metals & Coal International Inc → Kepler Processing Company LLC; 1995-06-29 to 2003-03-10; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Kepler No. 1 Prep Plant; 2003-03-11 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Kepler Processing Company LLC; 2003-03-11 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Kepler No. 1 Prep Plant; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Kepler Processing Company LLC; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Kepler No. 1 Prep Plant; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Kepler Processing Company LLC; 2018-11-09 to current/open; source msha-controller-operator-history