# Relationship history for MSHA mine 4603317

Current hierarchy: **Alpha Metallurgical Resources Inc → Mammoth Coal → Mammoth Coal  Processing Pl & Riv Tipple**

- 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

- **operator_operates_mine:** Cannelton Industries Inc → Mammoth Coal  Processing Pl & Riv Tippl; 1950-01-01 to 1998-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → Mammoth Coal  Processing Pl & Riv Tippl; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cannelton Industries Inc; 1950-01-01 to 1998-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Mammoth Coal  Processing Pl & Riv Tippl; 1996-02-05 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Cannelton Industries Inc → Mammoth Coal  Processing Pl & Riv Tippl; 1998-06-29 to 2004-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Mammoth Coal  Processing Pl & Riv Tippl; 1998-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Cannelton Industries Inc; 1998-06-29 to 2004-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Mammoth Coal → Mammoth Coal  Processing Pl & Riv Tippl; 2004-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Mammoth Coal; 2004-10-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Mammoth Coal  Processing Pl & Riv Tippl; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Mammoth Coal; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Mammoth Coal  Processing Pl & Riv Tippl; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Mammoth Coal; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Mammoth Coal  Processing Pl & Riv Tippl; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Mammoth Coal; 2018-11-09 to current/open; source msha-controller-operator-history