# Relationship history for MSHA mine 4601387

Current hierarchy: **Alpha Metallurgical Resources Inc → Spartan Mining Company → Spring Branch Mine**

- 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:** W-P Coal Company → Spring Branch Mine; 1950-01-01 to 2000-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Wheeling-Pittsburgh Corp → Spring Branch Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wheeling-Pittsburgh Corp → W-P Coal Company; 1950-01-01 to 2000-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Spring Branch Mine; 1996-02-05 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Spartan Mining Company → Spring Branch Mine; 2000-04-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Spartan Mining Company; 2000-04-18 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Spring Branch Mine; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Spartan Mining Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Spring Branch Mine; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Spartan Mining Company; 2016-07-26 to 2018-11-08; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Metallurgical Resources Inc → Spring Branch Mine; 2018-11-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Metallurgical Resources Inc → Spartan Mining Company; 2018-11-09 to current/open; source msha-controller-operator-history