# Relationship history for MSHA mine 4602250

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Green Valley Coal Company → No 8 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:** Imperial Coal & Construction Company Inc → No 8 Mine; 1950-01-01 to 1974-07-07; source msha-controller-operator-history
- **controller_controls_mine:** T W Oil Inc → No 8 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T W Oil Inc → Imperial Coal & Construction Company Inc; 1950-01-01 to 1974-07-07; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → No 8 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Westmoreland Coal Company → No 8 Mine; 1974-07-08 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1974-07-08 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lady H Coal Company Inc → No 8 Mine; 1986-04-01 to 1990-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Poval Corporation → No 8 Mine; 1986-04-01 to 1990-01-18; source msha-controller-operator-history
- **controller_controls_operator:** Poval Corporation → Lady H Coal Company Inc; 1986-04-01 to 1990-01-18; source msha-controller-operator-history
- **operator_operates_mine:** Lady H Coal Company Inc → No 8 Mine; 1990-01-19 to 1992-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Lady H Corporation → No 8 Mine; 1990-01-19 to 1992-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Lady H Corporation → Lady H Coal Company Inc; 1990-01-19 to 1992-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Lady H Coal Company Inc → No 8 Mine; 1992-07-13 to 1996-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Sewell Inc → No 8 Mine; 1992-07-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Sewell Inc → Lady H Coal Company Inc; 1992-07-13 to 1996-05-19; source msha-controller-operator-history
- **operator_operates_mine:** Green Valley Coal Company → No 8 Mine; 1996-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 8 Mine; 1996-05-20 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Green Valley Coal Company; 1996-05-20 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 8 Mine; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Green Valley Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → No 8 Mine; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Green Valley Coal Company; 2016-07-26 to current/open; source msha-controller-operator-history