# Relationship history for MSHA mine 4601474

Current hierarchy: **Alpha Natural Resources, Inc. → White Buck Coal Company → Grassy Creek No 2**

- 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

- **operator_operates_mine:** Westmoreland Coal Company → Grassy Creek No 2; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Westmoreland Coal Company → Grassy Creek No 2; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Westmoreland Coal Company → Westmoreland Coal Company; 1950-01-01 to 1986-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Lady H Coal Company Inc → Grassy Creek No 2; 1986-04-01 to 1990-01-18; source msha-controller-operator-history
- **controller_controls_mine:** Poval Corporation → Grassy Creek No 2; 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 → Grassy Creek No 2; 1990-01-19 to 1990-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Lady H Corporation → Grassy Creek No 2; 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 1990-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Leivasy Mining Corp → Grassy Creek No 2; 1990-05-14 to 1992-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Pearson Frank R → Grassy Creek No 2; 1990-05-14 to 1992-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Pearson Frank R → Leivasy Mining Corp; 1990-05-14 to 1992-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Eastwood Construction Inc → Grassy Creek No 2; 1992-07-13 to 1996-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Consolidated Sewell Inc → Grassy Creek No 2; 1992-07-13 to 1996-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Consolidated Sewell Inc → Eastwood Construction Inc; 1992-07-13 to 1996-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Grassy Creek No 2; 1995-04-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** White Buck Coal Company → Grassy Creek No 2; 1996-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → White Buck Coal Company; 1996-05-20 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Grassy Creek No 2; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → White Buck Coal Company; 2011-06-01 to current/open; source msha-controller-operator-history