# Relationship history for MSHA mine 4605403

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Green Valley Coal Company → No 2 Preparation 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:** John B  Harris → No 2 Preparation Plant; 1973-09-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** John B Harris Inc → No 2 Preparation Plant; 1977-01-01 to 1995-11-30; source msha-controller-operator-history
- **controller_controls_operator:** John B  Harris → John B Harris Inc; 1977-01-01 to 1995-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Albert F  Robinson → No 2 Preparation Plant; 1989-01-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lappitt Inc → No 2 Preparation Plant; 1995-12-01 to 1998-02-03; source msha-controller-operator-history
- **controller_controls_operator:** Albert F  Robinson → Lappitt Inc; 1995-12-01 to 1998-02-03; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → No 2 Preparation Plant; 1996-05-20 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Harris Export Coal Corp → No 2 Preparation Plant; 1998-02-04 to 2000-04-11; source msha-controller-operator-history
- **controller_controls_mine:** John B  Harris → No 2 Preparation Plant; 1998-02-04 to 2000-04-11; source msha-controller-operator-history
- **controller_controls_operator:** John B  Harris → Harris Export Coal Corp; 1998-02-04 to 2000-04-11; source msha-controller-operator-history
- **operator_operates_mine:** Green Valley Coal Company → No 2 Preparation Plant; 2000-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Green Valley Coal Company; 2000-04-12 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → No 2 Preparation Plant; 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 2 Preparation Plant; 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