# Relationship history for MSHA mine 4603158

Current hierarchy: **Alpha Natural Resources, Inc. → Herndon Processing Company LLC → Keystone No 2 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:** Kennie Ray  Childers → Keystone No 2 Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Associated Coal Corp → Keystone No 2 Plant; 1950-01-01 to 1986-08-20; source msha-controller-operator-history
- **controller_controls_mine:** Eastern Gas & Fuel Association → Keystone No 2 Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Gas & Fuel Association → Eastern Associated Coal Corp; 1950-01-01 to 1986-08-20; source msha-controller-operator-history
- **operator_operates_mine:** Genoa Coal Company Inc → Keystone No 2 Plant; 1986-08-21 to 1987-09-10; source msha-controller-operator-history
- **controller_controls_operator:** Kennie Ray  Childers → Genoa Coal Company Inc; 1986-08-21 to 1987-09-10; source msha-controller-operator-history
- **operator_operates_mine:** Benafuels Inc → Keystone No 2 Plant; 1987-09-11 to 1990-08-08; source msha-controller-operator-history
- **controller_controls_mine:** Bruce R  Davis → Keystone No 2 Plant; 1987-09-11 to 1990-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Bruce R  Davis → Benafuels Inc; 1987-09-11 to 1990-08-08; source msha-controller-operator-history
- **operator_operates_mine:** Herndon Processing Company → Keystone No 2 Plant; 1990-08-09 to 2003-03-10; source msha-controller-operator-history
- **controller_controls_mine:** American Metals & Coal International Inc → Keystone No 2 Plant; 1990-08-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** American Metals & Coal International Inc → Herndon Processing Company; 1990-08-09 to 2003-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Herndon Processing Company LLC → Keystone No 2 Plant; 2003-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Keystone No 2 Plant; 2003-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Herndon Processing Company LLC; 2003-03-11 to current/open; source msha-controller-operator-history