# Relationship history for MSHA mine 1516763

Current hierarchy: **Horizon Natural Resources Incorporated → Clark Elkhorn Coal Co. → Gardner Fork**

- 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:** James P  Lowe → Gardner Fork; 1986-04-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Richard E  Salyer et al → Gardner Fork; 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Poverty Coal Company Inc → Gardner Fork; 1989-11-01 to 1990-04-10; source msha-controller-operator-history
- **controller_controls_operator:** James P  Lowe → Poverty Coal Company Inc; 1989-11-01 to 1990-04-10; source msha-controller-operator-history
- **operator_operates_mine:** Kilowatt Coal Company Inc → Gardner Fork; 1990-04-11 to 1998-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Richard E  Salyer et al → Kilowatt Coal Company Inc; 1990-04-11 to 1998-02-11; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → Gardner Fork; 1992-11-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Gardner Fork; 1998-02-12 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Clark Elkhorn Coal Company; 1998-02-12 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Carl  Kirk et al → Gardner Fork; 1998-02-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Company → Gardner Fork; 1998-09-02 to 2001-01-17; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → Gardner Fork; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Clark Elkhorn Coal Company; 1998-09-02 to 2001-01-17; source msha-controller-operator-history
- **operator_operates_mine:** North Star Mining Inc → Gardner Fork; 2001-01-18 to 2001-09-09; source msha-controller-operator-history
- **controller_controls_operator:** Carl  Kirk et al → North Star Mining Inc; 2001-01-18 to 2001-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Clark Elkhorn Coal Co. → Gardner Fork; 2001-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Clark Elkhorn Coal Co.; 2001-09-10 to current/open; source msha-controller-operator-history