# Relationship history for MSHA mine 1517913

Current hierarchy: **James R  Gibbs → Laurel Creek Mining Corp → No 4**

- 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 R  Gibbs et al → No 4; 1995-09-05 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Matrix Coal Company → No 4; 1997-03-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Zeigler Coal Holding Company → No 4; 1997-03-01 to 1998-09-01; source msha-controller-operator-history
- **controller_controls_operator:** Zeigler Coal Holding Company → Matrix Coal Company; 1997-03-01 to 1998-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Matrix Coal Company → No 4; 1998-09-02 to 1999-07-19; source msha-controller-operator-history
- **controller_controls_mine:** Horizon Natural Resources Incorporated → No 4; 1998-09-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Horizon Natural Resources Incorporated → Matrix Coal Company; 1998-09-02 to 1999-07-19; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Creek Mining Corp → No 4; 1999-07-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James R  Gibbs et al → Laurel Creek Mining Corp; 1999-07-20 to current/open; source msha-controller-operator-history