# Relationship history for MSHA mine 4607362

Current hierarchy: **Staley James L → Southern Land Development Company → Mine #1**

- 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:** Klaproth Abner H → Mine #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Fork Coal Company Inc → Mine #1; 1987-09-01 to 1988-11-02; source msha-controller-operator-history
- **controller_controls_operator:** Klaproth Abner H → Big Fork Coal Company Inc; 1987-09-01 to 1988-11-02; source msha-controller-operator-history
- **operator_operates_mine:** Big Valley Coal Corp → Mine #1; 1988-11-03 to 1990-09-06; source msha-controller-operator-history
- **controller_controls_mine:** Klaproth Abner H & Joe Bill Bowers → Mine #1; 1988-11-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Klaproth Abner H & Joe Bill Bowers → Big Valley Coal Corp; 1988-11-03 to 1990-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Southern Land Development Company → Mine #1; 1990-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Staley James L → Mine #1; 1990-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Staley James L → Southern Land Development Company; 1990-09-07 to current/open; source msha-controller-operator-history