# Relationship history for MSHA mine 4608177

Current hierarchy: **Sandra  Dotson → Seaboard Energy Inc → Mine No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Michael C  Castle → Mine No 1; 1988-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big South Mining & Construction Company Inc → Mine No 1; 1992-05-01 to 1992-10-06; source msha-controller-operator-history
- **controller_controls_operator:** Michael C  Castle → Big South Mining & Construction Company Inc; 1992-05-01 to 1992-10-06; source msha-controller-operator-history
- **operator_operates_mine:** Copperas Coal Corp → Mine No 1; 1992-10-07 to 1994-03-13; source msha-controller-operator-history
- **controller_controls_mine:** Gary D  Spurlock → Mine No 1; 1992-10-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Spurlock → Copperas Coal Corp; 1992-10-07 to 1994-03-13; source msha-controller-operator-history
- **operator_operates_mine:** Kennison Development Inc → Mine No 1; 1994-03-14 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Compton Kennie D → Mine No 1; 1994-03-14 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Compton Kennie D → Kennison Development Inc; 1994-03-14 to 1995-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Sandra  Dotson → Mine No 1; 1994-10-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Seaboard Energy Inc → Mine No 1; 1995-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sandra  Dotson → Seaboard Energy Inc; 1995-03-01 to current/open; source msha-controller-operator-history