# Relationship history for MSHA mine 1513492

Current hierarchy: **Shortridge Keaster → Black Hole Mining Of Old Kentucky Inc → Black Hole No 3**

- 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

- **operator_operates_mine:** D V & C Coal Company → Black Hole No 3; 1982-05-01 to 1983-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Vaughn Estille → Black Hole No 3; 1982-05-01 to 1983-07-12; source msha-controller-operator-history
- **controller_controls_operator:** Vaughn Estille → D V & C Coal Company; 1982-05-01 to 1983-07-12; source msha-controller-operator-history
- **operator_operates_mine:** Black Gold Management Inc → Black Hole No 3; 1983-07-13 to 1985-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Hamilton Vincent → Black Hole No 3; 1983-07-13 to 1985-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Hamilton Vincent → Black Gold Management Inc; 1983-07-13 to 1985-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Black Hole Mining Of Old Kentucky Inc → Black Hole No 3; 1985-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shortridge Keaster Et Al → Black Hole No 3; 1985-06-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shortridge Keaster Et Al → Black Hole Mining Of Old Kentucky Inc; 1985-06-28 to current/open; source msha-controller-operator-history