# Relationship history for MSHA mine 4607047

Current hierarchy: **Everett E  Ballard Jr → Ballard Brothers Coal Inc → Silver Fox**

- 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:** Eastern Gas & Fuel Association → Silver Fox; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Associated Coal Corp → Silver Fox; 1985-12-01 to 1986-10-12; source msha-controller-operator-history
- **controller_controls_operator:** Eastern Gas & Fuel Association → Eastern Associated Coal Corp; 1985-12-01 to 1986-10-12; source msha-controller-operator-history
- **operator_operates_mine:** Sundance Coal Company → Silver Fox; 1986-10-13 to 1992-09-14; source msha-controller-operator-history
- **controller_controls_mine:** White Mountain Mining Co., LLC → Silver Fox; 1986-10-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Sundance Coal Company; 1986-10-13 to 1992-09-14; source msha-controller-operator-history
- **controller_controls_mine:** Everett E  Ballard Jr → Silver Fox; 1991-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ballard Brothers Coal Inc → Silver Fox; 1992-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Everett E  Ballard Jr → Ballard Brothers Coal Inc; 1992-09-15 to current/open; source msha-controller-operator-history