# Relationship history for MSHA mine 1512089

Current hierarchy: **Infinity Coal Corp → Citation Coal Corp → Preparation Plant**

- 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:** Schwab Charles F → Preparation Plant; 1979-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Henry Clay Mining Company Inc → Preparation Plant; 1979-10-01 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_operator:** Schwab Charles F → Henry Clay Mining Company Inc; 1979-10-01 to 1983-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Infinity Coal Corp → Preparation Plant; 1983-03-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** W C S Inc → Preparation Plant; 1983-06-24 to 1986-12-07; source msha-controller-operator-history
- **controller_controls_mine:** Earley William G → Preparation Plant; 1983-06-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Earley William G → W C S Inc; 1983-06-24 to 1986-12-07; source msha-controller-operator-history
- **operator_operates_mine:** Citation Coal Corp → Preparation Plant; 1986-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Infinity Coal Corp → Citation Coal Corp; 1986-12-08 to current/open; source msha-controller-operator-history