# Relationship history for MSHA mine 0102857

Current hierarchy: **Thornberry Earl → Midstates Industrial Of Alabama Inc → Steep Creek**

- 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:** Midstates Industrial Of Alabama Inc → Steep Creek; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thornberry Earl → Steep Creek; 1990-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thornberry Earl → Midstates Industrial Of Alabama Inc; 1990-03-01 to current/open; source msha-controller-operator-history