# Relationship history for MSHA mine 1518552

Current hierarchy: **Armstrong Energy Inc → Armstrong Coal Company Inc → Big Run Mine**

- 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:** Peabody Energy Corporation → Big Run Mine; 1995-06-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ohio County Coal Company → Big Run Mine; 2002-06-17 to 2007-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Peabody Energy Corporation → Ohio County Coal Company; 2002-06-17 to 2007-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Armstrong Coal Company Inc → Big Run Mine; 2007-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Armstrong Energy Inc → Big Run Mine; 2007-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Armstrong Energy Inc → Armstrong Coal Company Inc; 2007-04-01 to current/open; source msha-controller-operator-history