# Relationship history for MSHA mine 1202010

Current hierarchy: **Peabody Energy Corporation → Peabody Midwest Mining, LLC → Air Quality #1 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:** Shand Alexander (Holdings) Ltd → Air Quality #1 Mine; 1986-09-01 to 1992-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Underground Coal Inc → Air Quality #1 Mine; 1987-08-01 to 1992-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Shand Alexander (Holdings) Ltd → Underground Coal Inc; 1987-08-01 to 1992-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Black Beauty Resources → Air Quality #1 Mine; 1991-08-20 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Black Beauty Underground Inc → Air Quality #1 Mine; 1992-02-28 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_operator:** Black Beauty Resources → Black Beauty Underground Inc; 1992-02-28 to 1999-04-11; source msha-controller-operator-history
- **controller_controls_mine:** Peabody Energy Corporation → Air Quality #1 Mine; 1997-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Peabody Midwest Mining, LLC → Air Quality #1 Mine; 1999-04-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Peabody Energy Corporation → Peabody Midwest Mining, LLC; 1999-04-12 to current/open; source msha-controller-operator-history