# Relationship history for MSHA mine 0504885

Current hierarchy: **Alan E  Chiles → Rimrock Exploration & Development Inc. → J-Bird**

- 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:** Blue Rock Resources Ltd → J-Bird; 2007-11-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Rock Energy Corp → J-Bird; 2007-11-28 to 2009-02-25; source msha-controller-operator-history
- **controller_controls_operator:** Blue Rock Resources Ltd → Blue Rock Energy Corp; 2007-11-28 to 2009-02-25; source msha-controller-operator-history
- **controller_controls_mine:** Alan E  Chiles → J-Bird; 2008-07-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rimrock Exploration & Development Inc. → J-Bird; 2009-02-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alan E  Chiles → Rimrock Exploration & Development Inc.; 2009-02-26 to current/open; source msha-controller-operator-history