# Relationship history for MSHA mine 4607720

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Twin Star Mining Inc → Twin Star No 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Donald  Nicewonder → Twin Star No 1 Mine; 1974-01-01 to 2005-11-01; source msha-controller-operator-history
- **operator_operates_mine:** Twin Star Mining Inc → Twin Star No 1 Mine; 1989-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Nicewonder → Twin Star Mining Inc; 1989-06-01 to 2005-11-01; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Twin Star No 1 Mine; 2005-11-02 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Twin Star Mining Inc; 2005-11-02 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Twin Star No 1 Mine; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Twin Star Mining Inc; 2016-07-26 to current/open; source msha-controller-operator-history