# Relationship history for MSHA mine 1202249

Current hierarchy: **Hallador Energy Company → Sunrise Coal, LLC → Prosperity 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

- **operator_operates_mine:** Five Star Mining Inc → Prosperity Mine; 1999-03-01 to 2014-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Blankenberger → Prosperity Mine; 1999-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Blankenberger → Five Star Mining Inc; 1999-03-01 to 2014-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Ronald E  Laswell et al → Prosperity Mine; 2003-06-04 to 2012-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Brent K  Bilsland et al → Prosperity Mine; 2012-04-26 to 2018-05-10; source msha-controller-operator-history
- **operator_operates_mine:** Sunrise Coal, LLC → Prosperity Mine; 2014-08-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brent K  Bilsland et al → Sunrise Coal, LLC; 2014-08-30 to 2018-05-10; source msha-controller-operator-history
- **controller_controls_operator:** Ronald E  Laswell et al → Sunrise Coal, LLC; 2014-08-30 to 2012-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Hallador Energy Company → Prosperity Mine; 2018-05-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hallador Energy Company → Sunrise Coal, LLC; 2018-05-11 to current/open; source msha-controller-operator-history