# Relationship history for MSHA mine 4609227

Current hierarchy: **James C  Justice III → Frontier Coal Company, Inc. → Double Camp No. 1**

- 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

- **operator_operates_mine:** Frontier Coal Company, Inc. → Double Camp No. 1; 2007-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice II et al → Double Camp No. 1; 2007-08-29 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Frontier Coal Company, Inc.; 2007-08-29 to 2009-05-06; source msha-controller-operator-history
- **controller_controls_mine:** Mechel Oao → Double Camp No. 1; 2009-05-07 to 2015-02-11; source msha-controller-operator-history
- **controller_controls_operator:** Mechel Oao → Frontier Coal Company, Inc.; 2009-05-07 to 2015-02-11; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice II et al → Double Camp No. 1; 2015-02-12 to 2017-06-07; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice II et al → Frontier Coal Company, Inc.; 2015-02-12 to 2017-06-07; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice lll et al → Double Camp No. 1; 2017-06-08 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice lll et al → Frontier Coal Company, Inc.; 2017-06-08 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_operator:** Jillean L  Justice et al → Frontier Coal Company, Inc.; 2017-06-08 to 2022-08-23; source msha-controller-operator-history
- **controller_controls_mine:** James C  Justice III → Double Camp No. 1; 2022-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James C  Justice III → Frontier Coal Company, Inc.; 2022-08-24 to current/open; source msha-controller-operator-history