# Relationship history for MSHA mine 4607983

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Riverside Energy Company, LLC → Postar 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Charles  Adkins → Postar No 1 Mine; 1989-06-19 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jack  Slone et al → Postar No 1 Mine; 1989-08-10 to 1992-10-13; source msha-controller-operator-history
- **operator_operates_mine:** West Virginia-Tennessee Coal Sales Inc → Postar No 1 Mine; 1990-12-01 to 1991-05-14; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Adkins → West Virginia-Tennessee Coal Sales Inc; 1990-12-01 to 1991-05-14; source msha-controller-operator-history
- **operator_operates_mine:** Chestnut Creek Coal Company Inc → Postar No 1 Mine; 1991-05-15 to 1992-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Jack  Slone et al → Chestnut Creek Coal Company Inc; 1991-05-15 to 1992-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Postar Coal Company Inc → Postar No 1 Mine; 1992-10-14 to 2011-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Michael D  Poskas → Postar No 1 Mine; 1992-10-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael D  Poskas → Postar Coal Company Inc; 1992-10-14 to 2011-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Postar No 1 Mine; 2004-09-21 to 2016-07-25; source msha-controller-operator-history
- **operator_operates_mine:** Riverside Energy Company, LLC → Postar No 1 Mine; 2011-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Riverside Energy Company, LLC; 2011-04-04 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Postar No 1 Mine; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Riverside Energy Company, LLC; 2016-07-26 to current/open; source msha-controller-operator-history