# Relationship history for MSHA mine 4608135

Current hierarchy: **Gary D  Spurlock → Copperas Coal Corp → Red Oak**

- 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:** Massey Energy Company → Red Oak; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → Red Oak; 1992-01-01 to 1992-05-11; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1992-01-01 to 1992-05-11; source msha-controller-operator-history
- **operator_operates_mine:** Big Oak Mining Company → Red Oak; 1992-05-12 to 1993-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Goff Mauriene → Red Oak; 1992-05-12 to 1993-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Goff Mauriene → Big Oak Mining Company; 1992-05-12 to 1993-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Gary D  Spurlock → Red Oak; 1992-10-07 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Copperas Coal Corp → Red Oak; 1993-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Gary D  Spurlock → Copperas Coal Corp; 1993-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Red Oak; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Omar Mining Company; 2011-06-01 to 1992-05-11; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Red Oak; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Omar Mining Company; 2016-07-26 to 1992-05-11; source msha-controller-operator-history