# Relationship history for MSHA mine 4603807

Current hierarchy: **Massey Energy Company → Rockridge Coal Company Inc → Orifice**

- 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:** Consolidation Coal Company → Orifice; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Orifice; 1950-01-01 to 2013-12-04; source msha-controller-operator-history
- **controller_controls_operator:** CONSOL Energy Inc → Consolidation Coal Company; 1950-01-01 to 1978-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Orifice; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Bear Mining Company Inc → Orifice; 1978-12-01 to 1988-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Big Bear Mining Company Inc; 1978-12-01 to 1988-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Orifice; 1986-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genesis Coal Company Inc → Orifice; 1988-04-20 to 1989-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Buthcher Brenda → Orifice; 1988-04-20 to 1989-11-30; source msha-controller-operator-history
- **controller_controls_operator:** Buthcher Brenda → Genesis Coal Company Inc; 1988-04-20 to 1989-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Rockridge Coal Company Inc → Orifice; 1989-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Rockridge Coal Company Inc; 1989-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Orifice; 2013-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Consolidation Coal Company; 2013-12-05 to 1978-11-30; source msha-controller-operator-history