# Relationship history for MSHA mine 4602758

Current hierarchy: **Massey Energy Company → Rockridge Coal Company Inc → Oasis 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:** Consolidation Coal Company → Oasis Mine; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** CONSOL Energy Inc → Oasis Mine; 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 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Oasis Mine; 1978-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Big Bear Mining Company Inc → Oasis Mine; 1979-01-01 to 1987-11-22; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Big Bear Mining Company Inc; 1979-01-01 to 1987-11-22; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Oasis Mine; 1986-08-18 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Favor Coal Company Inc → Oasis Mine; 1987-11-23 to 1989-01-23; source msha-controller-operator-history
- **controller_controls_mine:** Spencer William Et Al → Oasis Mine; 1987-11-23 to 1989-01-23; source msha-controller-operator-history
- **controller_controls_operator:** Spencer William Et Al → Favor Coal Company Inc; 1987-11-23 to 1989-01-23; source msha-controller-operator-history
- **operator_operates_mine:** L & M Coal Corp → Oasis Mine; 1989-01-24 to 1989-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Lyall Jerry Et Al → Oasis Mine; 1989-01-24 to 1989-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Lyall Jerry Et Al → L & M Coal Corp; 1989-01-24 to 1989-08-24; source msha-controller-operator-history
- **operator_operates_mine:** Rockridge Coal Company Inc → Oasis Mine; 1989-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Rockridge Coal Company Inc; 1989-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert E  Murray → Oasis Mine; 2013-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert E  Murray → Consolidation Coal Company; 2013-12-05 to 1978-12-31; source msha-controller-operator-history