# Relationship history for MSHA mine 4606491

Current hierarchy: **Richard H  Abraham → Laurel Creek Mining Company Inc → 13-A 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Massey Energy Company → 13-A Mine; 1950-01-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Richard H  Abraham et al → 13-A Mine; 1975-05-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omar Mining Company → 13-A Mine; 1982-02-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Omar Mining Company; 1982-02-01 to 1990-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Laurel Creek Mining Company Inc → 13-A Mine; 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard H  Abraham et al → Laurel Creek Mining Company Inc; 1990-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → 13-A Mine; 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 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → 13-A Mine; 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 1990-07-31; source msha-controller-operator-history