# Relationship history for MSHA mine 4401463

Current hierarchy: **El Paso Energy Corp → Virginia Iron Coal & Coke Company → Dale Ridge Complex**

- 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:** Virginia Iron Coal & Coke Company → Dale Ridge Complex; 1950-01-01 to 1979-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Bav Liquidating Corp → Dale Ridge Complex; 1950-01-01 to 1979-06-28; source msha-controller-operator-history
- **controller_controls_operator:** Bav Liquidating Corp → Virginia Iron Coal & Coke Company; 1950-01-01 to 1979-06-28; source msha-controller-operator-history
- **operator_operates_mine:** Virginia Iron Coal & Coke Company → Dale Ridge Complex; 1979-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** El Paso Energy Corp → Dale Ridge Complex; 1979-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** El Paso Energy Corp → Virginia Iron Coal & Coke Company; 1979-06-29 to current/open; source msha-controller-operator-history