# Relationship history for MSHA mine 4606175

Current hierarchy: **White Mountain Mining Co., LLC → Shiloh Energy Company Inc → Remington**

- 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:** Porter Coal Company Inc → Remington; 1980-10-01 to 1983-04-07; source msha-controller-operator-history
- **controller_controls_mine:** Porter Thomas M → Remington; 1980-10-01 to 1983-04-07; source msha-controller-operator-history
- **controller_controls_operator:** Porter Thomas M → Porter Coal Company Inc; 1980-10-01 to 1983-04-07; source msha-controller-operator-history
- **operator_operates_mine:** Shiloh Energy Company Inc → Remington; 1983-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** White Mountain Mining Co., LLC → Remington; 1983-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** White Mountain Mining Co., LLC → Shiloh Energy Company Inc; 1983-04-08 to current/open; source msha-controller-operator-history