# Relationship history for MSHA mine 4602275

Current hierarchy: **Hawley Charbon → Pocahontas Red Ash Mining Co → Poca Red Ash Prep Plant**

- 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

- **operator_operates_mine:** Pocahontas Red Ash Mining Company → Poca Red Ash Prep Plant; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Belco Petroleum Corp → Poca Red Ash Prep Plant; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Belco Petroleum Corp → Pocahontas Red Ash Mining Company; 1950-01-01 to 1974-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Pocahontas Red Ash Mining Co → Poca Red Ash Prep Plant; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hawley Charbon → Poca Red Ash Prep Plant; 1974-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawley Charbon → Pocahontas Red Ash Mining Co; 1974-11-01 to current/open; source msha-controller-operator-history