# Relationship history for MSHA mine 0502500

Current hierarchy: **United States Government → U S Department Of Energy → Anvil Points 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:** Cleveland-Cliffs Iron Company → Anvil Points Mine; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_mine:** Cleveland-Cliffs Inc → Anvil Points Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cleveland-Cliffs Inc → Cleveland-Cliffs Iron Company; 1950-01-01 to 1979-09-04; source msha-controller-operator-history
- **controller_controls_mine:** United States Government → Anvil Points Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Development Engineering Inc → Anvil Points Mine; 1979-09-05 to 1982-05-18; source msha-controller-operator-history
- **controller_controls_mine:** Paraho Development Corp → Anvil Points Mine; 1979-09-05 to 1982-05-18; source msha-controller-operator-history
- **controller_controls_operator:** Paraho Development Corp → Development Engineering Inc; 1979-09-05 to 1982-05-18; source msha-controller-operator-history
- **operator_operates_mine:** U S Department Of Energy → Anvil Points Mine; 1982-05-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United States Government → U S Department Of Energy; 1982-05-19 to current/open; source msha-controller-operator-history