# Relationship history for MSHA mine 0201565

Current hierarchy: **Amax Arizona Inc-Anaconda Arizona Inc → Anamax Mining Company → Twin Buttes-#1 Adit**

- 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:** Amax Arizona Inc-Anaconda Arizona Inc Et Al → Twin Buttes-#1 Adit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cementation Company Of America Inc → Twin Buttes-#1 Adit; 1950-01-01 to 1981-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Cementation Company Of America Inc → Twin Buttes-#1 Adit; 1950-01-01 to 1981-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Cementation Company Of America Inc → Cementation Company Of America Inc; 1950-01-01 to 1981-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Anamax Mining Company → Twin Buttes-#1 Adit; 1981-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amax Arizona Inc-Anaconda Arizona Inc Et Al → Anamax Mining Company; 1981-04-30 to current/open; source msha-controller-operator-history