# Relationship history for MSHA mine 5001212

Current hierarchy: **Martineau Roger → Gem Exploration → Utica Placer 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:** Fields Exploration Company → Utica Placer Mine; 1950-01-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Fields Art → Utica Placer Mine; 1950-01-01 to 1981-08-25; source msha-controller-operator-history
- **controller_controls_operator:** Fields Art → Fields Exploration Company; 1950-01-01 to 1981-08-25; source msha-controller-operator-history
- **operator_operates_mine:** Gem Exploration → Utica Placer Mine; 1981-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martineau Roger → Utica Placer Mine; 1981-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martineau Roger → Gem Exploration; 1981-08-26 to current/open; source msha-controller-operator-history