# Relationship history for MSHA mine 3304364

Current hierarchy: **Imerys S A → Luzenac America, Inc. → CANFIELD MILL**

- 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:** Rio Tinto Group → CANFIELD MILL; 1992-07-01 to 2011-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Luzenac America, Inc. → CANFIELD MILL; 1995-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Luzenac America, Inc.; 1995-12-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → CANFIELD MILL; 2011-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Luzenac America, Inc.; 2011-08-01 to current/open; source msha-controller-operator-history