# Relationship history for MSHA mine 0100433

Current hierarchy: **Imerys S A → Luzenac America, Inc. → ALPINE 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Cyprus Mines Corp → ALPINE MILL; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **operator_operates_mine:** American Talc Company Inc → ALPINE MILL; 1950-01-01 to 1980-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Bixby Peter H → ALPINE MILL; 1950-01-01 to 1980-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Bixby Peter H → American Talc Company Inc; 1950-01-01 to 1980-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Industrial Minerals Company → ALPINE MILL; 1980-01-15 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Mines Corp → Cyprus Industrial Minerals Company; 1980-01-15 to 1980-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Cyprus Mines Corp → ALPINE MILL; 1980-09-22 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Amax Minerals Company → ALPINE MILL; 1980-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Amax Minerals Company → Cyprus Mines Corp; 1980-09-22 to 1992-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Luzenac America, Inc. → ALPINE MILL; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → ALPINE MILL; 1992-07-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → Luzenac America, Inc.; 1992-07-01 to 2011-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → ALPINE 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