# Relationship history for MSHA mine 0900354

Current hierarchy: **Imerys S A → Imerys Kaolin Inc → JEFFERSONVILLE PLANT**

- 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

- **operator_operates_mine:** Cyprus Industrial Minerals Company → JEFFERSONVILLE PLANT; 1950-01-01 to 1977-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Cyprus Mines Corp → JEFFERSONVILLE PLANT; 1950-01-01 to 1980-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Cyprus Mines Corp → Cyprus Industrial Minerals Company; 1950-01-01 to 1977-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Nord Kaolin Company → JEFFERSONVILLE PLANT; 1978-01-01 to 1997-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Nord Resources Corp → JEFFERSONVILLE PLANT; 1978-01-01 to 1997-04-22; source msha-controller-operator-history
- **controller_controls_operator:** Nord Resources Corp → Nord Kaolin Company; 1978-01-01 to 1997-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Kaolin Inc → JEFFERSONVILLE PLANT; 1997-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → JEFFERSONVILLE PLANT; 1997-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Kaolin Inc; 1997-04-23 to current/open; source msha-controller-operator-history