# Relationship history for MSHA mine 0900111

Current hierarchy: **Imerys S A → Imerys Clays Inc → Sandersville Calcine 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:** Anglo American Clays Corp → Sandersville Calcine Plant; 1950-01-01 to 1999-12-21; source msha-controller-operator-history
- **controller_controls_mine:** English China Clays PLC → Sandersville Calcine Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** English China Clays PLC → Anglo American Clays Corp; 1950-01-01 to 1999-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Clays Inc → Sandersville Calcine Plant; 1999-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → Sandersville Calcine Plant; 1999-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Clays Inc; 1999-12-22 to current/open; source msha-controller-operator-history