# Relationship history for MSHA mine 1800343

Current hierarchy: **Imerys S A → Imerys Carbonates USA, Inc. → CALCIUM CARBONATE PLANT/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

- **operator_operates_mine:** Flintkote Stone Products Company → CALCIUM CARBONATE PLANT/MILL; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Flintkote Company → CALCIUM CARBONATE PLANT/MILL; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Flintkote Company → Flintkote Stone Products Company; 1950-01-01 to 1980-04-06; source msha-controller-operator-history
- **controller_controls_mine:** Cimenteries Cbr Cementbedrijven → CALCIUM CARBONATE PLANT/MILL; 1980-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → CALCIUM CARBONATE PLANT/MILL; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Cimenteries Cbr Cementbedrijven → Genstar Stone Products Company; 1980-04-07 to 1986-11-03; source msha-controller-operator-history
- **controller_controls_mine:** English China Clays PLC → CALCIUM CARBONATE PLANT/MILL; 1986-10-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Genstar Stone Products Company → CALCIUM CARBONATE PLANT/MILL; 1986-11-04 to 1995-11-20; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → CALCIUM CARBONATE PLANT/MILL; 1986-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Genstar Stone Products Company; 1986-11-04 to 1995-11-20; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → CALCIUM CARBONATE PLANT/MILL; 1989-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ecci Calcium Products Inc → CALCIUM CARBONATE PLANT/MILL; 1995-11-21 to 1999-12-31; source msha-controller-operator-history
- **controller_controls_operator:** English China Clays PLC → Ecci Calcium Products Inc; 1995-11-21 to 1999-12-31; source msha-controller-operator-history
- **operator_operates_mine:** ECCA Calcium Products Inc. → CALCIUM CARBONATE PLANT/MILL; 2000-01-01 to 2015-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Imerys S A → CALCIUM CARBONATE PLANT/MILL; 2000-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → ECCA Calcium Products Inc.; 2000-01-01 to 2015-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Imerys Carbonates USA, Inc. → CALCIUM CARBONATE PLANT/MILL; 2015-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Imerys S A → Imerys Carbonates USA, Inc.; 2015-12-31 to current/open; source msha-controller-operator-history