# Relationship history for MSHA mine 2602264

Current hierarchy: **Cemex S A → Rinker Materials West Llc → BLUE DIAMOND MATERIALS, INC.**

- 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:** Hanson PLC → BLUE DIAMOND MATERIALS, INC.; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → BLUE DIAMOND MATERIALS, INC.; 1990-02-02 to 2003-03-31; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Materials Inc → BLUE DIAMOND MATERIALS, INC.; 1994-09-01 to 1999-05-05; source msha-controller-operator-history
- **controller_controls_mine:** Washington Group International Inc → BLUE DIAMOND MATERIALS, INC.; 1994-09-01 to 1999-05-05; source msha-controller-operator-history
- **controller_controls_operator:** Washington Group International Inc → Blue Diamond Materials Inc; 1994-09-01 to 1999-05-05; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Materials Inc → BLUE DIAMOND MATERIALS, INC.; 1999-05-06 to 2000-11-26; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → BLUE DIAMOND MATERIALS, INC.; 1999-05-06 to 2000-11-26; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Blue Diamond Materials Inc; 1999-05-06 to 2000-11-26; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Materials → BLUE DIAMOND MATERIALS, INC.; 2000-11-27 to 2001-09-16; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Blue Diamond Materials; 2000-11-27 to 2001-09-16; source msha-controller-operator-history
- **operator_operates_mine:** Rinker Materials West Llc → BLUE DIAMOND MATERIALS, INC.; 2001-09-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Rinker Materials West Llc; 2001-09-17 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → BLUE DIAMOND MATERIALS, INC.; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Rinker Materials West Llc; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → BLUE DIAMOND MATERIALS, INC.; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Rinker Materials West Llc; 2007-07-10 to current/open; source msha-controller-operator-history