# Relationship history for MSHA mine 2901634

Current hierarchy: **Vulcan Materials Company → CalMat Co → Santa Ana**

- 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

- **operator_operates_mine:** Albuquerque Materials Inc → Santa Ana; 1950-01-01 to 1989-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert G  Morper → Santa Ana; 1950-01-01 to 1989-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Robert G  Morper → Albuquerque Materials Inc; 1950-01-01 to 1989-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Santa Ana; 1988-06-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile New Mexico Inc → Santa Ana; 1989-04-01 to 1998-02-10; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Mobile New Mexico Inc; 1989-04-01 to 1998-02-10; source msha-controller-operator-history
- **operator_operates_mine:** Western Mobile New Mexico Inc → Santa Ana; 1998-02-11 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Santa Ana; 1998-02-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Western Mobile New Mexico Inc; 1998-02-11 to 2001-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Santa Ana; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Southwest Inc. → Santa Ana; 2002-01-01 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Santa Ana; 2002-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Southwest Inc.; 2002-01-01 to 2014-08-28; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Santa Ana; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → Santa Ana; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2014-08-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2014-08-29 to 2007-11-15; source msha-controller-operator-history