# Relationship history for MSHA mine 0404080

Current hierarchy: **Vulcan Materials Company → CalMat Co → Chula Vista Quarry**

- 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:** Nelson & Sloan → Chula Vista Quarry; 1950-01-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_mine:** James  Nelson → Chula Vista Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James  Nelson → Nelson & Sloan; 1950-01-01 to 1985-10-28; source msha-controller-operator-history
- **controller_controls_mine:** L D  Hawley → Chula Vista Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L S Hawley Corp → Chula Vista Quarry; 1985-10-29 to 1987-05-13; source msha-controller-operator-history
- **controller_controls_operator:** L D  Hawley → L S Hawley Corp; 1985-10-29 to 1987-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Chula Vista Quarry; 1987-05-01 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Nelson & Sloan → Chula Vista Quarry; 1987-05-14 to 1999-01-14; source msha-controller-operator-history
- **controller_controls_operator:** James  Nelson → Nelson & Sloan; 1987-05-14 to 1999-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Chula Vista Quarry; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Pacific Southwest Inc → Chula Vista Quarry; 1999-01-15 to 2007-01-14; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Pacific Southwest Inc; 1999-01-15 to 2007-01-14; source msha-controller-operator-history
- **operator_operates_mine:** Rimrock CA LLC → Chula Vista Quarry; 2007-01-15 to 2009-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Rimrock CA  LLC → Chula Vista Quarry; 2007-01-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rimrock CA  LLC → Rimrock CA LLC; 2007-01-15 to 2009-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Chula Vista Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Pacific Southwest Inc; 2007-08-23 to 2007-01-14; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Chula Vista Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Otay Valley Rock, LLC → Chula Vista Quarry; 2009-05-01 to 2010-12-29; source msha-controller-operator-history
- **controller_controls_mine:** John  Moller → Chula Vista Quarry; 2009-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Moller → Otay Valley Rock, LLC; 2009-05-01 to 2010-12-29; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → Chula Vista Quarry; 2010-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2010-12-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2010-12-30 to 2007-11-15; source msha-controller-operator-history