# Relationship history for MSHA mine 0405042

Current hierarchy: **Vulcan Materials Company → CalMat Co → VALLEY ROCK**

- 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:** Lone Tree Sand & Gravel Inc → VALLEY ROCK; 1989-06-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Kitchen Billy → VALLEY ROCK; 1989-06-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_operator:** Kitchen Billy → Lone Tree Sand & Gravel Inc; 1989-06-01 to 1990-06-26; source msha-controller-operator-history
- **controller_controls_mine:** Eucon Corporation → VALLEY ROCK; 1989-12-15 to 2008-10-05; source msha-controller-operator-history
- **operator_operates_mine:** West Coast Aggregates Inc → VALLEY ROCK; 1990-06-27 to 2014-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Eucon Corporation → West Coast Aggregates Inc; 1990-06-27 to 2008-10-05; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → VALLEY ROCK; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → VALLEY ROCK; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge North America Inc. et al → VALLEY ROCK; 2008-10-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge North America Inc. et al → West Coast Aggregates Inc; 2008-10-06 to 2014-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Richard O DeAtley et al → West Coast Aggregates Inc; 2008-10-06 to 2014-07-29; source msha-controller-operator-history
- **controller_controls_operator:** Neal  DeAtley et al → West Coast Aggregates Inc; 2008-10-06 to 2014-07-29; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → VALLEY ROCK; 2014-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2014-07-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 2014-07-30 to 2007-11-15; source msha-controller-operator-history