# Relationship history for MSHA mine 0400089

Current hierarchy: **Vulcan Materials Company → Superior Ready Mix Concrete L P → MISSION GORGE PLANT**

- 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:** Canyon Rock Company → MISSION GORGE PLANT; 1950-01-01 to 1991-07-07; source msha-controller-operator-history
- **controller_controls_mine:** J Gary  Dennis  et al → MISSION GORGE PLANT; 1950-01-01 to 1991-07-07; source msha-controller-operator-history
- **controller_controls_operator:** J Gary  Dennis  et al → Canyon Rock Company; 1950-01-01 to 1991-07-07; source msha-controller-operator-history
- **controller_controls_mine:** J Brouwer Investments Inc Et Al → MISSION GORGE PLANT; 1979-09-01 to 2025-04-27; source msha-controller-operator-history
- **operator_operates_mine:** Superior Ready Mix Concrete L P → MISSION GORGE PLANT; 1991-07-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** J Brouwer Investments Inc Et Al → Superior Ready Mix Concrete L P; 1991-07-08 to 2025-04-27; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → MISSION GORGE PLANT; 2025-04-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Superior Ready Mix Concrete L P; 2025-04-28 to current/open; source msha-controller-operator-history