# Relationship history for MSHA mine 3800693

Current hierarchy: **Heidelberg Materials AG → Giant Cement Company → Washie Road Sand Mine**

- 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

- **operator_operates_mine:** Giant Cement Company → Washie Road Sand Mine; 1999-10-01 to 1999-12-09; source msha-controller-operator-history
- **controller_controls_mine:** Giant Cement Holding Inc → Washie Road Sand Mine; 1999-10-01 to 1999-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Giant Cement Holding Inc → Giant Cement Company; 1999-10-01 to 1999-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Giant Cement Company → Washie Road Sand Mine; 1999-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cementos Portland Valderrivas S A → Washie Road Sand Mine; 1999-12-10 to 2016-10-25; source msha-controller-operator-history
- **controller_controls_operator:** Cementos Portland Valderrivas S A → Giant Cement Company; 1999-12-10 to 2016-10-25; source msha-controller-operator-history
- **controller_controls_mine:** Elementia Materiales → Washie Road Sand Mine; 2016-10-26 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_operator:** Elementia Materiales → Giant Cement Company; 2016-10-26 to 2025-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Washie Road Sand Mine; 2025-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Giant Cement Company; 2025-04-01 to current/open; source msha-controller-operator-history