# Relationship history for MSHA mine 3500965

Current hierarchy: **Heidelberg Materials AG → HM Pacific Northwest Inc. → Coyote Springs Sand & Gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Ready Mix Sand & Gravel Company Inc → Coyote Springs Sand & Gravel; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_mine:** John P  O'Reilly → Coyote Springs Sand & Gravel; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **controller_controls_operator:** John P  O'Reilly → Ready Mix Sand & Gravel Company Inc; 1950-01-01 to 1992-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Coyote Springs Sand & Gravel → Coyote Springs Sand & Gravel; 1992-04-20 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_mine:** E O S Inc Et Al → Coyote Springs Sand & Gravel; 1992-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** E O S Inc Et Al → Coyote Springs Sand & Gravel; 1992-04-20 to 2003-08-03; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Coyote Springs Sand & Gravel; 2002-09-26 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Rinker Group Ltd → Coyote Springs Sand & Gravel; 2003-04-01 to 2007-07-09; source msha-controller-operator-history
- **operator_operates_mine:** Pacific Rock Products, LLC → Coyote Springs Sand & Gravel; 2003-08-04 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rinker Group Ltd → Pacific Rock Products, LLC; 2003-08-04 to 2007-07-09; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Pacific Rock Products, LLC; 2003-08-04 to 2003-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Cemex S A → Coyote Springs Sand & Gravel; 2007-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cemex S A → Pacific Rock Products, LLC; 2007-07-10 to 2017-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Coyote Springs Sand & Gravel; 2017-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** HM Pacific Northwest Inc. → Coyote Springs Sand & Gravel; 2017-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → HM Pacific Northwest Inc.; 2017-07-01 to current/open; source msha-controller-operator-history