# Relationship history for MSHA mine 0202676

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Of Arizona Inc → FLORENCE PLANT #43**

- 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

- **controller_controls_mine:** Gary  Schnurr → FLORENCE PLANT #43; 1950-01-01 to 2014-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Sand Company → FLORENCE PLANT #43; 1996-10-01 to 1999-12-29; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Schnurr → Pioneer Sand Company; 1996-10-01 to 1999-12-29; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → FLORENCE PLANT #43; 1997-09-01 to 2000-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Concrete Of Arizona Inc → FLORENCE PLANT #43; 1999-12-30 to 2000-08-03; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer Concrete Of Arizona Inc; 1999-12-30 to 2000-08-03; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Of Arizona Inc → FLORENCE PLANT #43; 2000-08-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → FLORENCE PLANT #43; 2000-08-04 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Of Arizona Inc; 2000-08-04 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → FLORENCE PLANT #43; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Of Arizona Inc; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** JLL Partners Incorporated → FLORENCE PLANT #43; 2015-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** JLL Partners Incorporated → Pioneer Sand Company; 2015-01-01 to 1999-12-29; source msha-controller-operator-history