# Relationship history for MSHA mine 2602522

Current hierarchy: **Tutor-Saliba Corp → TPC Aggregates Jean Quarry → TPC Aggregates Jean Quarry**

- 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:** Big Iron Enterprises Inc → TPC Aggregates Jean Quarry; 2003-06-01 to 2004-10-17; source msha-controller-operator-history
- **controller_controls_mine:** Mike L  Skorka → TPC Aggregates Jean Quarry; 2003-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike L  Skorka → Big Iron Enterprises Inc; 2003-06-01 to 2004-10-17; source msha-controller-operator-history
- **operator_operates_mine:** Horizon Sand Products → TPC Aggregates Jean Quarry; 2004-10-18 to 2005-10-08; source msha-controller-operator-history
- **controller_controls_mine:** Corwon  Finley → TPC Aggregates Jean Quarry; 2004-10-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Corwon  Finley → Horizon Sand Products; 2004-10-18 to 2005-10-08; source msha-controller-operator-history
- **operator_operates_mine:** All Star Aggregates Inc → TPC Aggregates Jean Quarry; 2005-10-09 to 2008-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Galen  Stockton  et al → TPC Aggregates Jean Quarry; 2005-10-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Galen  Stockton  et al → All Star Aggregates Inc; 2005-10-09 to 2008-09-25; source msha-controller-operator-history
- **controller_controls_operator:** Enis  Jordan  et al → All Star Aggregates Inc; 2005-10-09 to 2008-09-25; source msha-controller-operator-history
- **operator_operates_mine:** TPC Aggregates Jean Quarry → TPC Aggregates Jean Quarry; 2008-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tutor-Saliba Corp → TPC Aggregates Jean Quarry; 2008-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tutor-Saliba Corp → TPC Aggregates Jean Quarry; 2008-09-26 to current/open; source msha-controller-operator-history