# Relationship history for MSHA mine 1500048

Current hierarchy: **CRH PLC → Hinkle Contracting Company LLC → Yellow Rock 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:** Kentucky Stone Company → Yellow Rock Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Yellow Rock Quarry; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Kentucky Stone Company; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → Yellow Rock Quarry; 1950-01-01 to 2022-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest Inc → Yellow Rock Quarry; 1988-11-14 to 2003-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Yellow Rock Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest Inc; 1988-11-14 to 2003-07-22; source msha-controller-operator-history
- **operator_operates_mine:** Hinkle Contracting Company LLC → Yellow Rock Quarry; 2003-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Hinkle Contracting Company LLC; 2003-07-23 to 2022-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Yellow Rock Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest Inc; 2007-08-23 to 2003-07-22; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Yellow Rock Quarry; 2022-05-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Hinkle Contracting Company LLC; 2022-05-14 to current/open; source msha-controller-operator-history