# Relationship history for MSHA mine 0901033

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC → Sparta 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:** Hancock Aggregate Corp → Sparta Quarry; 1988-09-01 to 1991-04-17; source msha-controller-operator-history
- **controller_controls_mine:** W S  Bumgarner → Sparta Quarry; 1988-09-01 to 1991-04-17; source msha-controller-operator-history
- **controller_controls_operator:** W S  Bumgarner → Hancock Aggregate Corp; 1988-09-01 to 1991-04-17; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Sparta Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hancock County Materials → Sparta Quarry; 1991-04-18 to 1994-07-26; source msha-controller-operator-history
- **controller_controls_mine:** Holloway Materials Inc → Sparta Quarry; 1991-04-18 to 1994-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Holloway Materials Inc → Hancock County Materials; 1991-04-18 to 1994-07-26; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southeast Agg., LLC → Sparta Quarry; 1994-07-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Southeast Agg., LLC; 1994-07-27 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Sparta Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC; 2007-08-23 to current/open; source msha-controller-operator-history