# Relationship history for MSHA mine 3800310

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southeast Agg., LLC → Sandy Flat 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:** Sloan Construction Company Inc → Sandy Flat Quarry; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** E D  Sloan Jr → Sandy Flat Quarry; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_operator:** E D  Sloan Jr → Sloan Construction Company Inc; 1950-01-01 to 1979-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Clement Brothers Company → Sandy Flat Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Sandy Flat Quarry; 1979-02-01 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Materials Inc → Sandy Flat Quarry; 1979-04-01 to 1981-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Clement Brothers Company → Interstate Materials Inc; 1979-04-01 to 1981-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Interstate Materials Company → Sandy Flat Quarry; 1981-10-15 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_mine:** Rmc Group PLC et al → Sandy Flat Quarry; 1981-10-15 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_operator:** Rmc Group PLC et al → Interstate Materials Company; 1981-10-15 to 1984-01-11; source msha-controller-operator-history
- **controller_controls_mine:** CSR Ltd → Sandy Flat Quarry; 1982-10-27 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Aggregates Company → Sandy Flat Quarry; 1984-01-12 to 1985-03-12; source msha-controller-operator-history
- **controller_controls_operator:** CSR Ltd → Southern Aggregates Company; 1984-01-12 to 1985-03-12; source msha-controller-operator-history
- **operator_operates_mine:** Davidson Mineral Properties Inc → Sandy Flat Quarry; 1985-03-13 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Davidson Mineral Properties Inc; 1985-03-13 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Sandy Flat Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates East Inc → Sandy Flat Quarry; 1988-11-14 to 2001-09-12; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Sandy Flat Quarry; 1988-11-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates East Inc; 1988-11-14 to 2001-09-12; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southeast Agg., LLC → Sandy Flat Quarry; 2001-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Southeast Agg., LLC; 2001-09-13 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Sandy Flat 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