# Relationship history for MSHA mine 2301628

Current hierarchy: **Riverstone Group → Central Stone Company → ST Francois Quarry (CS54)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Riverstone Group → ST Francois Quarry (CS54); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coffelt Limestone Company → ST Francois Quarry (CS54); 1950-01-01 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Dewey  Coffelt → ST Francois Quarry (CS54); 1950-01-01 to 1984-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Dewey  Coffelt → Coffelt Limestone Company; 1950-01-01 to 1984-12-31; source msha-controller-operator-history
- **operator_operates_mine:** St Francois County Stone → ST Francois Quarry (CS54); 1985-01-01 to 1988-01-31; source msha-controller-operator-history
- **controller_controls_mine:** John W  Hurst → ST Francois Quarry (CS54); 1985-01-01 to 1988-01-31; source msha-controller-operator-history
- **controller_controls_operator:** John W  Hurst → St Francois County Stone; 1985-01-01 to 1988-01-31; source msha-controller-operator-history
- **controller_controls_mine:** John H Berra Construction Co → ST Francois Quarry (CS54); 1987-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** St Francois County Stone → ST Francois Quarry (CS54); 1988-02-01 to 1990-05-13; source msha-controller-operator-history
- **controller_controls_mine:** Mary Ellen  (Hurst) Carr → ST Francois Quarry (CS54); 1988-02-01 to 1990-05-13; source msha-controller-operator-history
- **controller_controls_operator:** Mary Ellen  (Hurst) Carr → St Francois County Stone; 1988-02-01 to 1990-05-13; source msha-controller-operator-history
- **operator_operates_mine:** Bellefontaine Quarry Inc → ST Francois Quarry (CS54); 1990-05-14 to 2001-11-04; source msha-controller-operator-history
- **controller_controls_operator:** John H Berra Construction Co → Bellefontaine Quarry Inc; 1990-05-14 to 2001-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → ST Francois Quarry (CS54); 2001-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 2001-11-05 to current/open; source msha-controller-operator-history