# Relationship history for MSHA mine 0202681

Current hierarchy: **Howard  Libby; Rick  Barnas → Buckeye Sand & Gravel → Buckeye Sand & Gravel**

- 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

- **operator_operates_mine:** Alleco Stone Llc → Buckeye Sand & Gravel; 1997-01-01 to 2003-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Tom  Mattingly → Buckeye Sand & Gravel; 1997-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tom  Mattingly → Alleco Stone Llc; 1997-01-01 to 2003-12-14; source msha-controller-operator-history
- **operator_operates_mine:** Buckeye Sand & Gravel → Buckeye Sand & Gravel; 2003-12-15 to 2005-09-09; source msha-controller-operator-history
- **controller_controls_mine:** Jason  Libby → Buckeye Sand & Gravel; 2003-12-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason  Libby → Buckeye Sand & Gravel; 2003-12-15 to 2005-09-09; source msha-controller-operator-history
- **operator_operates_mine:** Buckeye Sand & Gravel → Buckeye Sand & Gravel; 2005-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Howard  Libby  et al → Buckeye Sand & Gravel; 2005-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Howard  Libby  et al → Buckeye Sand & Gravel; 2005-09-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Barnas  et al → Buckeye Sand & Gravel; 2005-09-10 to current/open; source msha-controller-operator-history