# Relationship history for MSHA mine 3301466

Current hierarchy: **James P  Jurgensen II; Jacqueline J  Alf; Jason R  Jurgensen → Enon Sand & Gravel LLC → Enon 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:** Hilltop Basic Resources Inc → Enon Sand & Gravel; 1950-01-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John F  Steele Jr → Enon Sand & Gravel; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John F  Steele Jr → Hilltop Basic Resources Inc; 1950-01-01 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Enon Sand & Gravel LLC → Enon Sand & Gravel; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** James P  Jurgensen → Enon Sand & Gravel; 2004-01-01 to 2018-10-16; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen → Enon Sand & Gravel LLC; 2004-01-01 to 2018-10-16; source msha-controller-operator-history
- **controller_controls_mine:** James P  Jurgensen II et al → Enon Sand & Gravel; 2018-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen II et al → Enon Sand & Gravel LLC; 2018-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jason R  Jurgensen et al → Enon Sand & Gravel LLC; 2018-10-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jacqueline J  Alf et al → Enon Sand & Gravel LLC; 2018-10-17 to current/open; source msha-controller-operator-history