# Relationship history for MSHA mine 3304457

Current hierarchy: **James P  Jurgensen II; Jacqueline J  Alf; Jason R  Jurgensen → Enon Sand & Gravel LLC → Springfield Plant**

- 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:** Upper Valley Resources → Springfield Plant; 2000-04-01 to 2005-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Brett C  Baisden → Springfield Plant; 2000-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brett C  Baisden → Upper Valley Resources; 2000-04-01 to 2005-06-16; source msha-controller-operator-history
- **controller_controls_mine:** James P  Jurgensen → Springfield Plant; 2004-01-01 to 2018-10-16; source msha-controller-operator-history
- **operator_operates_mine:** Yellow Springs Aggregates, llc → Springfield Plant; 2005-06-17 to 2008-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Geoff C Harris et al → Springfield Plant; 2005-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Geoff C Harris et al → Yellow Springs Aggregates, llc; 2005-08-17 to 2008-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Johnson et al → Yellow Springs Aggregates, llc; 2005-08-17 to 2008-03-06; source msha-controller-operator-history
- **operator_operates_mine:** Enon Sand & Gravel LLC → Springfield Plant; 2008-03-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James P  Jurgensen → Enon Sand & Gravel LLC; 2008-03-07 to 2018-10-16; source msha-controller-operator-history
- **controller_controls_mine:** Jacqueline J  Alf et al → Springfield Plant; 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
- **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