# Relationship history for MSHA mine 2401478

Current hierarchy: **Datsopoulous Milton & Gary Gallagher → Eldorado Sapphire Mine → Eldorado Sapphire Mine**

- 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:** Eldorado Sapphire Mine → Eldorado Sapphire Mine; 1979-07-01 to 1981-09-01; source msha-controller-operator-history
- **controller_controls_mine:** Datsopoulous Milton & Gary Gallagher → Eldorado Sapphire Mine; 1979-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Datsopoulous Milton & Gary Gallagher → Eldorado Sapphire Mine; 1979-07-01 to 1981-09-01; source msha-controller-operator-history
- **operator_operates_mine:** Eldorado Mining Inc → Eldorado Sapphire Mine; 1981-09-02 to 1990-06-17; source msha-controller-operator-history
- **controller_controls_mine:** Ledford John → Eldorado Sapphire Mine; 1981-09-02 to 1990-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Ledford John → Eldorado Mining Inc; 1981-09-02 to 1990-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Eldorado Sapphire Mine → Eldorado Sapphire Mine; 1990-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Datsopoulous Milton & Gary Gallagher → Eldorado Sapphire Mine; 1990-06-18 to current/open; source msha-controller-operator-history