# Relationship history for MSHA mine 1000502

Current hierarchy: **Costea Albert → Goldback Mines Corp → Goldback Mill**

- 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

- **controller_controls_mine:** Costea Albert → Goldback Mill; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lyons Gordon → Goldback Mill; 1978-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Silver Baron Mining Company → Goldback Mill; 1979-09-01 to 1982-08-16; source msha-controller-operator-history
- **controller_controls_operator:** Lyons Gordon → Silver Baron Mining Company; 1979-09-01 to 1982-08-16; source msha-controller-operator-history
- **operator_operates_mine:** Goldback Mines Corp → Goldback Mill; 1982-08-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costea Albert → Goldback Mines Corp; 1982-08-17 to current/open; source msha-controller-operator-history