# Relationship history for MSHA mine 0503866

Current hierarchy: **Quasar Mine Services Corp (Usa) → Quasar Mine Services Corp (Usa) → Union #5**

- 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:** Regulus Resources Inc → Union #5; 1983-06-01 to 1983-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Bieber Ronald → Union #5; 1983-06-01 to 1983-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Bieber Ronald → Regulus Resources Inc; 1983-06-01 to 1983-08-30; source msha-controller-operator-history
- **operator_operates_mine:** Quasar Mine Services Corp (Usa) → Union #5; 1983-08-31 to 1984-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Quasar Mine Services Corp (Usa) → Union #5; 1983-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quasar Mine Services Corp (Usa) → Quasar Mine Services Corp (Usa); 1983-08-31 to 1984-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Bema Industries (Us) Inc → Union #5; 1984-07-19 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Bema Gold Corp → Union #5; 1984-07-19 to 1985-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Bema Gold Corp → Bema Industries (Us) Inc; 1984-07-19 to 1985-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Quasar Mine Services Corp (Usa) → Union #5; 1985-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quasar Mine Services Corp (Usa) → Quasar Mine Services Corp (Usa); 1985-07-17 to current/open; source msha-controller-operator-history