# Relationship history for MSHA mine 1511523

Current hierarchy: **Quintana Minerals Corp → Bevins Branch Mining Inc → No 1**

- 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:** Bevins Branch Mining Inc → No 1; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Blackburn Clifton → No 1; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Clifton → Bevins Branch Mining Inc; 1978-09-01 to 1980-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Bevins Branch Mining Inc → No 1; 1980-02-01 to 1984-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Blackburn Wesley → No 1; 1980-02-01 to 1984-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Blackburn Wesley → Bevins Branch Mining Inc; 1980-02-01 to 1984-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Bevins Branch Mining Inc → No 1; 1984-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Quintana Minerals Corp → No 1; 1984-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quintana Minerals Corp → Bevins Branch Mining Inc; 1984-05-29 to current/open; source msha-controller-operator-history