# Relationship history for MSHA mine 0202156

Current hierarchy: **Burckhalter Hoyt & H G Pruett → Alpha Gold Ltd → Hackberry**

- 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:** Alpha Gold Ltd → Hackberry; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Burckhalter Hoyt & H G Pruett → Hackberry; 1983-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Burckhalter Hoyt & H G Pruett → Alpha Gold Ltd; 1983-06-01 to current/open; source msha-controller-operator-history