# Relationship history for MSHA mine 2602057

Current hierarchy: **Bennett Norman L → Vulcan Mining & Development Company → Gold Bug 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

- **controller_controls_mine:** Bennett Norman L → Gold Bug Mine; 1987-05-13 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Mining & Development Company → Gold Bug Mine; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennett Norman L → Vulcan Mining & Development Company; 1988-05-01 to current/open; source msha-controller-operator-history