# Relationship history for MSHA mine 2601720

Current hierarchy: **Golden Reed Mining & Development Company → Golden Reed Mining & Development Company → Park Canyon 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

- **operator_operates_mine:** Golden Reed Mining & Development Company → Park Canyon Mine; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Golden Reed Mining & Development Company → Park Canyon Mine; 1981-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Golden Reed Mining & Development Company → Golden Reed Mining & Development Company; 1981-03-01 to current/open; source msha-controller-operator-history