# Relationship history for MSHA mine 2601782

Current hierarchy: **Park Canyon Mining & Development Co Inc → Park Canyon Mining & Development Co Inc → Contact 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:** Park Canyon Mining & Development Co Inc → Contact Mine; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Park Canyon Mining & Development Co Inc → Contact Mine; 1981-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Park Canyon Mining & Development Co Inc → Park Canyon Mining & Development Co Inc; 1981-12-01 to current/open; source msha-controller-operator-history