# Relationship history for MSHA mine 0500437

Current hierarchy: **Royal Gold Inc → Royal Camp Bird Inc → Camp Bird 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:** Camp Bird Colorado Inc → Camp Bird Mine; 1950-01-01 to 1986-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Federal Resources Corp → Camp Bird Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Federal Resources Corp → Camp Bird Colorado Inc; 1950-01-01 to 1986-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Camp Bird Venture → Camp Bird Mine; 1986-08-15 to 1989-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Royal Gold Inc & Chipeta Corp → Camp Bird Mine; 1986-08-15 to 1989-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Royal Gold Inc & Chipeta Corp → Camp Bird Venture; 1986-08-15 to 1989-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Royal Camp Bird Inc → Camp Bird Mine; 1989-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Royal Gold Inc → Camp Bird Mine; 1989-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Royal Gold Inc → Royal Camp Bird Inc; 1989-10-23 to current/open; source msha-controller-operator-history