# Relationship history for MSHA mine 2901360

Current hierarchy: **Mc Cauley Tom → Mc Cauley Mining Company → Great Eagle**

- 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:** Frontier Metals Corp → Great Eagle; 1950-01-01 to 1978-02-02; source msha-controller-operator-history
- **controller_controls_mine:** Frontier Metals Corp → Great Eagle; 1950-01-01 to 1978-02-02; source msha-controller-operator-history
- **controller_controls_operator:** Frontier Metals Corp → Frontier Metals Corp; 1950-01-01 to 1978-02-02; source msha-controller-operator-history
- **operator_operates_mine:** Mc Cauley Mining Company → Great Eagle; 1978-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Cauley Tom → Great Eagle; 1978-02-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mc Cauley Tom → Mc Cauley Mining Company; 1978-02-03 to current/open; source msha-controller-operator-history