# Relationship history for MSHA mine 2301770

Current hierarchy: **Missouri Cobalt Holdings LLC → US Strategic Metals → Madison 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:** Anschutz Mining Corp → Madison Mine; 1979-01-01 to 2019-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Anschutz Corp → Madison Mine; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anschutz Corp → Anschutz Mining Corp; 1979-01-01 to 2019-04-23; source msha-controller-operator-history
- **operator_operates_mine:** US Strategic Metals → Madison Mine; 2019-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Missouri Cobalt Holdings LLC → Madison Mine; 2019-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Missouri Cobalt Holdings LLC → US Strategic Metals; 2019-04-24 to current/open; source msha-controller-operator-history