# Relationship history for MSHA mine 2901887

Current hierarchy: **Holliday Ira → Mina Amigos Mining Company → Spanish Gold**

- 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

- **controller_controls_mine:** Holliday Ira → Spanish Gold; 1980-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mina Amigos Mining Company → Spanish Gold; 1982-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holliday Ira → Mina Amigos Mining Company; 1982-09-01 to current/open; source msha-controller-operator-history