# Relationship history for MSHA mine 0405951

Current hierarchy: **Sierra Resources, LLC; Elli M Mills → Sierra Minerals, LLC → Colombo 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:** Sierra Minerals, LLC → Colombo Mine; 2021-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sierra Resources, LLC et al → Colombo Mine; 2021-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sierra Resources, LLC et al → Sierra Minerals, LLC; 2021-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Elli M Mills et al → Sierra Minerals, LLC; 2021-01-10 to current/open; source msha-controller-operator-history