# Relationship history for MSHA mine 2601886

Current hierarchy: **Hycroft Mining Corporation → Hycroft Lewis Mine Inc → Lewis 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Standard Slag Company → Lewis Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Standard Slag Company → Lewis Mine; 1984-04-01 to 1987-01-22; source msha-controller-operator-history
- **controller_controls_operator:** Standard Slag Company → Standard Slag Company; 1984-04-01 to 1987-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Hycroft Lewis Mine Inc → Lewis Mine; 1987-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hycroft Mining Corporation → Lewis Mine; 1987-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hycroft Mining Corporation → Hycroft Lewis Mine Inc; 1987-01-23 to current/open; source msha-controller-operator-history