# Relationship history for MSHA mine 2601525

Current hierarchy: **Spitler Robert → Diamond Treasure Hill Inc → Diamond - Silverado**

- 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:** Diamond-Silverado Exploration Inc → Diamond - Silverado; 1979-01-01 to 1980-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Erickson Einar C → Diamond - Silverado; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Erickson Einar C → Diamond-Silverado Exploration Inc; 1979-01-01 to 1980-06-22; source msha-controller-operator-history
- **operator_operates_mine:** Diamond Treasure Hill Inc → Diamond - Silverado; 1980-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Spitler Robert → Diamond - Silverado; 1980-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Spitler Robert → Diamond Treasure Hill Inc; 1980-06-23 to current/open; source msha-controller-operator-history