# Relationship history for MSHA mine 1000562

Current hierarchy: **Kurt  Mc Call → Emerald Creek Garnet Milling Company Inc → Emerald Creek 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

- **operator_operates_mine:** Idaho Garnet Abrasive Company → Emerald Creek Mine; 1950-01-01 to 1979-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Sunshine Mining & Refining Company → Emerald Creek Mine; 1950-01-01 to 1979-08-30; source msha-controller-operator-history
- **controller_controls_operator:** Sunshine Mining & Refining Company → Idaho Garnet Abrasive Company; 1950-01-01 to 1979-08-30; source msha-controller-operator-history
- **controller_controls_mine:** Kurt  Mc Call  et al → Emerald Creek Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Emerald Creek Garnet Milling Company Inc → Emerald Creek Mine; 1979-08-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kurt  Mc Call  et al → Emerald Creek Garnet Milling Company Inc; 1979-08-31 to current/open; source msha-controller-operator-history