# Relationship history for MSHA mine 1001595

Current hierarchy: **Bolz R E → Boise Mining & Milling Inc → Concentrating Mill**

- 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:** Hawley James H Jr → Concentrating Mill; 1982-09-01 to 1988-02-16; source msha-controller-operator-history
- **operator_operates_mine:** Silver Chief Mining Company Inc → Concentrating Mill; 1982-10-01 to 1985-06-17; source msha-controller-operator-history
- **controller_controls_operator:** Hawley James H Jr → Silver Chief Mining Company Inc; 1982-10-01 to 1985-06-17; source msha-controller-operator-history
- **operator_operates_mine:** Boise Mining & Milling Inc → Concentrating Mill; 1985-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bolz R E → Concentrating Mill; 1985-06-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bolz R E → Boise Mining & Milling Inc; 1985-06-18 to current/open; source msha-controller-operator-history