# Relationship history for MSHA mine 4500783

Current hierarchy: **Newmont Corporation → Dawn Mining Company → Midnite 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: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Dawn Mining Company → Midnite Mine; 1950-01-01 to 1979-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Newmont Corporation → Midnite Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newmont Corporation → Dawn Mining Company; 1950-01-01 to 1979-06-13; source msha-controller-operator-history
- **controller_controls_mine:** N A Degerstrom → Midnite Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** N A Degerstrom Inc → Midnite Mine; 1979-06-14 to 1980-09-08; source msha-controller-operator-history
- **controller_controls_operator:** N A Degerstrom → N A Degerstrom Inc; 1979-06-14 to 1980-09-08; source msha-controller-operator-history
- **operator_operates_mine:** Dawn Mining Company → Midnite Mine; 1980-09-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Newmont Corporation → Dawn Mining Company; 1980-09-09 to current/open; source msha-controller-operator-history