# Relationship history for MSHA mine 2401450

Current hierarchy: **Donald G  Sutton → Spectrum Engineering Inc → ZORTMAN MINING INC**

- 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:** Zortman Mining Inc → ZORTMAN MINING INC; 1979-11-01 to 1999-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Apollo Gold Corporation → ZORTMAN MINING INC; 1979-11-01 to 1999-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Apollo Gold Corporation → Zortman Mining Inc; 1979-11-01 to 1999-07-15; source msha-controller-operator-history
- **operator_operates_mine:** Spectrum Engineering Inc → ZORTMAN MINING INC; 1999-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Donald G  Sutton et al → ZORTMAN MINING INC; 1999-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Donald G  Sutton et al → Spectrum Engineering Inc; 1999-07-16 to current/open; source msha-controller-operator-history