# Relationship history for MSHA mine 1700979

Current hierarchy: **Jon A  Stevens → Spectrum Resources International, LLC → Midway Pit and Plant**

- 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:** Spectrum Resources International, LLC → Midway Pit and Plant; 2015-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jon A  Stevens → Midway Pit and Plant; 2015-12-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jon A  Stevens → Spectrum Resources International, LLC; 2015-12-08 to current/open; source msha-controller-operator-history