# Relationship history for MSHA mine 5001546

Current hierarchy: **Kristen D.  Kolden; Parker R.  Schnabel → HiEx Construction Inc. → HiEx Hard Rock**

- 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:** Northern Timber Corp → HiEx Hard Rock; 1988-05-01 to 2024-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Northern Timber Corp → HiEx Hard Rock; 1988-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Northern Timber Corp → Northern Timber Corp; 1988-05-01 to 2024-08-22; source msha-controller-operator-history
- **operator_operates_mine:** HiEx Construction Inc. → HiEx Hard Rock; 2024-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Parker R.  Schnabel et al → HiEx Hard Rock; 2024-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Parker R.  Schnabel et al → HiEx Construction Inc.; 2024-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kristen D.  Kolden et al → HiEx Construction Inc.; 2024-08-28 to current/open; source msha-controller-operator-history