# Relationship history for MSHA mine 2402110

Current hierarchy: **Knife River Corporation → Knife River → River Pit Wash 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Wilken Gary → River Pit Wash Plant; 1950-01-01 to 2003-04-13; source msha-controller-operator-history
- **operator_operates_mine:** Mc Elroy & Wilken, Inc. → River Pit Wash Plant; 1997-06-01 to 2007-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Wilken Gary → Mc Elroy & Wilken, Inc.; 1997-06-01 to 2003-04-13; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → River Pit Wash Plant; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → River Pit Wash Plant; 2003-04-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Mc Elroy & Wilken, Inc.; 2003-04-14 to 2007-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Knife River → River Pit Wash Plant; 2007-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River; 2007-04-30 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → River Pit Wash Plant; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River; 2023-06-01 to current/open; source msha-controller-operator-history