# Relationship history for MSHA mine 3503332

Current hierarchy: **Knife River Corporation → Knife River Corporation-Northwest → Cherry Creek Pit**

- 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:** Jefferson State Redi-Mix → Cherry Creek Pit; 1989-04-01 to 2005-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Keith  Hamilton → Cherry Creek Pit; 1989-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith  Hamilton → Jefferson State Redi-Mix; 1989-04-01 to 2005-06-08; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Cherry Creek Pit; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Cherry Creek Pit; 1998-03-05 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → Cherry Creek Pit; 2005-06-09 to 2010-08-17; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Rogue Aggregates Inc; 2005-06-09 to 2010-08-17; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Corporation-Northwest → Cherry Creek Pit; 2010-08-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Corporation-Northwest; 2010-08-18 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Cherry Creek Pit; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Corporation-Northwest; 2023-06-01 to current/open; source msha-controller-operator-history