# Relationship history for MSHA mine 4801800

Current hierarchy: **Knife River Corporation → JTL Group, Inc. → Burnett 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

- **controller_controls_mine:** MDU Resources Group Inc → Burnett Pit; 1999-09-01 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Knife River → Burnett Pit; 2016-05-26 to 2021-02-15; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River; 2016-05-26 to 2021-02-15; source msha-controller-operator-history
- **operator_operates_mine:** JTL Group, Inc. → Burnett Pit; 2021-02-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → JTL Group, Inc.; 2021-02-16 to 2023-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → Burnett Pit; 2023-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River; 2023-06-01 to 2021-02-15; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → JTL Group, Inc.; 2023-06-01 to current/open; source msha-controller-operator-history