# Relationship history for MSHA mine 4801820

Current hierarchy: **Navajo Transitional Energy Company LLC → Navajo Transitional Energy Company, LLC → Youngs Creek Mine**

- 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:** Navajo Nation → Youngs Creek Mine; 2013-12-31 to 2019-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Youngs Creek Mining Company, LLC → Youngs Creek Mine; 2018-10-25 to 2019-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Cloud Peak Energy Resources LLC → Youngs Creek Mine; 2018-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cloud Peak Energy Resources LLC → Youngs Creek Mining Company, LLC; 2018-10-25 to 2019-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Navajo Transitional Energy Company, LLC → Youngs Creek Mine; 2019-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Navajo Nation → Navajo Transitional Energy Company, LLC; 2019-10-25 to 2019-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Navajo Transitional Energy Company LLC → Youngs Creek Mine; 2019-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Navajo Transitional Energy Company LLC → Navajo Transitional Energy Company, LLC; 2019-10-25 to current/open; source msha-controller-operator-history