# Relationship history for MSHA mine 4000168

Current hierarchy: **Korea Zinc Co Ltd → Crucible ETN LLC → Young 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

- **operator_operates_mine:** Asarco Inc → Young Mine; 1950-01-01 to 1999-11-16; source msha-controller-operator-history
- **controller_controls_mine:** Asarco Inc → Young Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Asarco Inc → Asarco Inc; 1950-01-01 to 1999-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Asarco Inc → Young Mine; 1999-11-17 to 2006-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Grupo Mexico S A B de C V → Young Mine; 1999-11-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Grupo Mexico S A B de C V → Asarco Inc; 1999-11-17 to 2006-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Nyrstar Tennessee Mines, Strawberry Plains LLC → Young Mine; 2006-06-09 to 2026-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Tennessee Zinc Company LLC → Young Mine; 2006-06-09 to 2009-12-06; source msha-controller-operator-history
- **controller_controls_operator:** Tennessee Zinc Company LLC → Nyrstar Tennessee Mines, Strawberry Plains LLC; 2006-06-09 to 2009-12-06; source msha-controller-operator-history
- **controller_controls_mine:** Nyrstar NV → Young Mine; 2009-12-07 to 2022-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Nyrstar NV → Nyrstar Tennessee Mines, Strawberry Plains LLC; 2009-12-07 to 2022-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Nyrstar US Inc → Young Mine; 2022-10-01 to 2024-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Nyrstar US Inc → Nyrstar Tennessee Mines, Strawberry Plains LLC; 2022-10-01 to 2024-10-23; source msha-controller-operator-history
- **controller_controls_mine:** Nyrstar Netherlands Holdings B.V. → Young Mine; 2024-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nyrstar Netherlands Holdings B.V. → Nyrstar Tennessee Mines, Strawberry Plains LLC; 2024-10-24 to 2026-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Crucible ETN LLC → Young Mine; 2026-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Korea Zinc Co Ltd → Young Mine; 2026-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Korea Zinc Co Ltd → Crucible ETN LLC; 2026-04-21 to current/open; source msha-controller-operator-history