# Relationship history for MSHA mine 4801694

Current hierarchy: **Arch Resources Inc → Arch of Wyoming LLC → Elk Mountain 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:** Ashland Inc et al → Elk Mountain Mine; 1950-01-01 to 2006-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Arch of Wyoming LLC → Elk Mountain Mine; 2006-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Arch of Wyoming LLC; 2006-04-05 to 2006-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Elk Mountain Mine; 2006-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Arch of Wyoming LLC; 2006-04-05 to current/open; source msha-controller-operator-history