# Relationship history for MSHA mine 4609681

Current hierarchy: **Ramaco Resources Inc → Maben Coal, LLC → Beckley Crystal 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Appleton Coal, LLC → Beckley Crystal Mine; 2012-06-28 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Ramaco Resources Inc → Beckley Crystal Mine; 2022-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maben Coal, LLC → Beckley Crystal Mine; 2026-03-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Appleton Coal, LLC → Maben Coal, LLC; 2026-03-19 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Ramaco Resources Inc → Maben Coal, LLC; 2026-03-19 to current/open; source msha-controller-operator-history