# Relationship history for MSHA mine 4609637

Current hierarchy: **Ramaco Resources Inc → Maben Coal, LLC → Maben Surface**

- 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:** Michael D Bauersachs → Maben Surface; 2012-04-27 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Appleton Coal, LLC → Maben Surface; 2012-06-28 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Ramaco Resources Inc → Maben Surface; 2017-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ramaco Resources, LLC → Maben Surface; 2022-11-01 to 2023-01-15; source msha-controller-operator-history
- **controller_controls_operator:** Michael D Bauersachs → Ramaco Resources, LLC; 2022-11-01 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ramaco Resources Inc → Ramaco Resources, LLC; 2022-11-01 to 2023-01-15; source msha-controller-operator-history
- **controller_controls_mine:** Ramaco Resources Inc → Maben Surface; 2022-11-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Maben Coal, LLC → Maben Surface; 2023-01-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Appleton Coal, LLC → Maben Coal, LLC; 2023-01-16 to 2022-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Ramaco Resources Inc → Maben Coal, LLC; 2023-01-16 to current/open; source msha-controller-operator-history