# Relationship history for MSHA mine 4407288

Current hierarchy: **Daniel W  Bunn → Mega Highwall Mining, LLC → SHM System-77**

- 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:** Omega Highwall Mining, LLC → SHM System-77; 2011-08-24 to 2018-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Omega Holdings LLC → SHM System-77; 2011-08-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Omega Holdings LLC → Omega Highwall Mining, LLC; 2011-08-24 to 2018-08-02; source msha-controller-operator-history
- **controller_controls_mine:** Michael D Bauersachs → SHM System-77; 2016-07-01 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Ramaco Resources Inc → SHM System-77; 2017-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Daniel W  Bunn → SHM System-77; 2017-03-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Omega Surface Mining, LLC → SHM System-77; 2018-08-03 to 2020-08-04; source msha-controller-operator-history
- **controller_controls_operator:** Omega Holdings LLC → Omega Surface Mining, LLC; 2018-08-03 to 2020-08-04; source msha-controller-operator-history
- **operator_operates_mine:** Ramaco Resources Land Holdings, LLC → SHM System-77; 2020-08-05 to 2024-02-29; source msha-controller-operator-history
- **controller_controls_operator:** Michael D Bauersachs → Ramaco Resources Land Holdings, LLC; 2020-08-05 to 2016-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Ramaco Resources Inc → Ramaco Resources Land Holdings, LLC; 2020-08-05 to 2024-02-29; source msha-controller-operator-history
- **operator_operates_mine:** Mega Highwall Mining, LLC → SHM System-77; 2024-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Daniel W  Bunn → Mega Highwall Mining, LLC; 2024-03-01 to current/open; source msha-controller-operator-history