# Relationship history for MSHA mine 1518907

Current hierarchy: **Jamie  Sawyers → Hi-Energy Coal LLC → Hi-Energy Coal LLC Mine #1**

- 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

- **operator_operates_mine:** Hi-Energy Coal LLC → Hi-Energy Coal LLC Mine #1; 2005-07-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ramey Tim → Hi-Energy Coal LLC Mine #1; 2005-07-28 to 2006-07-24; source msha-controller-operator-history
- **controller_controls_operator:** Ramey Tim → Hi-Energy Coal LLC; 2005-07-28 to 2006-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Jamie  Sawyers → Hi-Energy Coal LLC Mine #1; 2006-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jamie  Sawyers → Hi-Energy Coal LLC; 2006-07-25 to current/open; source msha-controller-operator-history