# Relationship history for MSHA mine 1518865

Current hierarchy: **Jamie  Sawyers → Hi-Energy Coal LLC → No. 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Mark G  Altizer → No. 1; 1998-06-30 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Highwall Mining Company of Virginia Inc → No. 1; 2005-04-19 to 2005-11-03; source msha-controller-operator-history
- **controller_controls_operator:** Mark G  Altizer → Highwall Mining Company of Virginia Inc; 2005-04-19 to 2005-11-03; source msha-controller-operator-history
- **controller_controls_mine:** Ramey Tim → No. 1; 2005-07-28 to 2006-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Hi-Energy Coal LLC → No. 1; 2005-11-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ramey Tim → Hi-Energy Coal LLC; 2005-11-04 to 2006-07-24; source msha-controller-operator-history
- **controller_controls_mine:** Jamie  Sawyers → No. 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