# Relationship history for MSHA mine 3609180

Current hierarchy: **Severstal Resources → Elk Lick Energy, Inc. → Kaltenbaugh Job**

- 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:** Elk Lick Energy, Inc. → Kaltenbaugh Job; 2004-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Severstal Resources → Kaltenbaugh Job; 2004-09-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Severstal Resources → Elk Lick Energy, Inc.; 2004-09-13 to current/open; source msha-controller-operator-history