# Relationship history for MSHA mine 1519182

Current hierarchy: **HBM Holdings Company → MLC → MLC - Verona**

- 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:** Margaret J  Heckman  et al → MLC - Verona; 1950-01-01 to 2022-09-06; source msha-controller-operator-history
- **operator_operates_mine:** Gallatin Materials LLC → MLC - Verona; 2008-02-19 to 2008-09-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → MLC - Verona; 2008-02-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Gallatin Materials LLC; 2008-02-19 to 2008-09-25; source msha-controller-operator-history
- **operator_operates_mine:** MLC → MLC - Verona; 2008-09-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Margaret J  Heckman  et al → MLC; 2008-09-26 to 2022-09-06; source msha-controller-operator-history
- **controller_controls_mine:** HBM Holdings Company → MLC - Verona; 2022-09-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** HBM Holdings Company → MLC; 2022-09-07 to current/open; source msha-controller-operator-history