# Relationship history for MSHA mine 1518248

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Sidney Coal Company, Inc. → Alma #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:** Massey Energy Company → Alma #1; 1984-10-04 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Pittston Company → Alma #1; 1994-01-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Addington Inc → Alma #1; 2000-03-01 to 2002-07-21; source msha-controller-operator-history
- **controller_controls_operator:** Pittston Company → Addington Inc; 2000-03-01 to 2002-07-21; source msha-controller-operator-history
- **operator_operates_mine:** Sidney Coal Company, Inc. → Alma #1; 2002-07-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Sidney Coal Company, Inc.; 2002-07-22 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Alma #1; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Sidney Coal Company, Inc.; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Alma #1; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Sidney Coal Company, Inc.; 2016-07-26 to current/open; source msha-controller-operator-history