# Relationship history for MSHA mine 1517321

Current hierarchy: **Alpha Natural Resources Holdings, Inc → Long Fork Coal Company → Long Fork Coal Company Fireclay #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

- **controller_controls_mine:** Massey Energy Company → Long Fork Coal Company Fireclay #1; 1992-03-26 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Long Fork Coal Company → Long Fork Coal Company Fireclay #1; 1992-10-01 to 1994-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Long Fork Coal Company; 1992-10-01 to 1994-02-22; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Coal Company Inc → Long Fork Coal Company Fireclay #1; 1994-02-23 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Joby  Fields → Long Fork Coal Company Fireclay #1; 1994-02-23 to 1995-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Joby  Fields → Pioneer Coal Company Inc; 1994-02-23 to 1995-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Long Fork Coal Company → Long Fork Coal Company Fireclay #1; 1995-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Long Fork Coal Company; 1995-09-12 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Long Fork Coal Company Fireclay #1; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Long Fork Coal Company; 2011-06-01 to 1994-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Long Fork Coal Company; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Long Fork Coal Company Fireclay #1; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Long Fork Coal Company; 2016-07-26 to 1994-02-22; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Long Fork Coal Company; 2016-07-26 to current/open; source msha-controller-operator-history