# Relationship history for MSHA mine 4608645

Current hierarchy: **Lexington Coal Holdings, Inc → Lexington Coal Company, LLC → Twilight Mtr Surface Mine**

- 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 → Twilight Mtr Surface Mine; 1991-12-01 to 2011-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Progress Coal → Twilight Mtr Surface Mine; 1997-06-01 to 2014-02-23; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Twilight Mtr Surface Mine; 1997-06-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Progress Coal; 1997-06-01 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Twilight Mtr Surface Mine; 2011-06-01 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources, Inc. → Twilight Mtr Surface Mine; 2011-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Progress Coal; 2011-06-01 to 2014-02-23; source msha-controller-operator-history
- **operator_operates_mine:** Independence Coal Co. LLC → Twilight Mtr Surface Mine; 2014-02-24 to 2017-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources, Inc. → Independence Coal Co. LLC; 2014-02-24 to 2016-07-25; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Independence Coal Co. LLC; 2014-02-24 to 2011-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Alpha Natural Resources Holdings, Inc → Twilight Mtr Surface Mine; 2016-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alpha Natural Resources Holdings, Inc → Independence Coal Co. LLC; 2016-07-26 to 2017-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Lexington Coal Company, LLC → Twilight Mtr Surface Mine; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Lexington Coal Holdings, Inc → Twilight Mtr Surface Mine; 2017-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lexington Coal Holdings, Inc → Lexington Coal Company, LLC; 2017-10-23 to current/open; source msha-controller-operator-history