# Relationship history for MSHA mine 4609309

Current hierarchy: **Justin L Simmons; Alexander J Woods → Potomac North Inc → Endeavor 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:** Magnum Coal Company → Endeavor Surface Mine; 2006-01-01 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Patriot Coal Corporation → Endeavor Surface Mine; 2008-07-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hobet Mining LLC → Endeavor Surface Mine; 2008-10-16 to 2015-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Magnum Coal Company → Hobet Mining LLC; 2008-10-16 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Patriot Coal Corporation → Hobet Mining LLC; 2008-10-16 to 2015-10-27; source msha-controller-operator-history
- **operator_operates_mine:** ERP Environmental Fund Inc. → Endeavor Surface Mine; 2015-10-28 to 2022-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Conservation Legacy Fund (VCLF) → Endeavor Surface Mine; 2015-10-28 to 2017-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Virginia Conservation Legacy Fund (VCLF) → ERP Environmental Fund Inc.; 2015-10-28 to 2017-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Kissito Healthcare Inc → Endeavor Surface Mine; 2017-01-26 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Kissito Healthcare Inc → ERP Environmental Fund Inc.; 2017-01-26 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Conservation Legacy Fund (VCLF) → Endeavor Surface Mine; 2019-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Virginia Conservation Legacy Fund (VCLF) → ERP Environmental Fund Inc.; 2019-01-01 to 2022-04-12; source msha-controller-operator-history
- **controller_controls_mine:** Curtis  Layman et al → Endeavor Surface Mine; 2019-07-23 to 2021-03-11; source msha-controller-operator-history
- **controller_controls_mine:** Justin L Simmons et al → Endeavor Surface Mine; 2021-03-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Potomac North Inc → Endeavor Surface Mine; 2022-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Curtis  Layman et al → Potomac North Inc; 2022-04-13 to 2021-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Jannette  Layman et al → Potomac North Inc; 2022-04-13 to 2021-03-11; source msha-controller-operator-history
- **controller_controls_operator:** Justin L Simmons et al → Potomac North Inc; 2022-04-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Alexander J Woods et al → Potomac North Inc; 2022-04-13 to current/open; source msha-controller-operator-history