# Relationship history for MSHA mine 4608939

Current hierarchy: **Virginia Conservation Legacy Fund (VCLF) → ERP Environmental Fund Inc. → Guyan 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Ashland Inc et al → Guyan Mine; 1987-05-19 to 2005-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Apogee Coal Company LLC → Guyan Mine; 2002-01-02 to 2015-10-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Apogee Coal Company LLC; 2002-01-02 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Magnum Coal Company → Guyan Mine; 2006-01-01 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Magnum Coal Company → Apogee Coal Company LLC; 2006-01-01 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Patriot Coal Corporation → Guyan Mine; 2008-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patriot Coal Corporation → Apogee Coal Company LLC; 2008-07-23 to 2015-10-27; source msha-controller-operator-history
- **operator_operates_mine:** ERP Environmental Fund Inc. → Guyan Mine; 2015-10-28 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Conservation Legacy Fund (VCLF) → Guyan 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 → Guyan 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) → Guyan 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 current/open; source msha-controller-operator-history