# Relationship history for MSHA mine 4608818

Current hierarchy: **John Mitch Potter → Coal-Mac LLC → Callisto 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:** Ashland Inc et al → Callisto Mine; 1989-10-19 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Callisto Mine; 1997-07-01 to 2019-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Thunderhill Coal, LLC → Callisto Mine; 2000-01-01 to 2015-10-27; source msha-controller-operator-history
- **controller_controls_mine:** Chris  Cline → Callisto Mine; 2000-01-01 to 2006-03-17; source msha-controller-operator-history
- **controller_controls_operator:** Chris  Cline → Thunderhill Coal, LLC; 2000-01-01 to 2006-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Magnum Coal Company → Callisto Mine; 2006-03-18 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_operator:** Magnum Coal Company → Thunderhill Coal, LLC; 2006-03-18 to 2008-07-22; source msha-controller-operator-history
- **controller_controls_mine:** Patriot Coal Corporation → Callisto Mine; 2008-07-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Patriot Coal Corporation → Thunderhill Coal, LLC; 2008-07-23 to 2015-10-27; source msha-controller-operator-history
- **operator_operates_mine:** ERP Environmental Fund Inc. → Callisto Mine; 2015-10-28 to 2020-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Virginia Conservation Legacy Fund (VCLF) → Callisto 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 → Callisto 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) → Callisto 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 2020-12-02; source msha-controller-operator-history
- **controller_controls_mine:** John Mitch Potter → Callisto Mine; 2019-10-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal-Mac LLC → Callisto Mine; 2020-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John Mitch Potter → Coal-Mac LLC; 2020-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc et al → Coal-Mac LLC; 2020-12-03 to 1997-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Coal-Mac LLC; 2020-12-03 to 2019-10-22; source msha-controller-operator-history