# Relationship history for MSHA mine 4604168

Current hierarchy: **Core Natural Resources Inc → Wolf Run Mining LLC → Leer South 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

- **operator_operates_mine:** Kitt Energy Corp → Leer South Mine; 1973-11-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Republic Steel Corp → Leer South Mine; 1973-11-01 to 1982-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Republic Steel Corp → Kitt Energy Corp; 1973-11-01 to 1982-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Kitt Energy Corp → Leer South Mine; 1982-06-01 to 1987-03-24; source msha-controller-operator-history
- **controller_controls_mine:** British Petroleum Company PLC → Leer South Mine; 1982-06-01 to 1987-03-24; source msha-controller-operator-history
- **controller_controls_operator:** British Petroleum Company PLC → Kitt Energy Corp; 1982-06-01 to 1987-03-24; source msha-controller-operator-history
- **operator_operates_mine:** Philippi Mining Company → Leer South Mine; 1987-03-25 to 1990-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Fay E  Leydig → Leer South Mine; 1987-03-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Fay E  Leydig → Philippi Mining Company; 1987-03-25 to 1990-07-16; source msha-controller-operator-history
- **operator_operates_mine:** Anker West Virginia Mining Company Inc → Leer South Mine; 1990-07-17 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Anker Group Inc → Leer South Mine; 1990-07-17 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Anker West Virginia Mining Company Inc; 1990-07-17 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Rex  Fought → Leer South Mine; 1991-01-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wayne Processing Inc → Leer South Mine; 1999-06-01 to 2001-04-01; source msha-controller-operator-history
- **controller_controls_operator:** Rex  Fought → Wayne Processing Inc; 1999-06-01 to 2001-04-01; source msha-controller-operator-history
- **operator_operates_mine:** Anker West Virginia Mining Company Inc → Leer South Mine; 2001-04-02 to 2001-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Anker West Virginia Mining Company Inc; 2001-04-02 to 2001-06-14; source msha-controller-operator-history
- **operator_operates_mine:** Ryanstone Coal Llc → Leer South Mine; 2001-06-15 to 2002-06-06; source msha-controller-operator-history
- **controller_controls_mine:** Jimmie R  Ryan et al → Leer South Mine; 2001-06-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jimmie R  Ryan et al → Ryanstone Coal Llc; 2001-06-15 to 2002-06-06; source msha-controller-operator-history
- **operator_operates_mine:** Wolf Run Mining LLC → Leer South Mine; 2002-06-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Anker Group Inc → Wolf Run Mining LLC; 2002-06-07 to 2005-05-31; source msha-controller-operator-history
- **controller_controls_mine:** International Coal Group Inc (ICG) → Leer South Mine; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Anker West Virginia Mining Company Inc; 2005-06-01 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Anker West Virginia Mining Company Inc; 2005-06-01 to 2001-06-14; source msha-controller-operator-history
- **controller_controls_operator:** International Coal Group Inc (ICG) → Wolf Run Mining LLC; 2005-06-01 to 2011-06-14; source msha-controller-operator-history
- **controller_controls_mine:** Arch Resources Inc → Leer South Mine; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Anker West Virginia Mining Company Inc; 2011-06-15 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Anker West Virginia Mining Company Inc; 2011-06-15 to 2001-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Arch Resources Inc → Wolf Run Mining LLC; 2011-06-15 to 2025-01-13; source msha-controller-operator-history
- **controller_controls_mine:** Core Natural Resources Inc → Leer South Mine; 2025-01-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Anker West Virginia Mining Company Inc; 2025-01-14 to 1999-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Anker West Virginia Mining Company Inc; 2025-01-14 to 2001-06-14; source msha-controller-operator-history
- **controller_controls_operator:** Core Natural Resources Inc → Wolf Run Mining LLC; 2025-01-14 to current/open; source msha-controller-operator-history