# Relationship history for MSHA mine 4405498

Current hierarchy: **Metinvest B V → Wellmore Coal Company, LLC → Nora Preparation Plant**

- 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:** Fields Resources Inc → Nora Preparation Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** M A Hanna Company et al → Nora Preparation Plant; 1980-06-26 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Norton Coal Company → Nora Preparation Plant; 1980-09-01 to 1981-02-20; source msha-controller-operator-history
- **controller_controls_operator:** Fields Resources Inc → Norton Coal Company; 1980-09-01 to 1981-02-20; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Energy Company → Nora Preparation Plant; 1981-02-21 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** M A Hanna Company et al → Rapoca Energy Company; 1981-02-21 to 1985-09-26; source msha-controller-operator-history
- **controller_controls_operator:** W R Grace Company et al → Rapoca Energy Company; 1981-02-21 to 1985-09-26; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Group LLC → Nora Preparation Plant; 1985-09-27 to 2008-12-04; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Nora Preparation Plant; 1985-09-27 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Rapoca Group LLC; 1985-09-27 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Nora Preparation Plant; 2000-01-13 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Nora Preparation Plant; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Nora Preparation Plant; 2006-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Rapoca Group LLC; 2006-01-02 to 2008-12-04; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Company, LLC → Nora Preparation Plant; 2008-12-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Company, LLC; 2008-12-05 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Wellmore Coal Company, LLC; 2008-12-05 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Nora Preparation Plant; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Wellmore Coal Company, LLC; 2009-04-30 to current/open; source msha-controller-operator-history