# Relationship history for MSHA mine 4404982

Current hierarchy: **Metinvest B V → The Black Diamond Company → Wellmore #8 Prep 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** United  Company → Wellmore #8 Prep Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Wellmore #8 Prep Plant; 1978-02-01 to 1997-08-25; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Wellmore Coal Corp; 1978-02-01 to 1997-08-25; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Wellmore #8 Prep Plant; 1985-09-27 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Southern Mining Co → Wellmore #8 Prep Plant; 1985-11-27 to 2006-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Wellmore Coal Corp → Wellmore #8 Prep Plant; 1997-08-26 to 1997-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Massey Energy Company → Wellmore #8 Prep Plant; 1997-08-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Massey Energy Company → Wellmore Coal Corp; 1997-08-26 to 1997-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Rapoca Energy Company → Wellmore #8 Prep Plant; 1997-10-14 to 2006-11-20; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Rapoca Energy Company; 1997-10-14 to 2005-12-31; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Wellmore #8 Prep Plant; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Wellmore #8 Prep Plant; 2006-01-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Rapoca Energy Company; 2006-01-02 to 2006-11-20; source msha-controller-operator-history
- **operator_operates_mine:** The Black Diamond Company → Wellmore #8 Prep Plant; 2006-11-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → The Black Diamond Company; 2006-11-21 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → The Black Diamond Company; 2006-11-21 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Wellmore #8 Prep Plant; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → The Black Diamond Company; 2009-04-30 to current/open; source msha-controller-operator-history