# Relationship history for MSHA mine 4406557

Current hierarchy: **Metinvest B V → Black Diamond Company → Upper Mill Splashdam**

- 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:** Southern Mining Co → Upper Mill Splashdam; 1985-11-27 to 2006-01-01; source msha-controller-operator-history
- **operator_operates_mine:** Westar Coal Company → Upper Mill Splashdam; 1989-12-01 to 1990-03-18; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Nichols → Upper Mill Splashdam; 1989-12-01 to 1990-03-18; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Nichols → Westar Coal Company; 1989-12-01 to 1990-03-18; source msha-controller-operator-history
- **operator_operates_mine:** Carbo Mining Company → Upper Mill Splashdam; 1990-03-19 to 1991-07-10; source msha-controller-operator-history
- **controller_controls_mine:** Sam  Blankenship → Upper Mill Splashdam; 1990-03-19 to 1991-07-10; source msha-controller-operator-history
- **controller_controls_operator:** Sam  Blankenship → Carbo Mining Company; 1990-03-19 to 1991-07-10; source msha-controller-operator-history
- **operator_operates_mine:** Upper Mill Mining Company → Upper Mill Splashdam; 1991-07-11 to 1998-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Gary A  Horn → Upper Mill Splashdam; 1991-07-11 to 2001-01-28; source msha-controller-operator-history
- **controller_controls_operator:** Gary A  Horn → Upper Mill Mining Company; 1991-07-11 to 1998-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Black Diamond Company → Upper Mill Splashdam; 1998-07-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Southern Mining Co → Black Diamond Company; 1998-07-21 to 2006-01-01; source msha-controller-operator-history
- **controller_controls_mine:** United  Company → Upper Mill Splashdam; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** United  Company → Black Diamond Company; 2006-01-02 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Metinvest B V → Upper Mill Splashdam; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Metinvest B V → Black Diamond Company; 2009-04-30 to current/open; source msha-controller-operator-history