# Relationship history for MSHA mine 1516520

Current hierarchy: **Sev.en Global Investments a.s. → Blue Diamond Coal Company → No. 76  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:** Blue Diamond Coal Company → No. 76  Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 76  Plant; 1988-11-01 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_operator:** Blue Diamond Coal Company → Blue Diamond Coal Company; 1988-11-01 to 1998-05-17; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No. 76  Plant; 1998-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leatherwood Processing Company → No. 76  Plant; 1998-05-18 to 2008-11-16; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → No. 76  Plant; 1998-05-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Leatherwood Processing Company; 1998-05-18 to 2008-11-16; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 76  Plant; 2008-11-17 to 2014-09-03; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → Blue Diamond Coal Company; 2008-11-17 to 2014-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Coal Company → No. 76  Plant; 2014-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → No. 76  Plant; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blue Diamond Coal Company; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → No. 76  Plant; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Blue Diamond Coal Company; 2020-06-01 to current/open; source msha-controller-operator-history