# Relationship history for MSHA mine 1518738

Current hierarchy: **Sev.en Global Investments a.s. → Blue Diamond Mining, LLC → Buckeye Strip #1**

- 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:** Kern  Brashear → Buckeye Strip #1; 1987-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kern Coal Inc → Buckeye Strip #1; 2004-03-26 to 2006-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Kern  Brashear → Kern Coal Inc; 2004-03-26 to 2006-01-29; source msha-controller-operator-history
- **operator_operates_mine:** James River Coal Service Company → Buckeye Strip #1; 2006-01-30 to 2014-09-03; source msha-controller-operator-history
- **controller_controls_mine:** James River Coal Company → Buckeye Strip #1; 2006-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James River Coal Company → James River Coal Service Company; 2006-01-30 to 2014-09-03; source msha-controller-operator-history
- **operator_operates_mine:** Blue Diamond Mining, LLC → Buckeye Strip #1; 2014-09-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Blackhawk Mining LLC → Buckeye Strip #1; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Blue Diamond Mining, LLC; 2014-09-04 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → Buckeye Strip #1; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Blue Diamond Mining, LLC; 2020-06-01 to current/open; source msha-controller-operator-history