# Relationship history for MSHA mine 4609528

Current hierarchy: **Sev.en Global Investments a.s. → Hampden Coal LLC → Buffalo Deep Mine**

- 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:** Blackhawk Mining LLC → Buffalo Deep Mine; 2014-09-01 to 2020-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Hampden Coal LLC → Buffalo Deep Mine; 2017-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blackhawk Mining LLC → Hampden Coal LLC; 2017-03-15 to 2020-05-31; source msha-controller-operator-history
- **controller_controls_mine:** Sev.en Global Investments a.s. → Buffalo Deep Mine; 2020-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sev.en Global Investments a.s. → Hampden Coal LLC; 2020-06-01 to current/open; source msha-controller-operator-history