# Relationship history for MSHA mine 3609885

Current hierarchy: **Marc S  Sandri → Blue Ridge Mining L.P. → Blue Ridge Mining L.P.**

- 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

- **operator_operates_mine:** Blue Ridge Mining L.P. → Blue Ridge Mining L.P.; 2010-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Marc S  Sandri → Blue Ridge Mining L.P.; 2010-10-01 to 2015-04-13; source msha-controller-operator-history
- **controller_controls_operator:** Marc S  Sandri → Blue Ridge Mining L.P.; 2010-10-01 to 2015-04-13; source msha-controller-operator-history
- **controller_controls_mine:** Daniel L  Long et al → Blue Ridge Mining L.P.; 2015-04-14 to 2021-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Daniel L  Long et al → Blue Ridge Mining L.P.; 2015-04-14 to 2021-09-18; source msha-controller-operator-history
- **controller_controls_operator:** Mark S  Sandri et al → Blue Ridge Mining L.P.; 2015-04-14 to 2021-09-18; source msha-controller-operator-history
- **controller_controls_mine:** Marc S  Sandri → Blue Ridge Mining L.P.; 2021-09-19 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Marc S  Sandri → Blue Ridge Mining L.P.; 2021-09-19 to current/open; source msha-controller-operator-history