# Relationship history for MSHA mine 2401829

Current hierarchy: **Delaware Ventures & L C Hoffman → Blue Range Mining Company L P → Elk Peak**

- 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 Range Mining Company L P → Elk Peak; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Delaware Ventures & L C Hoffman → Elk Peak; 1986-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delaware Ventures & L C Hoffman → Blue Range Mining Company L P; 1986-08-01 to current/open; source msha-controller-operator-history