# Relationship history for MSHA mine 1519716

Current hierarchy: **Dallas  McRae → Blue Gem Mining Inc. → Whetstone**

- 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 Gem Mining Inc. → Whetstone; 2013-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Dallas  McRae → Whetstone; 2013-09-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dallas  McRae → Blue Gem Mining Inc.; 2013-09-18 to current/open; source msha-controller-operator-history