# Relationship history for MSHA mine 1001640

Current hierarchy: **Jenkins Don → International Minerals & Development Corp → Yankee Fork Placer**

- 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:** International Minerals & Development Corp → Yankee Fork Placer; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jenkins Don → Yankee Fork Placer; 1984-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jenkins Don → International Minerals & Development Corp; 1984-06-01 to current/open; source msha-controller-operator-history