# Relationship history for MSHA mine 1000416

Current hierarchy: **Delany Robert & Don → R D Minerals Company → Silver Moon 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

- **operator_operates_mine:** T & B Mining Company Inc → Silver Moon Mine; 1950-01-01 to 1980-08-27; source msha-controller-operator-history
- **controller_controls_mine:** T & B Mining Company Inc → Silver Moon Mine; 1950-01-01 to 1980-08-27; source msha-controller-operator-history
- **controller_controls_operator:** T & B Mining Company Inc → T & B Mining Company Inc; 1950-01-01 to 1980-08-27; source msha-controller-operator-history
- **controller_controls_mine:** Delany Robert & Don → Silver Moon Mine; 1978-12-06 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** R D Minerals Company → Silver Moon Mine; 1980-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Delany Robert & Don → R D Minerals Company; 1980-08-28 to current/open; source msha-controller-operator-history