# Relationship history for MSHA mine 2401727

Current hierarchy: **Johns Willis Estate → Highland Gold Properties Inc → Highland Gold Properties Incorporated**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Highland Placer Inc → Highland Gold Properties Incorporated; 1983-06-01 to 1987-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Stratton Mark → Highland Gold Properties Incorporated; 1983-06-01 to 1987-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Stratton Mark → Highland Placer Inc; 1983-06-01 to 1987-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Highland Gold Properties Inc → Highland Gold Properties Incorporated; 1987-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Johns Willis Estate → Highland Gold Properties Incorporated; 1987-06-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johns Willis Estate → Highland Gold Properties Inc; 1987-06-22 to current/open; source msha-controller-operator-history