# Relationship history for MSHA mine 2601684

Current hierarchy: **Shepherd Harvey & Kenneth A Ray → Potosi Mining Company → Potosi**

- 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

- **controller_controls_mine:** Melco General → Potosi; 1980-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Candelaria Metals Inc → Potosi; 1980-11-01 to 1983-12-28; source msha-controller-operator-history
- **controller_controls_operator:** Melco General → Candelaria Metals Inc; 1980-11-01 to 1983-12-28; source msha-controller-operator-history
- **operator_operates_mine:** Potosi Mining Company → Potosi; 1983-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Shepherd Harvey & Kenneth A Ray → Potosi; 1983-12-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Shepherd Harvey & Kenneth A Ray → Potosi Mining Company; 1983-12-29 to current/open; source msha-controller-operator-history