# Relationship history for MSHA mine 2601627

Current hierarchy: **De La Mare R W → De La Mare Mine Ltd → Dayton Mine & Mill**

- 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:** De La Mare Mine Ltd → Dayton Mine & Mill; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** De La Mare R W → Dayton Mine & Mill; 1980-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** De La Mare R W → De La Mare Mine Ltd; 1980-03-01 to current/open; source msha-controller-operator-history