# Relationship history for MSHA mine 2601633

Current hierarchy: **K M Mining & Development Company → K M Mining & Development Company → Esmeralda Mine Or Esmeralda**

- 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:** K M Mining & Development Company → Esmeralda Mine Or Esmeralda; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** K M Mining & Development Company → Esmeralda Mine Or Esmeralda; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** K M Mining & Development Company → K M Mining & Development Company; 1980-04-01 to current/open; source msha-controller-operator-history