# Relationship history for MSHA mine 0203515

Current hierarchy: **KE&G Construction Inc ESOP → KE&G Construction → Tombstone Gold and Silver**

- 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:** KE&G Construction → Tombstone Gold and Silver; 2024-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** KE&G Construction Inc ESOP → Tombstone Gold and Silver; 2024-09-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** KE&G Construction Inc ESOP → KE&G Construction; 2024-09-20 to current/open; source msha-controller-operator-history