# Relationship history for MSHA mine 0504989

Current hierarchy: **Mike  London → IGWT Mining, Inc. → Hector Placer Mine**

- 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:** IGWT Mining, Inc. → Hector Placer Mine; 2011-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mike  London et al → Hector Placer Mine; 2011-07-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mike  London et al → IGWT Mining, Inc.; 2011-07-26 to current/open; source msha-controller-operator-history