# Relationship history for MSHA mine 4202664

Current hierarchy: **U-Dig Fossils, Inc.; David  Stemmons → Topaz Mountain Adventures → Topaz Dome**

- 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:** Topaz Mountain Adventures → Topaz Dome; 2016-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** U-Dig Fossils, Inc. et al → Topaz Dome; 2016-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U-Dig Fossils, Inc. et al → Topaz Mountain Adventures; 2016-09-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Stemmons et al → Topaz Mountain Adventures; 2016-09-23 to current/open; source msha-controller-operator-history