# Relationship history for MSHA mine 0405083

Current hierarchy: **Christiansen Scott & Craig Weberg → Tungsten Springs Investment Group Ltd → Tungsten Springs 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

- **controller_controls_mine:** Christiansen Scott & Craig Weberg → Tungsten Springs Mine; 1989-02-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tungsten Springs Investment Group Ltd → Tungsten Springs Mine; 1990-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Christiansen Scott & Craig Weberg → Tungsten Springs Investment Group Ltd; 1990-04-01 to current/open; source msha-controller-operator-history