# Relationship history for MSHA mine 4202271

Current hierarchy: **Day Family Investments LLC; Nickle Family Investments LLC → Snowfield Rock Products, LLC → SNOWFIELD PIT**

- 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:** Snowfield Rock Products Llc → SNOWFIELD PIT; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Day Family Investments LLC et al → SNOWFIELD PIT; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Day Family Investments LLC et al → Snowfield Rock Products Llc; 2000-02-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nickle Family Investments LLC et al → Snowfield Rock Products Llc; 2000-02-01 to current/open; source msha-controller-operator-history