# Relationship history for MSHA mine 4202229

Current hierarchy: **Craig  Dansie; Bruce  Evans → Nephi Sandstone Corp → Champlin 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

- **controller_controls_mine:** Bruce  Evans et al → Champlin Pit; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tuff Rock Llc → Champlin Pit; 1999-02-01 to 1999-06-21; source msha-controller-operator-history
- **controller_controls_mine:** Dale  Snyder et al → Champlin Pit; 1999-02-01 to 1999-06-21; source msha-controller-operator-history
- **controller_controls_operator:** Dale  Snyder et al → Tuff Rock Llc; 1999-02-01 to 1999-06-21; source msha-controller-operator-history
- **operator_operates_mine:** Sweetwater Landscaping → Champlin Pit; 1999-06-22 to 2000-09-11; source msha-controller-operator-history
- **controller_controls_mine:** Richard  Boyce → Champlin Pit; 1999-06-22 to 2000-09-11; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Boyce → Sweetwater Landscaping; 1999-06-22 to 2000-09-11; source msha-controller-operator-history
- **operator_operates_mine:** Nephi Sandstone Corp → Champlin Pit; 2000-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruce  Evans et al → Nephi Sandstone Corp; 2000-09-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Craig  Dansie et al → Nephi Sandstone Corp; 2000-09-12 to current/open; source msha-controller-operator-history