# Relationship history for MSHA mine 0504569

Current hierarchy: **Zane  Schmeeckle; Jerry  Miller → Miller Family Investments → Sanborne sand and gravel**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Environmental Mining Corp → Sanborne sand and gravel; 1995-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David  Farley → Sanborne sand and gravel; 1995-08-01 to 2007-06-28; source msha-controller-operator-history
- **controller_controls_operator:** David  Farley → Environmental Mining Corp; 1995-08-01 to 2007-06-28; source msha-controller-operator-history
- **controller_controls_mine:** Zane  Schmeeckle  et al → Sanborne sand and gravel; 2007-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Zane  Schmeeckle  et al → Environmental Mining Corp; 2007-06-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jerry  Miller  et al → Environmental Mining Corp; 2007-06-29 to current/open; source msha-controller-operator-history