# Relationship history for MSHA mine 3503506

Current hierarchy: **Crestline Holdings LLC; CRG Holdings LLC → Crestline Const Co LLC dba TD Columbia → Taylor Lake**

- 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:** Mosier Creek Quarry → Taylor Lake; 2000-10-01 to 2006-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Tony R Heldstas → Taylor Lake; 2000-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tony R Heldstas → Mosier Creek Quarry; 2000-10-01 to 2006-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Crestline Const Co LLC dba TD Columbia → Taylor Lake; 2007-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ronald A  Schmidt  et al → Taylor Lake; 2007-01-01 to 2008-06-16; source msha-controller-operator-history
- **controller_controls_operator:** Ronald A  Schmidt  et al → Crestline Const Co LLC dba TD Columbia; 2007-01-01 to 2008-06-16; source msha-controller-operator-history
- **controller_controls_operator:** William P  Lancaster  et al → Crestline Const Co LLC dba TD Columbia; 2007-01-01 to 2008-06-16; source msha-controller-operator-history
- **controller_controls_mine:** CRG Holdings LLC et al → Taylor Lake; 2008-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRG Holdings LLC et al → Crestline Const Co LLC dba TD Columbia; 2008-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Crestline Holdings LLC et al → Crestline Const Co LLC dba TD Columbia; 2008-06-17 to current/open; source msha-controller-operator-history