# Relationship history for MSHA mine 3608769

Current hierarchy: **DTE Energy Company → DTE Synfuels Operations LLC → DTE River Hill LLC**

- 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:** HEADWATERS INCORPORATED → DTE River Hill LLC; 1999-02-01 to 2003-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Brent M  Cook → DTE River Hill LLC; 1999-02-01 to 2002-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Brent M  Cook → HEADWATERS INCORPORATED; 1999-02-01 to 2002-12-01; source msha-controller-operator-history
- **controller_controls_mine:** Kirk A  Benson et al → DTE River Hill LLC; 2002-12-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kirk A  Benson et al → HEADWATERS INCORPORATED; 2002-12-02 to 2003-12-31; source msha-controller-operator-history
- **operator_operates_mine:** DTE Synfuels Operations LLC → DTE River Hill LLC; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** DTE Energy Company → DTE River Hill LLC; 2004-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** DTE Energy Company → DTE Synfuels Operations LLC; 2004-01-01 to current/open; source msha-controller-operator-history