# Relationship history for MSHA mine 2800487

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → CEDAR LAKE PLANT**

- 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:** Morie Company Inc → CEDAR LAKE PLANT; 1950-01-01 to 1996-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Energy & Minerals Inc → CEDAR LAKE PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Energy & Minerals Inc → Morie Company Inc; 1950-01-01 to 1996-12-02; source msha-controller-operator-history
- **controller_controls_mine:** S C R-Sibelco Nv et al → CEDAR LAKE PLANT; 1950-01-01 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → CEDAR LAKE PLANT; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → CEDAR LAKE PLANT; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Unimin Corp → CEDAR LAKE PLANT; 1996-12-03 to 1999-04-30; source msha-controller-operator-history
- **controller_controls_operator:** S C R-Sibelco Nv et al → Unimin Corp; 1996-12-03 to 1999-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates BMC, Inc. → CEDAR LAKE PLANT; 1999-05-01 to 2021-01-25; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Hanson Aggregates BMC, Inc.; 1999-05-01 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → CEDAR LAKE PLANT; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates BMC, Inc.; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → CEDAR LAKE PLANT; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates BMC, Inc.; 2007-08-23 to 2021-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Covia Holdings LLC → CEDAR LAKE PLANT; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Covia Holdings LLC → Unimin Corp; 2021-01-01 to 1999-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → CEDAR LAKE PLANT; 2021-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2021-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2021-01-26 to 2007-08-22; source msha-controller-operator-history