# Relationship history for MSHA mine 3502673

Current hierarchy: **MDU Resources Group Inc → Rogue Aggregates Inc → Highbanks Road Pit & 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Plumley Rock Crushing Inc → Highbanks Road Pit & Plant; 1950-01-01 to 1983-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Plumley Douglas → Highbanks Road Pit & Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Plumley Douglas → Plumley Rock Crushing Inc; 1950-01-01 to 1983-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → Highbanks Road Pit & Plant; 1983-06-28 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Earl W  Lininger et al → Highbanks Road Pit & Plant; 1983-06-28 to 1990-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Earl W  Lininger et al → Rogue Aggregates Inc; 1983-06-28 to 1990-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → Highbanks Road Pit & Plant; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **controller_controls_mine:** Terra Industries Inc → Highbanks Road Pit & Plant; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Terra Industries Inc → Rogue Aggregates Inc; 1990-07-01 to 1993-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Rogue Aggregates Inc → Highbanks Road Pit & Plant; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → Highbanks Road Pit & Plant; 1993-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Rogue Aggregates Inc; 1993-09-01 to current/open; source msha-controller-operator-history