# Relationship history for MSHA mine 2300889

Current hierarchy: **Limited Leasing Company; Kimaterials, Inc. → Gateway Dredging and Contracting → Dredge Chesterfield**

- 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:** Limited Leasing Company → Dredge Chesterfield; 1950-01-01 to 2011-05-01; source msha-controller-operator-history
- **controller_controls_mine:** St Charles Sand Company → Dredge Chesterfield; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** St Charles Sand Company → Limited Leasing Company; 1950-01-01 to 2011-05-01; source msha-controller-operator-history
- **operator_operates_mine:** Gateway Dredging and Contracting → Dredge Chesterfield; 2011-05-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** David J  Bangert et al → Dredge Chesterfield; 2011-05-02 to 2023-06-07; source msha-controller-operator-history
- **controller_controls_operator:** David J  Bangert et al → Gateway Dredging and Contracting; 2011-05-02 to 2023-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Limited Leasing Company → Dredge Chesterfield; 2023-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Limited Leasing Company → Gateway Dredging and Contracting; 2023-06-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Kimaterials, Inc. → Gateway Dredging and Contracting; 2023-06-08 to current/open; source msha-controller-operator-history