# Relationship history for MSHA mine 3502875

Current hierarchy: **Knife River Corporation → Knife River Materials → MURPHY CREEK**

- 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

- **controller_controls_mine:** Steve  Ausland  et al → MURPHY CREEK; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Applegate Aggregates Inc → MURPHY CREEK; 1978-03-09 to 1983-06-08; source msha-controller-operator-history
- **controller_controls_mine:** Bill  Mignot → MURPHY CREEK; 1978-03-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bill  Mignot → Applegate Aggregates Inc; 1978-03-09 to 1983-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Copeland Sand & Gravel Inc → MURPHY CREEK; 1983-06-09 to 2015-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Steve  Ausland  et al → Copeland Sand & Gravel Inc; 1983-06-09 to 2015-05-25; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Copeland  et al → Copeland Sand & Gravel Inc; 1983-06-09 to 2015-05-25; source msha-controller-operator-history
- **controller_controls_mine:** MDU Resources Group Inc → MURPHY CREEK; 2004-05-28 to 2023-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Copeland Paving → MURPHY CREEK; 2015-05-26 to 2020-06-09; source msha-controller-operator-history
- **controller_controls_mine:** Robert S  Copeland → MURPHY CREEK; 2015-05-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert S  Copeland → Copeland Paving; 2015-05-26 to 2020-06-09; source msha-controller-operator-history
- **operator_operates_mine:** CPI Acquisitions LLC → MURPHY CREEK; 2020-06-10 to 2026-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Ron H  DePue  et al → MURPHY CREEK; 2020-06-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ron H  DePue  et al → CPI Acquisitions LLC; 2020-06-10 to 2026-04-23; source msha-controller-operator-history
- **controller_controls_operator:** Todd A  Baker  et al → CPI Acquisitions LLC; 2020-06-10 to 2026-04-23; source msha-controller-operator-history
- **controller_controls_mine:** Knife River Corporation → MURPHY CREEK; 2023-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Knife River Materials → MURPHY CREEK; 2026-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Knife River Corporation → Knife River Materials; 2026-04-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** MDU Resources Group Inc → Knife River Materials; 2026-04-24 to 2023-05-31; source msha-controller-operator-history