# Relationship history for MSHA mine 2900166

Current hierarchy: **IMC Global Inc → Western Ag-Minerals Company → NASH DRAW MINE**

- 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:** Potash Producers Inc → NASH DRAW MINE; 1950-01-01 to 1985-11-14; source msha-controller-operator-history
- **controller_controls_mine:** Pennzoil Company → NASH DRAW MINE; 1950-01-01 to 1985-11-14; source msha-controller-operator-history
- **controller_controls_operator:** Pennzoil Company → Potash Producers Inc; 1950-01-01 to 1985-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Western Ag-Minerals Company → NASH DRAW MINE; 1985-11-15 to 1997-09-30; source msha-controller-operator-history
- **controller_controls_mine:** U S Mineral Co Inc & Rayrock Yellowknife Resources → NASH DRAW MINE; 1985-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** U S Mineral Co Inc & Rayrock Yellowknife Resources → Western Ag-Minerals Company; 1985-11-15 to 1997-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Western Ag-Minerals Company → NASH DRAW MINE; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** IMC Global Inc → NASH DRAW MINE; 1997-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** IMC Global Inc → Western Ag-Minerals Company; 1997-10-01 to current/open; source msha-controller-operator-history