# Relationship history for MSHA mine 0405227

Current hierarchy: **Pratt Brian-Floyd E Bowman Jr → Southwest Contractors → RANDSBURG PLACER 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Consolidated Placer Dredging Company → RANDSBURG PLACER MINE; 1993-09-01 to 1997-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Browning Resources U S → RANDSBURG PLACER MINE; 1993-09-01 to 1997-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Browning Resources U S → Consolidated Placer Dredging Company; 1993-09-01 to 1997-08-19; source msha-controller-operator-history
- **operator_operates_mine:** Southwest Contractors → RANDSBURG PLACER MINE; 1997-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Pratt Brian-Floyd E Bowman Jr Et Al → RANDSBURG PLACER MINE; 1997-08-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Pratt Brian-Floyd E Bowman Jr Et Al → Southwest Contractors; 1997-08-20 to current/open; source msha-controller-operator-history