# Relationship history for MSHA mine 0202018

Current hierarchy: **South Texas Aggregates Inc & Coastal Uranium Inc → Coastal & Western Minerals → Barite Mining & Benefaction Facility**

- 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:** William Clay  Coleman → Barite Mining & Benefaction Facility; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** South Texas Aggregates Inc → Barite Mining & Benefaction Facility; 1980-11-01 to 1981-03-10; source msha-controller-operator-history
- **controller_controls_operator:** William Clay  Coleman → South Texas Aggregates Inc; 1980-11-01 to 1981-03-10; source msha-controller-operator-history
- **operator_operates_mine:** Coastal & Western Minerals → Barite Mining & Benefaction Facility; 1981-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** South Texas Aggregates Inc & Coastal Uranium Inc → Barite Mining & Benefaction Facility; 1981-03-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** South Texas Aggregates Inc & Coastal Uranium Inc → Coastal & Western Minerals; 1981-03-11 to current/open; source msha-controller-operator-history