# Relationship history for MSHA mine 0503530

Current hierarchy: **Houston Mining $ Resources Inc & Winstock Mining C → Winstock Mining Corp (Us) → Clay County 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:** Gold Ridge Mining Company → Clay County Mine; 1980-01-01 to 1983-06-16; source msha-controller-operator-history
- **controller_controls_mine:** Houston Mining & Resources Inc → Clay County Mine; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houston Mining & Resources Inc → Gold Ridge Mining Company; 1980-01-01 to 1983-06-16; source msha-controller-operator-history
- **operator_operates_mine:** Winstock Mining Corp (Us) → Clay County Mine; 1983-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Houston Mining $ Resources Inc & Winstock Mining C → Clay County Mine; 1983-06-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Houston Mining $ Resources Inc & Winstock Mining C → Winstock Mining Corp (Us); 1983-06-17 to current/open; source msha-controller-operator-history