# Relationship history for MSHA mine 0503507

Current hierarchy: **Jones R L → Silverglade Mining Company → Goldbelt Tunnel Mine And Mill**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Argosy Mining Company → Goldbelt Tunnel Mine And Mill; 1980-01-01 to 1981-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Keith Henry J Jr → Goldbelt Tunnel Mine And Mill; 1980-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Keith Henry J Jr → Argosy Mining Company; 1980-01-01 to 1981-01-25; source msha-controller-operator-history
- **operator_operates_mine:** Silverglade Mining Company → Goldbelt Tunnel Mine And Mill; 1981-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Jones R L → Goldbelt Tunnel Mine And Mill; 1981-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones R L → Silverglade Mining Company; 1981-01-26 to current/open; source msha-controller-operator-history