{"data":{"schemaVersion":"realm.mine-profile.v1","generatedAt":"2026-10-17T06:17:15.228Z","identity":{"mine_id":"3301944","name":"Thompson Mine","status":"Active","status_date":"1981-06-10","mine_type":"Surface","coal_metal":"M","commodity":"Ground Silica","state":"OH","county":"Geauga","nearest_town":"Thompson","operator_id":"0197813","operator_name":"Great Sand LLC","controller_id":"0159743","controller_name":"Covia Holdings LLC","district":"M2","office":"Warrendale PA Field Office","employees":23,"latitude":41.677778,"longitude":-81.042778},"coverage":{"contributingSources":15,"registeredSources":20,"sourceRows":2142},"relationships":{"schemaVersion":"realm.temporal-relationships.v1","temporalSemantics":{"validTime":{"granularity":"date","bounds":"inclusive","nullStart":"start date not published in the upstream history row","nullEnd":"open-ended in the upstream history row; not independent proof of present 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