{"data":{"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 control"},"transactionTime":{"observedAt":"2026-10-17T05:35:58.500035+00:00","meaning":"time the checksum-addressed MDRS artifacts were observed by the PostgreSQL ingestion"},"derivation":{"controllerControlsOperator":"intersection of controller and operator valid-time intervals evidenced through this mine","currentIdentity":"current controller and operator are asserted only by the MDRS Mines snapshot"}},"current":{"mine":{"type":"mine","id":"4300762","name":"Ferguson Slate Co Quarry"},"operator":{"type":"operator","id":"L15171","name":"Ferguson Slate Co"},"controller":{"type":"controller","id":"","name":""},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M11563","name":"Jeff  Ferguson"},"object":{"type":"mine","id":"4300762","name":"Ferguson Slate Co Quarry"},"validFrom":"1997-05-13","validTo":"2016-09-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4300762|M11563|1997-05-13|2016-09-28"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L15171","name":"Ferguson Slate Co"},"object":{"type":"mine","id":"4300762","name":"Ferguson Slate Co Quarry"},"validFrom":"2014-02-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4300762|L15171|2014-02-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M11563","name":"Jeff  Ferguson"},"object":{"type":"operator","id":"L15171","name":"Ferguson Slate Co"},"validFrom":"2014-02-24","validTo":"2016-09-28","current":false,"derived":true,"evidenceMineId":"4300762","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4300762|L15171|2014-02-24|M11563|1997-05-13|151738"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4300762","dataSource":"postgres","snapshotId":"2026-10-17T05:35:58.500035+00:00","completedAt":"2026-10-17T06:17:15.228Z","sourceCount":20,"totalRows":15450873,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}