{"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":"2026-10-13T11:19:05.459773+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":"2002911","name":"THUNDER BAY CONCRETE PROD."},"operator":{"type":"operator","id":"L31909","name":"Clay & Graham Inc"},"controller":{"type":"controller","id":"M31909","name":"Don  Clay"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L31909","name":"Clay & Graham Inc"},"object":{"type":"mine","id":"2002911","name":"THUNDER BAY CONCRETE PROD."},"validFrom":"1993-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2002911|L31909|1993-10-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M31909","name":"Don  Clay"},"object":{"type":"mine","id":"2002911","name":"THUNDER BAY CONCRETE PROD."},"validFrom":"1993-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2002911|M31909|1993-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M31909","name":"Don  Clay"},"object":{"type":"operator","id":"L31909","name":"Clay & Graham Inc"},"validFrom":"1993-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"2002911","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"2002911|L31909|1993-10-01|M31909|1993-10-01|160279"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2002911","dataSource":"postgres","snapshotId":"2026-10-13T11:19:05.459773+00:00","completedAt":"2026-10-13T11:26:59.401Z","sourceCount":20,"totalRows":17906804,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}