{"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":"0102149","name":"Leeds Quarry"},"operator":{"type":"operator","id":"L00002","name":"Lehigh Portland Cement Company"},"controller":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"mine","id":"0102149","name":"Leeds Quarry"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|M00004|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00222","name":"USX Corp (United States Steel Corp)"},"object":{"type":"mine","id":"0102149","name":"Leeds Quarry"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|M00222|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00275","name":"United States Steel Corp"},"object":{"type":"mine","id":"0102149","name":"Leeds Quarry"},"validFrom":"1979-10-01","validTo":"1980-10-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|L00275|1979-10-01|1980-10-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00222","name":"USX Corp (United States Steel Corp)"},"object":{"type":"operator","id":"L00275","name":"United States Steel Corp"},"validFrom":"1979-10-01","validTo":"1980-10-22","current":false,"derived":true,"evidenceMineId":"0102149","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|L00275|1979-10-01|M00222|1950-01-01|107622"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00002","name":"Lehigh Portland Cement Company"},"object":{"type":"mine","id":"0102149","name":"Leeds Quarry"},"validFrom":"1980-10-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|L00002|1980-10-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00004","name":"Heidelberg Materials AG"},"object":{"type":"operator","id":"L00002","name":"Lehigh Portland Cement Company"},"validFrom":"1980-10-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"0102149","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0102149|L00002|1980-10-23|M00004|1950-01-01|100499"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0102149","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"}}