{"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":"3400922","name":"Nelson Pit"},"operator":{"type":"operator","id":"L12073","name":"Peerless Materials Company"},"controller":{"type":"controller","id":"M09288","name":"Mark E  Krenz"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01066","name":"O'Brien Rock Company Inc"},"object":{"type":"mine","id":"3400922","name":"Nelson Pit"},"validFrom":"1950-01-01","validTo":"1991-03-05","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400922|L01066|1950-01-01|1991-03-05"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00926","name":"O'Brien Eugene"},"object":{"type":"mine","id":"3400922","name":"Nelson Pit"},"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":"3400922|M00926|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00926","name":"O'Brien Eugene"},"object":{"type":"operator","id":"L01066","name":"O'Brien Rock Company Inc"},"validFrom":"1950-01-01","validTo":"1991-03-05","current":false,"derived":true,"evidenceMineId":"3400922","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400922|L01066|1950-01-01|M00926|1950-01-01|115931"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09288","name":"Mark E  Krenz"},"object":{"type":"mine","id":"3400922","name":"Nelson Pit"},"validFrom":"1978-03-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400922|M09288|1978-03-09|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L12073","name":"Peerless Materials Company"},"object":{"type":"mine","id":"3400922","name":"Nelson Pit"},"validFrom":"1991-03-06","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400922|L12073|1991-03-06|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09288","name":"Mark E  Krenz"},"object":{"type":"operator","id":"L12073","name":"Peerless Materials Company"},"validFrom":"1991-03-06","validTo":null,"current":true,"derived":true,"evidenceMineId":"3400922","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3400922|L12073|1991-03-06|M09288|1978-03-09|146030"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3400922","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"}}