{"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":"4103754","name":"Howell Pit"},"operator":{"type":"operator","id":"L14175","name":"Young Materials Corporation"},"controller":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01250","name":"F M  Young"},"object":{"type":"mine","id":"4103754","name":"Howell Pit"},"validFrom":"1950-01-01","validTo":"2003-07-10","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103754|M01250|1950-01-01|2003-07-10"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14175","name":"Young Materials Corporation"},"object":{"type":"mine","id":"4103754","name":"Howell Pit"},"validFrom":"1992-11-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103754|L14175|1992-11-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01250","name":"F M  Young"},"object":{"type":"operator","id":"L14175","name":"Young Materials Corporation"},"validFrom":"1992-11-01","validTo":"2003-07-10","current":false,"derived":true,"evidenceMineId":"4103754","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103754|L14175|1992-11-01|M01250|1950-01-01|117659"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"mine","id":"4103754","name":"Howell Pit"},"validFrom":"2003-07-11","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103754|M09717|2003-07-11|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M09717","name":"MDU Resources Group Inc"},"object":{"type":"operator","id":"L14175","name":"Young Materials Corporation"},"validFrom":"2003-07-11","validTo":null,"current":true,"derived":true,"evidenceMineId":"4103754","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4103754|L14175|1992-11-01|M09717|2003-07-11|147291"}}],"coverage":{"historyRecords":2,"edgeCount":5,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4103754","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"}}