{"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":"1301302","name":"NORGAARD SAND & GRAVEL"},"operator":{"type":"operator","id":"0154554","name":"NSG, LLC"},"controller":{"type":"controller","id":"0137683","name":"Zechariah P Norgaard; Peter H Norgaard; Rosemary G Norgaard"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L36728","name":"NORGAARD SAND & GRAVEL"},"object":{"type":"mine","id":"1301302","name":"NORGAARD SAND & GRAVEL"},"validFrom":"1950-01-01","validTo":"2017-12-04","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|L36728|1950-01-01|2017-12-04"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M36728","name":"Peter H Norgaard"},"object":{"type":"mine","id":"1301302","name":"NORGAARD SAND & GRAVEL"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|M36728|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M36728","name":"Peter H Norgaard"},"object":{"type":"operator","id":"L36728","name":"NORGAARD SAND & GRAVEL"},"validFrom":"1950-01-01","validTo":"2017-12-04","current":false,"derived":true,"evidenceMineId":"1301302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|L36728|1950-01-01|M36728|1950-01-01|165917"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0154554","name":"NSG, LLC"},"object":{"type":"mine","id":"1301302","name":"NORGAARD SAND & GRAVEL"},"validFrom":"2017-12-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|0154554|2017-12-05|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0137683","name":"Peter H Norgaard et al"},"object":{"type":"mine","id":"1301302","name":"NORGAARD SAND & GRAVEL"},"validFrom":"2017-12-05","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|0137683|2017-12-05|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137683","name":"Peter H Norgaard et al"},"object":{"type":"operator","id":"0154554","name":"NSG, LLC"},"validFrom":"2017-12-05","validTo":null,"current":true,"derived":true,"evidenceMineId":"1301302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|0154554|2017-12-05|0137683|2017-12-05|27836"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137683","name":"Zechariah P Norgaard et al"},"object":{"type":"operator","id":"0154554","name":"NSG, LLC"},"validFrom":"2017-12-05","validTo":null,"current":true,"derived":true,"evidenceMineId":"1301302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|0154554|2017-12-05|0137683|2017-12-05|27837"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137683","name":"Rosemary G Norgaard et al"},"object":{"type":"operator","id":"0154554","name":"NSG, LLC"},"validFrom":"2017-12-05","validTo":null,"current":true,"derived":true,"evidenceMineId":"1301302","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1301302|0154554|2017-12-05|0137683|2017-12-05|27838"}}],"coverage":{"historyRecords":4,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1301302","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"}}