{"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":"2026-10-18T09:31:49.615908+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":"3901627","name":"Black Hills Gravel"},"operator":{"type":"operator","id":"0153993","name":"Black Hills Gravel LLC"},"controller":{"type":"controller","id":"0137021","name":"Mark  Nielsen; David Patrick  Zeimet; Cliff W  Zeimet"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-18T09:31:49.615908+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0153993","name":"Black Hills Gravel LLC"},"object":{"type":"mine","id":"3901627","name":"Black Hills Gravel"},"validFrom":"2017-05-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3901627|0153993|2017-05-24|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0137021","name":"David Patrick  Zeimet et al"},"object":{"type":"mine","id":"3901627","name":"Black Hills Gravel"},"validFrom":"2017-05-24","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3901627|0137021|2017-05-24|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137021","name":"David Patrick  Zeimet et al"},"object":{"type":"operator","id":"0153993","name":"Black Hills Gravel LLC"},"validFrom":"2017-05-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"3901627","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3901627|0153993|2017-05-24|0137021|2017-05-24|27610"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137021","name":"Mark  Nielsen et al"},"object":{"type":"operator","id":"0153993","name":"Black Hills Gravel LLC"},"validFrom":"2017-05-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"3901627","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3901627|0153993|2017-05-24|0137021|2017-05-24|27611"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0137021","name":"Cliff W  Zeimet et al"},"object":{"type":"operator","id":"0153993","name":"Black Hills Gravel LLC"},"validFrom":"2017-05-24","validTo":null,"current":true,"derived":true,"evidenceMineId":"3901627","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-18T09:31:49.615908+00:00","recordKey":"3901627|0153993|2017-05-24|0137021|2017-05-24|27612"}}],"coverage":{"historyRecords":3,"edgeCount":5,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3901627","dataSource":"postgres","snapshotId":"2026-10-18T09:31:49.615908+00:00","completedAt":"2026-10-18T09:31:49.615Z","sourceCount":20,"totalRows":17915666,"relationshipSemantics":"valid time; null validTo means current or open-ended in the source"}}