{"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":"3300060","name":"DUFF QUARRY #1"},"operator":{"type":"operator","id":"L03215","name":"Duff Quarry Inc"},"controller":{"type":"controller","id":"0115561","name":"James D  Duff; James S  Duff"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03215","name":"Duff Quarry Inc"},"object":{"type":"mine","id":"3300060","name":"DUFF QUARRY #1"},"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":"3300060|L03215|1950-01-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02592","name":"James E  Duff"},"object":{"type":"mine","id":"3300060","name":"DUFF QUARRY #1"},"validFrom":"1950-01-01","validTo":"2014-09-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3300060|M02592|1950-01-01|2014-09-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02592","name":"James E  Duff"},"object":{"type":"operator","id":"L03215","name":"Duff Quarry Inc"},"validFrom":"1950-01-01","validTo":"2014-09-22","current":false,"derived":true,"evidenceMineId":"3300060","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3300060|L03215|1950-01-01|M02592|1950-01-01|126164"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0115561","name":"James S  Duff et al"},"object":{"type":"mine","id":"3300060","name":"DUFF QUARRY #1"},"validFrom":"2014-09-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3300060|0115561|2014-09-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0115561","name":"James S  Duff et al"},"object":{"type":"operator","id":"L03215","name":"Duff Quarry Inc"},"validFrom":"2014-09-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"3300060","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3300060|L03215|1950-01-01|0115561|2014-09-23|21757"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0115561","name":"James D  Duff et al"},"object":{"type":"operator","id":"L03215","name":"Duff Quarry Inc"},"validFrom":"2014-09-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"3300060","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3300060|L03215|1950-01-01|0115561|2014-09-23|21758"}}],"coverage":{"historyRecords":3,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3300060","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"}}