{"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":"3609369","name":"Hemlock Hill Quarry"},"operator":{"type":"operator","id":"0107865","name":"Cross Excavating"},"controller":{"type":"controller","id":"0091293","name":"Chad E  Cross"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"0042401","name":"Jill D Cross"},"object":{"type":"mine","id":"3609369","name":"Hemlock Hill Quarry"},"validFrom":"2004-01-08","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0042401|2004-01-08|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0051753","name":"Jill D. Cross"},"object":{"type":"mine","id":"3609369","name":"Hemlock Hill Quarry"},"validFrom":"2005-09-28","validTo":"2010-02-28","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0051753|2005-09-28|2010-02-28"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0042401","name":"Jill D Cross"},"object":{"type":"operator","id":"0051753","name":"Jill D. Cross"},"validFrom":"2005-09-28","validTo":"2010-02-28","current":false,"derived":true,"evidenceMineId":"3609369","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0051753|2005-09-28|0042401|2004-01-08|3945"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0107865","name":"Cross Excavating"},"object":{"type":"mine","id":"3609369","name":"Hemlock Hill Quarry"},"validFrom":"2010-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0107865|2010-03-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0091293","name":"Chad E  Cross"},"object":{"type":"mine","id":"3609369","name":"Hemlock Hill Quarry"},"validFrom":"2010-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0091293|2010-03-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0091293","name":"Chad E  Cross"},"object":{"type":"operator","id":"0107865","name":"Cross Excavating"},"validFrom":"2010-03-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"3609369","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"3609369|0107865|2010-03-01|0091293|2010-03-01|14671"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"3609369","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"}}