{"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":"4608185","name":"Johnstown No. 1"},"operator":{"type":"operator","id":"P23954","name":"Difficult Mining Inc"},"controller":{"type":"controller","id":"C15717","name":"Courtland  Helbig"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P22076","name":"Linn Mining Company Inc"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1992-06-01","validTo":"1995-10-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P22076|1992-06-01|1995-10-29"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01986","name":"James H  Atkinson"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1992-06-01","validTo":"1995-10-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|C01986|1992-06-01|1995-10-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01986","name":"James H  Atkinson"},"object":{"type":"operator","id":"P22076","name":"Linn Mining Company Inc"},"validFrom":"1992-06-01","validTo":"1995-10-29","current":false,"derived":true,"evidenceMineId":"4608185","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P22076|1992-06-01|C01986|1992-06-01|57052"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23314","name":"Linn Mining Company"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1995-10-30","validTo":"1999-04-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P23314|1995-10-30|1999-04-22"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C15349","name":"Jeffrey D  Atkinson"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1995-10-30","validTo":"1999-04-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|C15349|1995-10-30|1999-04-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C15349","name":"Jeffrey D  Atkinson"},"object":{"type":"operator","id":"P23314","name":"Linn Mining Company"},"validFrom":"1995-10-30","validTo":"1999-04-22","current":false,"derived":true,"evidenceMineId":"4608185","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P23314|1995-10-30|C15349|1995-10-30|95409"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C15717","name":"Courtland  Helbig"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1998-03-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|C15717|1998-03-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P23954","name":"Difficult Mining Inc"},"object":{"type":"mine","id":"4608185","name":"Johnstown No. 1"},"validFrom":"1999-04-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P23954|1999-04-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C15717","name":"Courtland  Helbig"},"object":{"type":"operator","id":"P23954","name":"Difficult Mining Inc"},"validFrom":"1999-04-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"4608185","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4608185|P23954|1999-04-23|C15717|1998-03-01|96627"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4608185","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"}}