{"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":"1515928","name":"No 1 Surface"},"operator":{"type":"operator","id":"P20657","name":"Evans Coal Corp"},"controller":{"type":"controller","id":"0100865","name":"Americas Energy Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"P18623","name":"E G & R Coal Corp"},"object":{"type":"mine","id":"1515928","name":"No 1 Surface"},"validFrom":"1987-02-01","validTo":"1987-12-27","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|P18623|1987-02-01|1987-12-27"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C06183","name":"A Y  Evans et al"},"object":{"type":"mine","id":"1515928","name":"No 1 Surface"},"validFrom":"1987-02-01","validTo":"1987-12-27","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|C06183|1987-02-01|1987-12-27"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C06183","name":"A Y  Evans et al"},"object":{"type":"operator","id":"P18623","name":"E G & R Coal Corp"},"validFrom":"1987-02-01","validTo":"1987-12-27","current":false,"derived":true,"evidenceMineId":"1515928","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|P18623|1987-02-01|C06183|1987-02-01|71106"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P20657","name":"Evans Coal Corp"},"object":{"type":"mine","id":"1515928","name":"No 1 Surface"},"validFrom":"1987-12-28","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|P20657|1987-12-28|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C13519","name":"Barbara  Evans et al"},"object":{"type":"mine","id":"1515928","name":"No 1 Surface"},"validFrom":"1987-12-28","validTo":"2010-03-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|C13519|1987-12-28|2010-03-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C13519","name":"Barbara  Evans et al"},"object":{"type":"operator","id":"P20657","name":"Evans Coal Corp"},"validFrom":"1987-12-28","validTo":"2010-03-31","current":false,"derived":true,"evidenceMineId":"1515928","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|P20657|1987-12-28|C13519|1987-12-28|90207"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0100865","name":"Americas Energy Company"},"object":{"type":"mine","id":"1515928","name":"No 1 Surface"},"validFrom":"2010-04-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|0100865|2010-04-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0100865","name":"Americas Energy Company"},"object":{"type":"operator","id":"P20657","name":"Evans Coal Corp"},"validFrom":"2010-04-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"1515928","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"1515928|P20657|1987-12-28|0100865|2010-04-01|16884"}}],"coverage":{"historyRecords":3,"edgeCount":8,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1515928","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"}}