{"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":"0503502","name":"Unit Train Loadout Facility"},"operator":{"type":"operator","id":"P08998","name":"Snowmass Coal Company"},"controller":{"type":"controller","id":"C06891","name":"Roaring Fork Coal Corp & Lark Mng Corp"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C06891","name":"Roaring Fork Coal Corp & Lark Mng Corp"},"object":{"type":"mine","id":"0503502","name":"Unit Train Loadout Facility"},"validFrom":"1978-12-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0503502|C06891|1978-12-23|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P08998","name":"Snowmass Coal Company"},"object":{"type":"mine","id":"0503502","name":"Unit Train Loadout Facility"},"validFrom":"1979-10-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0503502|P08998|1979-10-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C06891","name":"Roaring Fork Coal Corp & Lark Mng Corp"},"object":{"type":"operator","id":"P08998","name":"Snowmass Coal Company"},"validFrom":"1979-10-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0503502","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0503502|P08998|1979-10-01|C06891|1978-12-23|73133"}}],"coverage":{"historyRecords":1,"edgeCount":3,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0503502","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"}}