{"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":"4604933","name":"Switzer No 3 Mine"},"operator":{"type":"operator","id":"P06656","name":"Stevan Coal Company"},"controller":{"type":"controller","id":"C05525","name":"American Mountaineer Mining Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C03222","name":"Stepp Gale B"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1974-04-04","validTo":"1977-05-05","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|C03222|1974-04-04|1977-05-05"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P03902","name":"Stevan Coal Company"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1975-11-10","validTo":"1976-05-09","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P03902|1975-11-10|1976-05-09"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C03222","name":"Stepp Gale B"},"object":{"type":"operator","id":"P03902","name":"Stevan Coal Company"},"validFrom":"1975-11-10","validTo":"1976-05-09","current":false,"derived":true,"evidenceMineId":"4604933","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P03902|1975-11-10|C03222|1974-04-04|62285"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P01337","name":"Stevan Coal Company"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1976-05-10","validTo":"1977-05-05","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P01337|1976-05-10|1977-05-05"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C01443","name":"Varner John"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1976-05-10","validTo":"1977-05-05","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|C01443|1976-05-10|1977-05-05"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C01443","name":"Varner John"},"object":{"type":"operator","id":"P01337","name":"Stevan Coal Company"},"validFrom":"1976-05-10","validTo":"1977-05-05","current":false,"derived":true,"evidenceMineId":"4604933","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P01337|1976-05-10|C01443|1976-05-10|54131"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P06656","name":"Stevan Coal Company"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1977-05-06","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P06656|1977-05-06|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C05525","name":"American Mountaineer Mining Inc"},"object":{"type":"mine","id":"4604933","name":"Switzer No 3 Mine"},"validFrom":"1977-05-06","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|C05525|1977-05-06|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C05525","name":"American Mountaineer Mining Inc"},"object":{"type":"operator","id":"P06656","name":"Stevan Coal Company"},"validFrom":"1977-05-06","validTo":null,"current":true,"derived":true,"evidenceMineId":"4604933","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"4604933|P06656|1977-05-06|C05525|1977-05-06|69036"}}],"coverage":{"historyRecords":3,"edgeCount":9,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4604933","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"}}