{"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":"0405002","name":"Smith Sand"},"operator":{"type":"operator","id":"L14429","name":"Riverside Cement Company"},"controller":{"type":"controller","id":"M10970","name":"Ssangyong Corp"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"mine","id":"0405002","name":"Smith Sand"},"validFrom":"1979-12-07","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|M00521|1979-12-07|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L03736","name":"Riverside Cement Company"},"object":{"type":"mine","id":"0405002","name":"Smith Sand"},"validFrom":"1989-01-01","validTo":"1995-01-31","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|L03736|1989-01-01|1995-01-31"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00521","name":"Hanson PLC"},"object":{"type":"operator","id":"L03736","name":"Riverside Cement Company"},"validFrom":"1989-01-01","validTo":"1995-01-31","current":false,"derived":true,"evidenceMineId":"0405002","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|L03736|1989-01-01|M00521|1979-12-07|112077"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L14429","name":"Riverside Cement Company"},"object":{"type":"mine","id":"0405002","name":"Smith Sand"},"validFrom":"1995-02-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|L14429|1995-02-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M10970","name":"Ssangyong Corp"},"object":{"type":"mine","id":"0405002","name":"Smith Sand"},"validFrom":"1995-02-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|M10970|1995-02-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M10970","name":"Ssangyong Corp"},"object":{"type":"operator","id":"L14429","name":"Riverside Cement Company"},"validFrom":"1995-02-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0405002","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0405002|L14429|1995-02-01|M10970|1995-02-01|150345"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0405002","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"}}