{"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":"2302261","name":"Joplin Chat Plant"},"operator":{"type":"operator","id":"L00088","name":"L. G. Everist, Inc."},"controller":{"type":"controller","id":"M00038","name":"L G Everist Inc"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"M00038","name":"L G Everist Inc"},"object":{"type":"mine","id":"2302261","name":"Joplin Chat Plant"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|M00038|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"0050397","name":"Ballard Sand & Gravel"},"object":{"type":"mine","id":"2302261","name":"Joplin Chat Plant"},"validFrom":"2002-04-09","validTo":"2002-11-06","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|0050397|2002-04-09|2002-11-06"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0040781","name":"John  Ballard"},"object":{"type":"mine","id":"2302261","name":"Joplin Chat Plant"},"validFrom":"2002-04-09","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|0040781|2002-04-09|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0040781","name":"John  Ballard"},"object":{"type":"operator","id":"0050397","name":"Ballard Sand & Gravel"},"validFrom":"2002-04-09","validTo":"2002-11-06","current":false,"derived":true,"evidenceMineId":"2302261","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|0050397|2002-04-09|0040781|2002-04-09|658"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L00088","name":"L. G. Everist, Inc."},"object":{"type":"mine","id":"2302261","name":"Joplin Chat Plant"},"validFrom":"2002-11-07","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|L00088|2002-11-07|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M00038","name":"L G Everist Inc"},"object":{"type":"operator","id":"L00088","name":"L. G. Everist, Inc."},"validFrom":"2002-11-07","validTo":null,"current":true,"derived":true,"evidenceMineId":"2302261","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"2302261|L00088|2002-11-07|M00038|1950-01-01|102381"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"2302261","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"}}