{"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":"0800980","name":"Oak Ridge Mine"},"operator":{"type":"operator","id":"L06012","name":"Midland Chemical Inc"},"controller":{"type":"controller","id":"M02063","name":"Lafarge S A"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06011","name":"Midland Chemical Corp"},"object":{"type":"mine","id":"0800980","name":"Oak Ridge Mine"},"validFrom":"1981-04-01","validTo":"1982-06-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|L06011|1981-04-01|1982-06-30"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M04810","name":"C B  Maddox Jr"},"object":{"type":"mine","id":"0800980","name":"Oak Ridge Mine"},"validFrom":"1981-04-01","validTo":"1982-06-30","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|M04810|1981-04-01|1982-06-30"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M04810","name":"C B  Maddox Jr"},"object":{"type":"operator","id":"L06011","name":"Midland Chemical Corp"},"validFrom":"1981-04-01","validTo":"1982-06-30","current":false,"derived":true,"evidenceMineId":"0800980","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|L06011|1981-04-01|M04810|1981-04-01|132879"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L06012","name":"Midland Chemical Inc"},"object":{"type":"mine","id":"0800980","name":"Oak Ridge Mine"},"validFrom":"1982-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|L06012|1982-07-01|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M02063","name":"Lafarge S A"},"object":{"type":"mine","id":"0800980","name":"Oak Ridge Mine"},"validFrom":"1982-07-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|M02063|1982-07-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M02063","name":"Lafarge S A"},"object":{"type":"operator","id":"L06012","name":"Midland Chemical Inc"},"validFrom":"1982-07-01","validTo":null,"current":true,"derived":true,"evidenceMineId":"0800980","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0800980|L06012|1982-07-01|M02063|1982-07-01|123262"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0800980","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"}}