{"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":"4502519","name":"Calhoun Mill"},"operator":{"type":"operator","id":"L08897","name":"C E Minerals-Combustion Engineering Inc"},"controller":{"type":"controller","id":"M01375","name":"Asea Brown Boveri Ltd (ABB)"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"L01535","name":"Boggs Brothers Construction Company"},"object":{"type":"mine","id":"4502519","name":"Calhoun Mill"},"validFrom":"1950-01-01","validTo":"1981-11-16","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|L01535|1950-01-01|1981-11-16"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01369","name":"Boggs Ray L & Byron E"},"object":{"type":"mine","id":"4502519","name":"Calhoun Mill"},"validFrom":"1950-01-01","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|M01369|1950-01-01|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01369","name":"Boggs Ray L & Byron E"},"object":{"type":"operator","id":"L01535","name":"Boggs Brothers Construction Company"},"validFrom":"1950-01-01","validTo":"1981-11-16","current":false,"derived":true,"evidenceMineId":"4502519","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|L01535|1950-01-01|M01369|1950-01-01|118225"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"L08897","name":"C E Minerals-Combustion Engineering Inc"},"object":{"type":"mine","id":"4502519","name":"Calhoun Mill"},"validFrom":"1981-11-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|L08897|1981-11-17|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"M01375","name":"Asea Brown Boveri Ltd (ABB)"},"object":{"type":"mine","id":"4502519","name":"Calhoun Mill"},"validFrom":"1981-11-17","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|M01375|1981-11-17|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"M01375","name":"Asea Brown Boveri Ltd (ABB)"},"object":{"type":"operator","id":"L08897","name":"C E Minerals-Combustion Engineering Inc"},"validFrom":"1981-11-17","validTo":null,"current":true,"derived":true,"evidenceMineId":"4502519","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"4502519|L08897|1981-11-17|M01375|1981-11-17|118282"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"4502519","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"}}