{"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":"0103518","name":"McCord Limestone Quarry"},"operator":{"type":"operator","id":"0155414","name":"North Alabama Materials, Inc."},"controller":{"type":"controller","id":"0159401","name":"Darrin K  Isbell"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-13T11:19:05.459773+00:00"}},"edges":[{"type":"operator_operates_mine","subject":{"type":"operator","id":"0155414","name":"North Alabama Materials, Inc."},"object":{"type":"mine","id":"0103518","name":"McCord Limestone Quarry"},"validFrom":"2018-01-31","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0103518|0155414|2018-01-31|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0138703","name":"Brian K  McCord"},"object":{"type":"mine","id":"0103518","name":"McCord Limestone Quarry"},"validFrom":"2018-01-31","validTo":"2020-11-29","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0103518|0138703|2018-01-31|2020-11-29"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0138703","name":"Brian K  McCord"},"object":{"type":"operator","id":"0155414","name":"North Alabama Materials, Inc."},"validFrom":"2018-01-31","validTo":"2020-11-29","current":false,"derived":true,"evidenceMineId":"0103518","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0103518|0155414|2018-01-31|0138703|2018-01-31|28045"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"0159401","name":"Darrin K  Isbell"},"object":{"type":"mine","id":"0103518","name":"McCord Limestone Quarry"},"validFrom":"2020-11-30","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0103518|0159401|2020-11-30|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"0159401","name":"Darrin K  Isbell"},"object":{"type":"operator","id":"0155414","name":"North Alabama Materials, Inc."},"validFrom":"2020-11-30","validTo":null,"current":true,"derived":true,"evidenceMineId":"0103518","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-13T11:19:05.459773+00:00","recordKey":"0103518|0155414|2018-01-31|0159401|2020-11-30|33106"}}],"coverage":{"historyRecords":2,"edgeCount":5,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"0103518","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"}}