{"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":"1509866","name":"Pegs Branch No 30 Mine (A)"},"operator":{"type":"operator","id":"P22274","name":"Stone Mining Company"},"controller":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"source":{"datasetId":"msha-mines","observedAt":"2026-10-17T05:35:58.500035+00:00"}},"edges":[{"type":"controller_controls_mine","subject":{"type":"controller","id":"C00230","name":"Pittston Company"},"object":{"type":"mine","id":"1509866","name":"Pegs Branch No 30 Mine (A)"},"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":"1509866|C00230|1950-01-01|"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P01035","name":"Eastern Coal Corp"},"object":{"type":"mine","id":"1509866","name":"Pegs Branch No 30 Mine (A)"},"validFrom":"1976-08-05","validTo":"1993-02-22","current":false,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1509866|P01035|1976-08-05|1993-02-22"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C00230","name":"Pittston Company"},"object":{"type":"operator","id":"P01035","name":"Eastern Coal Corp"},"validFrom":"1976-08-05","validTo":"1993-02-22","current":false,"derived":true,"evidenceMineId":"1509866","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1509866|P01035|1976-08-05|C00230|1950-01-01|45038"}},{"type":"operator_operates_mine","subject":{"type":"operator","id":"P22274","name":"Stone Mining Company"},"object":{"type":"mine","id":"1509866","name":"Pegs Branch No 30 Mine (A)"},"validFrom":"1993-02-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1509866|P22274|1993-02-23|"}},{"type":"controller_controls_mine","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"mine","id":"1509866","name":"Pegs Branch No 30 Mine (A)"},"validFrom":"1993-02-23","validTo":null,"current":true,"derived":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1509866|C02508|1993-02-23|"}},{"type":"controller_controls_operator","subject":{"type":"controller","id":"C02508","name":"Massey Energy Company"},"object":{"type":"operator","id":"P22274","name":"Stone Mining Company"},"validFrom":"1993-02-23","validTo":null,"current":true,"derived":true,"evidenceMineId":"1509866","intervalAnomaly":false,"source":{"datasetId":"msha-controller-operator-history","observedAt":"2026-10-17T05:35:58.500035+00:00","recordKey":"1509866|P22274|1993-02-23|C02508|1993-02-23|59341"}}],"coverage":{"historyRecords":2,"edgeCount":6,"intervalAnomalies":0,"sourceDatasetId":"msha-controller-operator-history"}},"meta":{"mineId":"1509866","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"}}